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Atestace Chirurgie - independent surgical foundations study materials
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Atestace Chirurgie - independent surgical foundations practice questions

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Question 1Visceral surgery: inflammatory, obstructive and biliary disease

A 48-year-old female presents with a 6-day history of right lower quadrant abdominal pain, fever (38.8°C), and palpable right iliac fossa fullness. She is hemodynamically stable without diffuse peritonitis. Contrast-enhanced CT reveals a perforated retrocecal appendicitis with a well-defined 5.2 cm fluid collection (abscess) containing gas bubbles, walled off by the cecum and terminal ileum. What is the most appropriate initial management strategy according to WSES guidelines?

  1. Immediate emergency open right hemicolectomy with end ileostomy
  2. Percutaneous image-guided catheter drainage combined with intravenous broad-spectrum antibiotics, followed by optional interval appendectomy Correct answer.
  3. Emergency diagnostic laparoscopy with extensive blunt dissection of the inflammatory mass to perform appendectomy
  4. Immediate colonoscopic transcecal stent placement into the abscess cavity

Explanation

For complicated acute appendicitis presenting with a well-circumscribed abscess >3–4 cm (appendiceal phlegmon/abscess) in a hemodynamically stable patient without generalized peritonitis, initial nonoperative management with image-guided percutaneous drainage and broad-spectrum intravenous antibiotics is recommended. Immediate surgery in the setting of severe localized inflammatory phlegmon is associated with high morbidity, extensive tissue tearing, and a significantly higher rate of unintended ileocecal resection.

Question 2Visceral surgery: inflammatory, obstructive and biliary disease

An 81-year-old woman with a history of recurrent biliary colic presents with vomiting, crampy abdominal pain, and abdominal distension. Abdominal CT demonstrates small bowel obstruction with dilated jejunal loops, air within the intrahepatic biliary tree (pneumobilia), and a 3.5 cm calcified intraluminal mass lodged in the terminal ileum. What is the most appropriate emergency operative procedure?

  1. Enterolithotomy alone via longitudinal enterotomy proximal to the stone with transverse closure Correct answer.
  2. Emergency one-stage enterolithotomy, cholecystectomy, and cholecystoduodenal fistula takedown
  3. Right hemicolectomy with primary ileocolic anastomosis
  4. Endoscopic laser lithotripsy through retrograde colonoscopy

Explanation

This patient has gallstone ileus with classic Rigler's triad (pneumobilia, mechanical small bowel obstruction, and an ectopic gallstone in the terminal ileum). In elderly, often fragile patients, the standard emergency operation of choice is enterolithotomy alone: a longitudinal enterotomy is made in healthy bowel proximal to the impacted stone, the stone is extracted, and the bowel is closed transversely to prevent luminal narrowing. Attempting simultaneous one-stage cholecystectomy and fistula takedown in the emergency setting significantly increases operative time, morbidity, and mortality.

Question 3Visceral surgery: inflammatory, obstructive and biliary disease

A 62-year-old male presents with left lower quadrant abdominal pain, localized guarding, and fever (38.5°C). Contrast-enhanced abdominal CT confirms acute sigmoid diverticulitis with a 5.5 cm well-circumscribed fluid and gas collection in the pelvis (Hinchey stage II abscess). He is hemodynamically stable without generalized peritonitis. What is the recommended management according to WSES and EAES guidelines?

  1. Emergency Hartmann procedure with open sigmoid resection and end colostomy
  2. Immediate colonoscopy to irrigate and drain the diverticular orifice
  3. Elective sigmoid resection after 6 months of continuous oral antibiotic therapy
  4. Percutaneous CT-guided catheter drainage combined with intravenous broad-spectrum antibiotic therapy Correct answer.

Explanation

According to the modified Hinchey classification, a distant pelvic or retroperitoneal abscess >3–4 cm corresponds to Hinchey II diverticulitis. In a hemodynamically stable patient without generalized peritonitis, image-guided (CT or ultrasound) percutaneous drainage combined with intravenous antibiotics is the preferred first-line treatment. This allows source control and sepsis resolution, often converting an emergency operation into a safe, elective single-stage laparoscopic sigmoid resection at a later date.

Question 4Visceral surgery: inflammatory, obstructive and biliary disease

A 55-year-old female who underwent an open appendectomy 10 years ago presents with vomiting, crampy abdominal pain, and obstipation. Abdominal CT demonstrates dilated small bowel loops transitioning to collapsed distal ileum, with a 'whirl sign' of mesenteric twisting, localized bowel wall thickening (5 mm), poor mural enhancement, and free fluid in the pelvis. Her pulse is 115 bpm, temperature is 38.2°C, and WBC count is 17.5 × 10^9/L. What is the definitive management?

  1. Placement of a nasogastric tube and conservative observation for 72 hours
  2. Administration of a high-volume polyethylene glycol bowel lavage solution
  3. Immediate emergency exploratory laparotomy for strangulated closed-loop small bowel obstruction Correct answer.
  4. Colonoscopy with decompression tube insertion through the ileocecal valve

Explanation

This patient exhibits classic features of a strangulated / closed-loop small bowel obstruction (fever, tachycardia, leukocytosis, mesenteric whirl sign, focal wall thickening, and diminished enhancement on CT). Strangulation causes rapid venous infarction and gangrene, carrying a high risk of perforation and peritonitis. Immediate surgical exploration (laparotomy/laparoscopy) is mandatory to release the obstructing adhesive band and resect non-viable bowel.

Question 5Visceral surgery: inflammatory, obstructive and biliary disease

A 42-year-old marathon runner presents with acute onset of severe right-sided abdominal pain, distension, and obstipation. Abdominal radiograph and CT scan reveal a massively dilated, comma- or kidney-shaped loop of colon with its apex pointing toward the left upper quadrant, accompanied by collapsed distal colon and small bowel distension. A diagnosis of cecal volvulus is established. What is the definitive management of choice?

  1. Urgent surgical exploration and right hemicolectomy with primary ileocolic anastomosis (or ileostomy if unstable) Correct answer.
  2. Endoscopic colonoscopic detorsion and decompression followed by outpatient follow-up
  3. Placement of a rectal flatus tube and continuous observation for 48 hours
  4. Percutaneous needle decompression of the cecum under local anesthesia

Explanation

Unlike sigmoid volvulus, where endoscopic detorsion is the standard initial bridge therapy, colonoscopic detorsion in cecal volvulus has a very low success rate (<30%) and carries a high risk of perforation and necrosis. Therefore, urgent surgical exploration with right hemicolectomy (ileocecal resection) is the standard definitive treatment. If bowel is viable in a stable patient, primary ileocolic anastomosis is performed; cecopexy alone has unacceptably high recurrence rates.

Question 6Visceral surgery: inflammatory, obstructive and biliary disease

A 76-year-old female presents with recurrent, large-volume, painless hematochezia leading to a drop in hemoglobin from 125 g/L to 72 g/L and transient hypotension responsive to packed red blood cells. Colonoscopy is non-diagnostic due to massive blood and clots throughout the entire colon. CT mesenteric angiography demonstrates active contrast extravasation into a diverticulum in the ascending colon supplied by a branch of the ileocolic artery. What is the preferred next intervention?

  1. Emergency total proctocolectomy with end ileostomy
  2. High-dose intravenous vasopressin infusion without vascular imaging
  3. Superselective transcatheter microcoil embolization of the bleeding ileocolic arterial branch by interventional radiology Correct answer.
  4. Routine blind subtotal colectomy without attempting radiological intervention

Explanation

When CT angiography localizes active lower GI arterial extravasation in a stable or stabilized patient, superselective transcatheter arterial microcoil embolization is the first-line intervention. Superselective technique achieves immediate hemostasis in >85% of cases with a low risk of bowel infarction (<3%), avoiding the high morbidity and mortality of emergency colectomy in elderly patients.

Question 7Visceral surgery: inflammatory, obstructive and biliary disease

A 34-year-old woman with known Crohn's disease of the terminal ileum presents with recurrent postprandial crampy abdominal pain and weight loss. Magnetic resonance enterography (MRE) demonstrates an isolated, fibrotic 6 cm stricture of the neoterminal ileum with upstream dilation (4 cm), but no active mucosal hyperenhancement, fistulas, or intra-abdominal abscess. She has failed multiple biologic therapies. What is the most appropriate surgical treatment?

  1. Limited ileocecal resection (or strictureplasty) with primary anastomosis Correct answer.
  2. Total proctocolectomy with permanent end ileostomy
  3. Extensive small bowel resection removing 100 cm of ileum with wide margins
  4. Side-to-side jejunotransverse colostomy bypass leaving the diseased ileum intact

Explanation

In Crohn's disease, surgery is not curative and should adhere to bowel-preserving principles to prevent short bowel syndrome. For short, isolated, fibrotic terminal ileal strictures without active inflammatory phlegmon or fistula, limited ileocecal resection (or strictureplasty for selected small-bowel strictures) with primary anastomosis is the gold standard. Wide oncologic resection margins offer no benefit in Crohn's disease and increase the risk of intestinal failure.

Question 8Visceral surgery: inflammatory, obstructive and biliary disease

A 39-year-old male presents with severe, throbbing perianal pain and fever. Examination under anesthesia reveals a large ischioanal abscess and an associated high transsphincteric fistula-in-ano traversing the upper two-thirds of the external anal sphincter mechanism. What is the most appropriate surgical management in this acute setting?

  1. Immediate primary lay-open fistulotomy through the entire external sphincter mechanism
  2. Incision and drainage of the abscess with placement of a loose non-cutting draining seton through the fistula tract Correct answer.
  3. Immediate endorectal mucosal advancement flap repair with fibrin glue injection
  4. Immediate loop sigmoid colostomy without perianal drainage

Explanation

In the presence of an acute perianal/ischioanal abscess associated with a high transsphincteric fistula, the standard surgical principle is adequate incision and drainage of the abscess combined with insertion of a loose non-cutting silicone/vessel-loop seton. The seton maintains drainage, prevents recurrent abscess formation, allows the inflammatory process to mature into a clean tract, and preserves sphincter integrity, avoiding severe fecal incontinence. Definitive fistula repair is performed electively weeks later.

Question 9Visceral surgery: inflammatory, obstructive and biliary disease

A 56-year-old male with Child-Pugh Class B cirrhosis and moderate ascites presents with an enlarging, symptomatic umbilical hernia with thinned, ulcerated overlying skin. What is the standard perioperative management strategy to minimize complications and recurrence?

  1. Perform emergency umbilical paracentesis directly through the hernia sac followed by immediate discharge
  2. Optimize ascites medically prior to elective surgery (diuretics, therapeutic paracentesis with albumin or TIPS), followed by elective mesh hernia repair with meticulous skin closure and strict postoperative ascites control Correct answer.
  3. Perform emergency total hepatectomy without ascites control
  4. Instruct the patient to wear a tight mechanical hernia truss continuously for life

Explanation

In cirrhotic patients with umbilical hernias and ascites, uncontrolled ascites leads to skin ulceration, spontaneous rupture ('Flood syndrome'), bacterial peritonitis, and high hernia recurrence. Modern guidelines recommend proactive elective repair once ascites is medically optimized (sodium restriction, spironolactone/furosemide, therapeutic paracentesis with albumin, or TIPS). Elective mesh repair in optimized cirrhotic patients has significantly lower morbidity and mortality than emergency surgery for rupture or strangulation.

Question 10Visceral surgery: inflammatory, obstructive and biliary disease

A 62-year-old female is on postoperative day 6 following an anterior resection with low colorectal anastomosis for rectal cancer. Over the past 12 hours, she has developed new-onset tachycardia (HR 118 bpm), low-grade fever (38.3°C), localized pelvic tenderness, and a sudden rise in serum C-reactive protein (CRP) from 60 mg/L to 240 mg/L. What is the most likely surgical complication, and what is the definitive diagnostic imaging modality of choice?

  1. Superficial wound seroma; plain abdominal X-ray
  2. Urinary tract infection; renal biopsy
  3. Early postoperative pulmonary atelectasis; ventilation-perfusion scan
  4. Colorectal anastomotic leak; contrast-enhanced abdominal and pelvic CT with rectal (water-soluble) and intravenous contrast Correct answer.

Explanation

Colorectal anastomotic leak is the most feared complication of low anterior resection, characteristically presenting between postoperative days 5 and 8 with unexplained tachycardia, fever, elevated inflammatory markers (CRP/procalcitonin), and localized or generalized peritonitis. Contrast-enhanced CT of the abdomen and pelvis with intravenous and water-soluble rectal/intraluminal contrast is the gold-standard diagnostic imaging to detect extraluminal contrast extravasation, pelvic fluid collections, and perianastomotic gas.

Question 11Surgical assessment, trauma and anatomical complications

A 32-year-old male is brought to the trauma resuscitation bay following a high-speed motorcycle crash. He has severe midface fractures, massive intraoral hemorrhage, and severe upper airway stridor. Multiple attempts at endotracheal intubation by the anesthesiologist fail due to complete disruption of the oropharyngeal anatomy and pooling blood. His SpO2 drops to 72% despite bag-valve-mask ventilation. What is the immediate next step in definitive airway management according to ATLS guidelines?

  1. Place a supraglottic laryngeal mask airway (LMA) and observe in the trauma bay
  2. Perform an immediate emergency surgical cricothyroidotomy (scalpel-bougie-tube technique) Correct answer.
  3. Transfer the patient immediately to the radiology department for a maxillofacial CT scan
  4. Perform emergency formal open tracheostomy through the 4th tracheal ring under local anesthesia

Explanation

In a 'cannot intubate, cannot oxygenate' (CICO) scenario in trauma with severe maxillofacial disruption and hemorrhage, emergency surgical cricothyroidotomy (using the scalpel-finger-bougie-tube technique) is the definitive airway procedure of choice. The cricothyroid membrane is easily palpable, subcutaneous, and avascular compared to the lower trachea, allowing rapid establishment of a secure airway within seconds.

Question 12Surgical assessment, trauma and anatomical complications

A 26-year-old male is brought to the resuscitation bay after being stabbed in the right anterior chest. He is tachypneic (respiratory rate 36/min), severely dyspneic, cyanotic, and hypotensive (BP 70/40 mmHg, HR 135 bpm). Examination reveals marked distension of the neck veins, absent breath sounds on the right hemithorax, hyperresonance to percussion on the right, and tracheal deviation to the left. What is the immediate, life-saving next step?

  1. Obtain an immediate portable anteroposterior chest radiograph
  2. Intubate the patient immediately and initiate positive-pressure mechanical ventilation
  3. Perform immediate needle decompression / finger thoracostomy in the 4th/5th intercostal space anterior axillary line, followed by tube thoracostomy Correct answer.
  4. Administer an immediate intravenous bolus of 2 liters of normal saline

Explanation

This patient has a tension pneumothorax, which is a clinical diagnosis requiring immediate emergency decompression before any diagnostic imaging. Positive-pressure air accumulation in the pleural space shifts the mediastinum, kinking the inferior vena cava and reducing venous return to cause obstructive shock. ATLS guidelines recommend immediate pleural decompression (finger thoracostomy or large-bore cannula in the 4th/5th intercostal space anterior to the midaxillary line, or 2nd ICS midclavicular line) followed immediately by formal tube thoracostomy.

Question 13Surgical assessment, trauma and anatomical complications

A 40-year-old male sustains a penetrating gunshot wound to the left lateral hemithorax. In the resuscitation bay, a 32-Fr chest tube is inserted, immediately draining 1,650 mL of dark red blood. Over the subsequent 2 hours in the trauma resuscitation unit, the chest tube continues to drain 250 mL/hour of fresh blood despite ongoing blood transfusion. His systolic blood pressure is 88 mmHg. What is the definitive operative indication?

  1. Clamp the chest tube to allow intrapleural clot formation and tamponade
  2. Instill intrapleural tranexamic acid through the chest tube
  3. Perform serial chest radiographs every hour and continue conservative blood transfusion
  4. Perform an immediate emergency exploratory thoracotomy in the operating room Correct answer.

Explanation

According to ATLS and thoracic trauma guidelines, indications for emergency exploratory thoracotomy in hemothorax include: 1) Initial chest tube drainage of ≥1,500 mL of blood immediately upon insertion, or 2) Persistent ongoing chest tube output of >200 mL/hour for 2 to 4 consecutive hours, or 3) Hemodynamic instability despite active resuscitation. This patient meets both initial and ongoing criteria, indicating major systemic or pulmonary arterial/venous injury requiring surgical source control.

Question 14Surgical assessment, trauma and anatomical complications

A 35-year-old male unrestrained driver is brought to the emergency department after a high-speed motor vehicle collision. On arrival, he is pale and lethargic. Blood pressure is 74/40 mmHg, pulse is 138 bpm. He receives 1 liter of balanced crystalloid with no hemodynamic improvement. A bedside Focused Assessment with Sonography for Trauma (FAST) reveals free fluid in Morrison's pouch (hepatorenal space) and the splenorenal recess. What is the most appropriate next step?

  1. Immediate contrast-enhanced whole-body computed tomography (polytrauma CT)
  2. Diagnostic peritoneal lavage (DPL) to quantify red blood cell count
  3. Immediate transfer to the operating room for exploratory laparotomy Correct answer.
  4. Admission to the intensive care unit for serial hemoglobin monitoring

Explanation

According to ATLS and trauma consensus guidelines, a hemodynamically unstable patient with blunt abdominal trauma and a positive FAST examination (demonstrating hemoperitoneum) has an absolute indication for immediate transfer to the operating room for exploratory laparotomy. CT scanning is strictly contraindicated in hemodynamically unstable patients who fail to respond to initial resuscitation.

Question 15Surgical assessment, trauma and anatomical complications

A 45-year-old female driver sustains blunt hepatic trauma in a frontal motor vehicle crash. Following initial fluid resuscitation, she is hemodynamically stable (BP 118/72 mmHg, HR 88 bpm). Contrast-enhanced CT reveals an AAST Grade IV liver laceration involving segments VI and VII with an active arterial contrast extravasation ('contrast blush') measuring 1.5 cm within the hepatic parenchyma. What is the most appropriate management of the active arterial extravasation?

  1. Transcatheter arterial embolization (TAE / transcatheter hepatic angiography) by interventional radiology Correct answer.
  2. Immediate emergency exploratory laparotomy for formal right hemihepatectomy
  3. Immediate total hepatectomy and emergency liver transplantation listing
  4. Conservative observation with high-dose intravenous tranexamic acid without imaging intervention

Explanation

In hemodynamically stable blunt hepatic trauma with active intrahepatic arterial contrast extravasation ('contrast blush') or traumatic pseudoaneurysms on CT, transcatheter arterial embolization (TAE) is the intervention of choice. TAE selectively occludes bleeding hepatic artery branches with coils or gelfoam, achieving high success rates (>85–95%) while preserving hepatic parenchyma and avoiding major emergency liver resection.

Question 16Surgical assessment, trauma and anatomical complications

A 27-year-old male sustains a stab wound to Zone II of the neck (between the cricoid cartilage and the angle of the mandible). On examination, he has an actively expanding, pulsatile hematoma in the left neck, an audible vascular bruit, and mild stridor. He is hemodynamically stable. According to current Western Trauma Association (WTA) and ATLS guidelines for penetrating neck injuries, what is the mandatory management?

  1. Discharge home with oral antibiotics if a soft tissue neck X-ray is negative
  2. Perform a barium swallow study followed by 24 hours of inpatient observation
  3. Perform elective duplex ultrasound of the carotid vessels in 48 hours
  4. Immediate transfer to the operating room for emergency surgical exploration of the neck Correct answer.

Explanation

Penetrating neck injuries are classified by anatomical zones (Zone I: clavicle to cricoid; Zone II: cricoid to angle of mandible; Zone III: angle of mandible to skull base). Patients presenting with 'hard signs' of vascular or aerodigestive tract injury (such as expanding/pulsatile hematoma, active severe arterial hemorrhage, thrill/bruit, neurological deficit, or airway compromise/stridor) have an absolute indication for immediate emergency surgical exploration in the operating room, regardless of anatomical zone.

Question 17Surgical assessment, trauma and anatomical complications

A 38-year-old female driver is admitted following a severe side-impact motor vehicle collision. Chest radiograph reveals elevation of the left hemidiaphragmatic contour, nasogastric tube curling in the left thoracic cavity, and left lower lung atelectasis. Abdominal and thoracic CT confirms a 7 cm tear in the posterolateral left hemidiaphragm with intrathoracic herniation of the stomach and spleen. In this acute trauma setting, what is the preferred surgical approach and technique for repair?

  1. Right thoracotomy with synthetic polytetrafluoroethylene (PTFE) patch placement
  2. Exploratory laparotomy (transabdominal approach), reduction of herniated viscera, inspection for concomitant intra-abdominal organ injuries, and primary repair of the diaphragmatic defect with interrupted non-absorbable sutures Correct answer.
  3. Closed tube thoracostomy alone, expecting spontaneous closure of the diaphragmatic tear
  4. Median sternotomy with pericardial window creation

Explanation

In acute traumatic diaphragmatic rupture (which occurs on the left side in >75% of cases due to hepatic buffering on the right), the transabdominal approach (exploratory laparotomy or laparoscopy in stable patients) is the gold standard. It allows easy reduction of herniated abdominal organs, direct visualization and repair of frequently associated intra-abdominal visceral/solid organ injuries, and primary closure of the defect with sturdy, interrupted non-absorbable (e.g., polypropylene or braided polyester) sutures. (A transthoracic approach is favored for chronic/delayed presentations).

Question 18Surgical assessment, trauma and anatomical complications

A 21-year-old male sustains blunt upper abdominal trauma after being thrown onto bicycle handlebars. Contrast CT reveals deep parenchymal disruption of the pancreatic body with complete transection of the main pancreatic duct (AAST Grade III pancreatic injury) and a peripancreatic hematoma, without duodenal or major vascular injury. He is hemodynamically stable. What is the surgical procedure of choice?

  1. Total pancreatectomy with splenectomy and Roux-en-Y hepaticojejunostomy
  2. Nonoperative management with oral high-protein diet
  3. Distal pancreatectomy (with or without splenic preservation) and closed-suction drainage Correct answer.
  4. Simple external drain placement over the transected duct without resection

Explanation

In blunt pancreatic trauma, management depends on main pancreatic duct integrity and anatomical location. For distal pancreatic injuries (body and tail) with complete ductal disruption (AAST Grade III), distal pancreatectomy with closed-suction drainage is the gold-standard surgical treatment. Simple drainage of a transected main pancreatic duct invariably leads to persistent high-volume pancreatic fistulas, pseudocysts, and intra-abdominal abscesses.

Question 19Surgical assessment, trauma and anatomical complications

A 56-year-old male is admitted with severe blunt chest trauma. Physical examination reveals a flail chest with paradoxical inward movement of the anterolateral left thoracic wall during inspiration and outward movement during expiration. Arterial blood gas on room air shows pH 7.31, PaCO2 48 mmHg, PaO2 55 mmHg. Chest radiograph confirms fractures of ribs 4 through 8, each broken in two places, with underlying pulmonary contusion. What is the primary initial cornerstone of management?

  1. Immediate external sandbag taping and tight strapping of the chest wall
  2. Immediate bilateral total thoracotomy for wire cerclage of all fractured ribs
  3. High-volume intravenous fluid loading to overcome pulmonary contusion
  4. Multimodal pain control (e.g., thoracic epidural analgesia or paravertebral block), pulmonary toilet, supplemental oxygen, and noninvasive or mechanical positive-pressure ventilation if respiratory failure worsens Correct answer.

Explanation

The primary pathology in flail chest is the underlying pulmonary contusion and severe respiratory splinting due to excruciating pain. The cornerstone of initial management includes aggressive multimodal analgesia (thoracic epidural analgesia, erector spinae plane block, or paravertebral block), aggressive pulmonary toilet, humidified oxygen, and positive-pressure ventilatory support (CPAP/BiPAP or invasive mechanical ventilation) when hypoxemic respiratory failure supervenes. Surgical Stabilization of Rib Fractures (SSRF) is considered for severe chest wall deformity or failure to wean from mechanical ventilation.

Question 20Surgical anatomy, tissue planes and oncological principles

A 22-year-old male undergoes laparoscopy for suspected acute appendicitis. Operative inspection reveals a completely normal appendix, but approximately 60 cm proximal to the ileocecal valve on the antimesenteric border of the ileum, there is an inflamed, blind-ending outpouching measuring 5 cm in length with a thickened, ulcerated base. What is this congenital anomaly, and what is its embryological origin?

  1. Duplication cyst of the ileum; persistence of the embryonic neural crest cells
  2. Urachal diverticulum; failure of obliteration of the allantois
  3. Zenker diverticulum; pulsion herniation through Killian's triangle
  4. Meckel's diverticulum; incomplete obliteration of the vitelline (omphalomesenteric) duct Correct answer.

Explanation

Meckel's diverticulum is the most common congenital gastrointestinal anomaly (approx. 2% of the population, located within 2 feet / 60 cm of the ileocecal valve, approx. 2 inches long, often containing 2 types of heterotopic mucosa: gastric and pancreatic). It results from the failure of complete obliteration of the embryonic vitelline (omphalomesenteric) duct during the 5th–7th weeks of gestation. When symptomatic or acutely inflamed, surgical excision (segmental ileal resection or wedge diverticulectomy) is indicated.

Question 21Surgical anatomy, tissue planes and oncological principles

A 54-year-old female presents with mild dyspepsia. Upper endoscopy and CT scan reveal a well-circumscribed, 4.5 cm submucosal mass along the greater curvature of the gastric body. Endoscopic ultrasound-guided fine-needle biopsy confirms a Gastrointestinal Stromal Tumor (GIST) staining strongly positive for CD117 (c-KIT) and DOG-1, with a mitotic count of 2 per 50 high-power fields (HPFs). There is no evidence of metastatic disease. What is the surgical treatment of choice?

  1. Total gastrectomy with formal D2 lymphadenectomy and splenectomy
  2. Endoscopic mucosal resection with high-dose intra-tumoral ethanol injection
  3. Radical pancreaticoduodenectomy (Whipple procedure)
  4. Complete surgical wedge resection of the stomach with macroscopically and microscopically clear (R0) margins, avoiding tumor pseudocapsule rupture, without routine lymphadenectomy Correct answer.

Explanation

Gastrointestinal Stromal Tumors (GISTs) are mesenchymal tumors driven by activating mutations in KIT or PDGFRA. GISTs rarely spread to regional lymph nodes (<1–2%), so formal radical lymphadenectomy is NOT required. The surgical standard of care for primary resectable gastric GIST is complete wedge resection (open or laparoscopic) achieving negative (R0) margins while strictly avoiding intraoperative rupture of the fragile tumor pseudocapsule, as rupture causes peritoneal sarcomatosis and virtually 100% recurrence.

Question 22Surgical anatomy, tissue planes and oncological principles

During physical examination of a 62-year-old male with a reducible groin hernia, a bulge is palpated protruding directly forward through Hesselbach's triangle. What are the three anatomical boundaries of Hesselbach's triangle, and what type of hernia is this?

  1. Superior: Pectineal ligament; Medial: Femoral vein; Lateral: Inguinal ligament; Femoral hernia
  2. Superior: Iliopubic tract; Medial: Sartorius muscle; Lateral: Rectus abdominis; Indirect hernia
  3. Superior: Psoas muscle; Medial: Vas deferens; Lateral: Testicular vessels; Lumbar hernia
  4. Inferior: Inguinal ligament (Poupart's); Medial: Lateral border of the rectus abdominis muscle; Lateral: Inferior epigastric vessels; Direct inguinal hernia Correct answer.

Explanation

Hesselbach's (inguinal) triangle is the anatomical site through which direct inguinal hernias protrude. Its boundaries are: 1) Inferior: Inguinal ligament, 2) Medial: Lateral border of the rectus abdominis muscle, and 3) Lateral / Superolateral: Inferior epigastric vessels. Direct hernias push directly through the attenuated transversalis fascia in the floor of this triangle, passing medial to the inferior epigastric vessels.

Question 23Surgical anatomy, tissue planes and oncological principles

A 68-year-old woman presents to the surgical clinic with a painful right groin mass that has become increasingly tender over the past 3 days. Ultrasound confirms an incarcerated femoral hernia containing a loop of viable preperitoneal fat. Which anatomical structure forms the medial boundary of the femoral ring, and why is early repair always recommended?

  1. Femoral artery; because of the risk of pseudoaneurysm formation
  2. Inguinal ligament; because of the risk of femoral nerve transection
  3. Lacunar ligament (Gimbernat's ligament); because of the rigid, narrow ring predisposing to a high rate of bowel strangulation Correct answer.
  4. Pectineus muscle; because of the risk of avascular necrosis of the femoral head

Explanation

The femoral ring is bounded anteriorly by the inguinal ligament, laterally by the femoral vein, posteriorly by the pectineal (Cooper's) ligament, and medially by the sharp, crescentic lacunar (Gimbernat's) ligament. Because the boundaries are rigid and fibrous, femoral hernias carry an extremely high risk of strangulation (up to 45%) and should always be repaired surgically without delay once diagnosed.

Question 24Surgical anatomy, tissue planes and oncological principles

A 58-year-old male presents with a large midline ventral incisional hernia (defect width 12 cm, length 18 cm) following an open aortic aneurysm repair 3 years ago. CT shows severe lateral retraction of the rectus abdominis muscles. According to European Hernia Society (EHS) guidelines, what modern abdominal wall reconstruction technique offers the optimal retromuscular plane release, medialization of the rectus complexes, and wide sublay mesh overlap?

  1. Simple primary closure with interrupted silk sutures under maximum tension
  2. Anterior onlay mesh placement directly over the subcutaneous fat without fascial closure
  3. Subcutaneous injection of botulinum toxin alone without any surgical operation
  4. Transversus Abdominis Release (TAR / posterior component separation) with retromuscular sublay placement of a large macroporous polypropylene mesh Correct answer.

Explanation

For complex, large midline incisional hernias (width >10 cm / W3), posterior component separation via Transversus Abdominis Release (TAR) is the gold standard. By incising the posterior lamella of the internal oblique aponeurosis and releasing the transversus abdominis muscle medially to the neurovascular bundles, TAR provides significant medial advancement of the rectus muscles, achieves tension-free midline restoration of the linea alba, and creates an expansive, well-vascularized retromuscular/preperitoneal plane extending from the retroxiphoid space to Cooper's ligaments for wide sublay mesh overlap.

Question 25Surgical anatomy, tissue planes and oncological principles

A 50-year-old female presents with intermittent flushing, watery diarrhea, and crampy mid-abdominal pain. CT scan demonstrates a 2 cm submucosal mass in the terminal ileum with a prominent, stellate, calcified mesenteric mass causing intense desmoplastic retraction and kinking of the adjacent small bowel. Plasma chromogranin A and 24-hour urinary 5-hydroxyindoleacetic acid (5-HIAA) levels are elevated. What is the definitive oncologic surgical procedure?

  1. Transanal local excision of the ileal mass
  2. Total proctocolectomy with end ileostomy
  3. Segmental small bowel resection including the primary tumor with en-bloc regional mesenteric lymphadenectomy down to the origin of the superior mesenteric vessels Correct answer.
  4. Placement of an endoscopic self-expanding metal stent across the ileal lumen without resection

Explanation

Small bowel Neuroendocrine Tumors (NETs / carcinoid tumors), most commonly located in the distal ileum, frequently induce intense local and mesenteric fibrotic/desmoplastic reactions, leading to bowel obstruction, ischemia, and carcinoid syndrome. The curative oncologic operation is segmental small bowel resection with en-bloc radical lymphadenectomy of the corresponding mesentery along the mesenteric vascular arcade down to the root of the superior mesenteric vessels, ensuring complete nodal clearance while preserving vascular supply to the remaining bowel.

Question 26Surgical anatomy, tissue planes and oncological principles

A 45-year-old male who smokes 1 pack of cigarettes per day presents with persistent epigastric pain and melena 1 year after a Roux-en-Y gastric bypass. Upper endoscopy reveals an 8 mm ulceration on the jejunal side of the gastrojejunal anastomosis (marginal ulcer). What are the major risk factors for marginal ulcer development, and what is the primary medical treatment?

  1. Excessive dietary fiber intake; treated with a low-fiber diet and oral magnesium
  2. Cigarette smoking, NSAID use, local ischemia/foreign material (braided non-absorbable sutures), and large gastric pouch size; treated with strict smoking/NSAID cessation and high-dose oral Proton Pump Inhibitor (PPI) therapy Correct answer.
  3. Excessive aerobic exercise; treated with strict bed rest for 3 weeks
  4. Candidal overgrowth; treated with intravenous amphotericin B

Explanation

Marginal ulcers (anastomotic ulcers) develop at or just distal to the gastrojejunal anastomosis after RYGB in up to 5–10% of patients. Primary predisposing factors include cigarette smoking (causing mucosal vasoconstriction), NSAID use (inhibiting protective prostaglandins), mucosal ischemia, foreign bodies (permanent sutures/staples), and large gastric pouches with excess acid production. Primary treatment consists of high-dose PPI therapy (often twice daily for 3 months), sucralfate, H. pylori eradication if present, and strict cessation of smoking and NSAIDs. Surgery is reserved for perforation, severe hemorrhage, or refractory stricture.

Question 27Surgical anatomy, tissue planes and oncological principles

A 38-year-old female presents with a solitary, firm, non-tender 2.2 cm nodule in the right thyroid lobe. Serum TSH is normal (1.8 mIU/L). Ultrasound demonstrates a solid, hypoechoic nodule with smooth borders and absence of microcalcifications. Fine-needle aspiration cytology (FNAC) is reported as Bethesda Category IV (Follicular Neoplasm / Suspicious for Follicular Neoplasm). What is the standard diagnostic and therapeutic surgical recommendation?

  1. Routine total thyroidectomy with prophylactic bilateral central and lateral neck dissection
  2. Conservative observation with repeat ultrasound every 5 years
  3. Diagnostic hemithyroidectomy (lobectomy and isthmusectomy) of the involved right lobe, or molecular testing, to distinguish benign follicular adenoma from invasive follicular carcinoma Correct answer.
  4. Immediate high-dose radioactive iodine (131-I) ablation therapy

Explanation

Bethesda Category IV (Follicular Neoplasm) carries a 25–40% risk of malignancy. Fine-needle aspiration cytology cannot distinguish between a benign follicular adenoma and an invasive follicular thyroid carcinoma, because the diagnosis of malignancy depends strictly on demonstrating capsular invasion or vascular invasion on full histological sectioning. Therefore, diagnostic hemithyroidectomy (lobectomy + isthmusectomy) or diagnostic molecular testing is the standard of care. Routine upfront total thyroidectomy is avoided to spare the patient unnecessary lifelong hormone replacement and bilateral nerve/parathyroid risk if the lesion is benign.

Question 28Surgical anatomy, tissue planes and oncological principles

A 48-year-old female presents with rapid-onset hirsutism, facial plethora, and right flank pain. Abdominal CT reveals a 7.5 cm heterogeneous right adrenal mass with irregular margins, areas of central necrosis, unenhanced attenuation of 38 Hounsfield Units (HU), and delayed contrast washout of 32% (<50%), suspicious for Adrenocortical Carcinoma (ACC). What is the gold-standard surgical approach for suspected localized adrenocortical carcinoma?

  1. Fine-needle aspiration biopsy of the adrenal mass followed by observation
  2. Laparoscopic transperitoneal needle unroofing and cystic drainage
  3. Open en-bloc adrenalectomy with resection of periadrenal fat, regional lymphadenectomy, and en-bloc resection of adjacent invaded structures, strictly avoiding tumor capsule rupture Correct answer.
  4. Percutaneous radiofrequency ablation (RFA) alone

Explanation

For suspected localized Adrenocortical Carcinoma (ACC, suggested by size >4–6 cm, unenhanced CT attenuation >10–20 HU, delayed washout <50%, necrosis, or hormone hypersecretion), open en-bloc adrenalectomy is the gold standard. The surgical objective is complete R0 resection, which requires wide exposure, en-bloc removal of the tumor with surrounding retroperitoneal fat and regional lymph nodes (and adjacent invaded organs like kidney or liver if involved), while strictly avoiding capsular violation or tumor spillage, which causes disastrous peritoneal seeding and recurrence.

Question 29Perioperative physiology, safety and complication assessment

Enhanced Recovery After Surgery (ERAS) pathways have revolutionized perioperative care in elective colorectal and visceral surgery. Which of the following combinations represents key, evidence-based components of an ERAS protocol?

  1. Prolonged preoperative fasting (from midnight for all foods and liquids), routine mechanical bowel preparation without oral antibiotics, and routine peritoneal drain placement
  2. Liberal intraoperative fluid resuscitation (>5 liters crystalloid), bed rest for 5 days postoperatively, and routine postoperative nasogastric tube until bowel movement
  3. Preoperative carbohydrate loading (clear fluid up to 2 hours before induction), multimodal opioid-sparing analgesia, goal-directed fluid management, early oral nutrition, and early mobilization Correct answer.
  4. Mandatory high-dose opioid PCA monotherapy, strict NPO status for 7 days, and prophylactic high-dose sedative infusion

Explanation

Evidence-based ERAS guidelines for elective colorectal surgery emphasize: 1) preoperative counseling and carbohydrate loading up to 2 hours pre-induction, 2) avoidance of prolonged fasting and routine mechanical bowel prep, 3) multimodal opioid-sparing analgesia (e.g., thoracic epidural, TAP blocks, paracetamol, NSAIDs), 4) intraoperative goal-directed fluid therapy avoiding fluid overload, 5) avoidance of routine nasogastric tubes and prophylactic abdominal drains, and 6) early postoperative oral feeding (POD 0/1) and mobilization.

Question 30Perioperative physiology, safety and complication assessment

During a massive intraoperative hemorrhage in a trauma laparotomy, point-of-care Rotational Thromboelastometry (ROTEM) is performed. The EXTEM tracing shows a normal clotting time (CT), but the FIBTEM Maximum Clot Firmness (MCF) is severely reduced at 5 mm (normal >9–10 mm), indicating isolated severe hypofibrinogenemia with poor clot strength. What is the specific, evidence-based targeted hemostatic therapy of choice?

  1. Transfuse 6 units of uncrossed packed red blood cells alone
  2. Administer Fibrinogen concentrate (or Cryoprecipitate) to restore fibrinogen levels and clot firmness Correct answer.
  3. Administer high-dose recombinant activated Factor VIIa immediately
  4. Infuse 3 liters of normal saline to dilute circulating fibrinolytics

Explanation

In viscoelastic testing (ROTEM/TEG), the FIBTEM assay eliminates the platelet component using cytochalasin D, allowing isolated measurement of functional fibrinogen contribution to clot firmness. A FIBTEM MCF <9–10 mm confirms severe hypofibrinogenemia (<1.5–2.0 g/L). According to trauma and European perioperative bleeding guidelines, the first-line targeted therapy is administration of Fibrinogen concentrate (e.g., 2–4 grams) or Cryoprecipitate, rapidly restoring clot stability and reducing transfusion requirements.

Question 31Perioperative physiology, safety and complication assessment

A 60-year-old male with high-output nasogastric drainage following small bowel resection has persistent hypokalemia (serum K+ 2.8 mmol/L). Despite receiving 120 mmol of intravenous potassium chloride over the past 24 hours, his serum potassium remains 2.8 mmol/L. His serum magnesium is checked and found to be 0.40 mmol/L (normal 0.70–1.05 mmol/L). What is the physiological mechanism explaining why hypokalemia cannot be corrected until hypomagnesemia is treated?

  1. Magnesium binds potassium directly in the serum to form insoluble precipitates
  2. Magnesium inhibits renal aldosterone secretion, causing direct potassium retention in the proximal tubule
  3. Magnesium is an essential cofactor for the Na+/K+-ATPase pump and normally exerts an inhibitory effect on renal ROMK potassium secretory channels; hypomagnesemia impairs intracellular potassium uptake and accelerates renal potassium wasting Correct answer.
  4. Hypomagnesemia causes direct hemolysis of red blood cells, releasing intracellular potassium into the urine

Explanation

Magnesium is a vital intracellular cofactor for the Na+/K+-ATPase pump (which pumps potassium into cells) and naturally inhibits the Renal Outer Medullary Potassium (ROMK) channels in the collecting duct. In the presence of hypomagnesemia, this physiological inhibition is lost, leading to unrestricted renal potassium excretion and impaired cellular uptake. Therefore, refractory hypokalemia cannot be corrected until serum magnesium is replenished.

Question 32Perioperative physiology, safety and complication assessment

An 82-year-old female on postoperative day 2 following emergency repair of a strangulated femoral hernia becomes acutely agitated, disoriented to time and place, and visualizes insects on the walls. Her vitals, arterial blood gas, blood glucose, and ECG are normal. She has a Foley catheter in place and is receiving intravenous tramadol and diphenhydramine for itching. What is the diagnosis and evidence-based first-line management?

  1. Acute ischemic stroke; immediate systemic intravenous thrombolysis with alteplase
  2. Primary major depressive disorder; initiate chronic tricyclic antidepressant therapy
  3. Early vascular dementia; transfer to a secure locked psychiatric facility
  4. Postoperative delirium; implement non-pharmacological delirium interventions (reorientation, early mobilization, sleep hygiene, removing unnecessary catheters), discontinue deliriogenic drugs (anticholinergics/opioids), and use low-dose haloperidol only if severe agitation endangers safety Correct answer.

Explanation

The acute fluctuating postoperative confusion is consistent with delirium among the choices. Assess and address contributing illness, medicine effects, pain, sleep, mobility and sensory needs. A drug is not routine treatment for every confused patient; if severe distress or immediate danger persists, qualified care considers indications, contraindications and alternatives. A particular antipsychotic is not appropriate for all neurological or cardiac contexts.

Question 33Perioperative physiology, safety and complication assessment

According to the Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3) and Surviving Sepsis Campaign guidelines, how is Septic Shock clinically defined, and what is the first-line vasopressor of choice to restore perfusion pressure?

  1. Sepsis with persistent hypotension requiring vasopressors to maintain a Mean Arterial Pressure (MAP) ≥65 mmHg AND a serum lactate level >2 mmol/L despite adequate fluid resuscitation; first-line vasopressor is Norepinephrine Correct answer.
  2. Presence of bacteremia on blood cultures without any hypotension; first-line drug is Epinephrine
  3. Isolated fever >38.5°C and leukocytosis; first-line drug is Phenylephrine
  4. Hypotension responsive immediately to 250 mL of saline; first-line drug is Dopamine

Explanation

According to Sepsis-3 guidelines, Septic Shock is defined as a subset of sepsis in which particularly profound circulatory, cellular, and metabolic abnormalities substantially increase mortality. Clinically, it is identified by persistent hypotension requiring vasopressors to maintain MAP ≥65 mmHg and a serum lactate >2 mmol/L (18 mg/dL) despite adequate volume resuscitation (30 mL/kg crystalloids). Norepinephrine is the first-line vasopressor of choice due to potent alpha-1 vasoconstriction with modest beta-1 inotropic support.

Question 34Perioperative physiology, safety and complication assessment

A 45-year-old female undergoes a total thyroidectomy for multinodular goiter. Two hours postoperatively in the PACU, she develops progressive neck swelling, a sense of choking, stridor, and acute respiratory distress. Her neck incision is tense and ecchymotic. What is the immediate, life-saving bedside management?

  1. Administer intravenous nebulized albuterol and wait 30 minutes
  2. Obtain an immediate STAT contrast CT scan of the neck
  3. Transfer the patient to the radiology department for ultrasound-guided needle aspiration
  4. Immediately open the surgical wound at the bedside: remove skin clips/sutures, open the strap muscles, and evacuate the compressive hematoma to relieve airway compression before transfer to the OR Correct answer.

Explanation

Post-thyroidectomy neck hematoma causing acute airway compression is a life-threatening emergency. The primary mechanism of airway compromise is not direct tracheal compression alone, but severe venous and lymphatic congestion causing rapid supraglottic and laryngeal edema. The immediate, life-saving intervention is immediate bedside opening of the incision: release all skin clips/sutures and separate the strap muscles with fingers or scissors to evacuate the hematoma and relieve tension before attempting endotracheal intubation or returning to the operating room for definitive hemostasis.

Question 35Perioperative physiology, safety and complication assessment

A 72-year-old patient who underwent emergency sigmoidectomy for perforated diverticulitis receives 6 liters of 0.9% normal saline during the first 24 hours of resuscitation. Laboratory testing reveals serum sodium 144 mmol/L, chloride 118 mmol/L, potassium 4.2 mmol/L, pH 7.28, and standard base excess -7.5 mEq/L. What is the physiological mechanism of this acid-base disturbance?

  1. Hyperchloremic metabolic acidosis caused by supra-physiological chloride concentrations causing renal bicarbonate excretion. Correct answer.
  2. High anion gap metabolic acidosis driven by unmeasured endogenous ketoacid accumulation.
  3. Primary respiratory acidosis due to acute diaphragm splinting and hypoventilation.
  4. Hypochloremic metabolic alkalosis resulting from excessive gastric hydrochloric acid loss.

Explanation

Normal saline (0.9% NaCl) contains 154 mmol/L of sodium and 154 mmol/L of chloride, which is supraphysiological compared to normal human plasma chloride (98-106 mmol/L). Infusing large volumes of 0.9% saline delivers an excessive chloride load, reducing the strong ion difference (SID), causing renal bicarbonate excretion, renal vasoconstriction, reduced glomerular filtration rate, and normal anion gap hyperchloremic metabolic acidosis. Balanced crystalloids (e.g., Plasmalyte or Ringer's lactate) avoid this phenomenon.

Question 36Perioperative physiology, safety and complication assessment

According to the Clavien-Dindo classification of surgical complications, how is a postoperative event classified if a patient develops an intra-abdominal abscess requiring percutaneous CT-guided drain placement under local anesthesia on postoperative day 6?

  1. Grade I
  2. Grade II
  3. Grade IIIa Correct answer.
  4. Grade IIIb

Explanation

Under the Clavien-Dindo classification, Grade III complications require surgical, endoscopic, or radiological intervention. Specifically, Grade IIIa denotes an intervention performed without general anesthesia (e.g., percutaneous catheter drainage under local anesthesia or sedation), whereas Grade IIIb denotes an intervention requiring general anesthesia (e.g., re-laparotomy).

Question 37Perioperative physiology, safety and complication assessment

On postoperative day 7 following an exploratory laparotomy, a 62-year-old obese diabetic patient reports a sudden 'popping' sensation during a coughing fit, accompanied by a large volume of salmon-pink, serosanguinous fluid soaking through his abdominal dressing. On inspection, the skin sutures have separated and loop of small intestine is visible in the wound base. What is the diagnosis and immediate surgical management?

  1. Superficial wound seroma; compress the wound with elastic bandage and discharge home.
  2. Incisional hernia without dehiscence; reassure the patient and schedule an elective outpatient repair in 6 months.
  3. Complete fascial dehiscence (burst abdomen / Platzbauch); cover with sterile saline-soaked dressings, start IV fluids, and perform urgent operative repair. Correct answer.
  4. Enterocutaneous fistula; immediately insert a large-bore Foley catheter into the wound to occlude the defect.

Explanation

A sudden gush of serosanguinous ('salmon-colored') discharge following a cough, combined with visible bowel loops, is pathognomonic for acute abdominal wound dehiscence with evisceration (burst abdomen / Platzbauch / dehiscence laparotomie). Immediate management requires covering the eviscerated viscera with sterile saline-moistened gauze, keeping the patient on bed rest and NPO, administering IV fluids and broad-spectrum antibiotics, and preparing the patient for emergency operating room re-closure using retention sutures or temporary abdominal closure.

Question 38Perioperative physiology, safety and complication assessment

A 58-year-old male with severe chronic malnutrition (BMI 15.2 kg/m², 18% unintentional weight loss over 3 months) is admitted for obstructing esophageal carcinoma. Total parenteral nutrition (TPN) is started at full caloric goal (35 kcal/kg/day). Within 48 hours, the patient develops profound muscle weakness, confusion, respiratory distress, and ventricular arrhythmias. What is the biochemical hallmark of this condition?

  1. Severe hypophosphatemia, hypokalemia, and hypomagnesemia triggered by insulin-mediated cellular uptake (refeeding syndrome). Correct answer.
  2. Hyperkalemia and hyperphosphatemia due to acute tumor lysis syndrome.
  3. Hypercalcemia of malignancy with suppression of parathyroid hormone.
  4. Isolated severe hyponatremia due to inappropriate antidiuretic hormone secretion (SIADH).

Explanation

Refeeding syndrome occurs when malnourished, catabolic patients receive rapid carbohydrate reintroduction. Glucose infusion stimulates insulin secretion, driving phosphate, potassium, and magnesium into cells for glycolysis and ATP generation. Profound hypophosphatemia impairs diaphragmatic contractility, myocardial function, and oxygen delivery (reduced 2,3-DPG), leading to acute heart failure, arrhythmias, respiratory failure, and death unless calories are restricted and electrolytes are aggressively replenished prior to feeding.

Question 39Perioperative physiology, safety and complication assessment

A 69-year-old male develops a temperature of 38.6°C on postoperative day 1 following an open right hemicolectomy. He has mild tachycardia (96 bpm), oxygen saturation 93% on room air, and coarse crackles at both lung bases. The surgical incision is clean, and the abdomen is soft and non-tender. What is the most common cause of pyrexia at this early postoperative stage?

  1. Surgical site infection with deep fascial necrosis.
  2. Catheter-associated urinary tract infection (CAUTI).
  3. A transient inflammatory response to surgical tissue injury; assess clinically for infection or another complication rather than attributing fever to atelectasis. Correct answer.
  4. Deep vein thrombosis with septic pelvic thrombophlebitis.

Explanation

During the first 24 to 48 hours, fever commonly reflects the cytokine-mediated inflammatory response to surgery. Atelectasis may coexist after abdominal surgery but is not established as the cause of postoperative fever. The patient still needs focused clinical assessment for pulmonary, urinary, wound, drug, thrombotic, or other causes; tests and antibiotics should follow the findings rather than a memorized timing mnemonic.

Question 40Perioperative physiology, safety and complication assessment

A 45-year-old female receiving 2 units of packed red blood cells intraoperatively suddenly develops acute dyspnea, bilateral pulmonary infiltrates on chest radiography, and severe hypoxemia (PaO2/FiO2 = 180) within 3 hours of transfusion initiation. Her central venous pressure and pulmonary capillary wedge pressure are normal, and echocardiography reveals preserved left ventricular systolic function with no evidence of volume overload. What is the diagnosis?

  1. Transfusion-associated circulatory overload (TACO).
  2. Acute hemolytic transfusion reaction (AHTR).
  3. Transfusion-related acute lung injury (TRALI). Correct answer.
  4. Anaphylactic IgA-mediated shock.

Explanation

Transfusion-related acute lung injury (TRALI) is a form of non-cardiogenic pulmonary edema occurring within 6 hours of transfusion, caused by donor anti-HLA or anti-neutrophil antibodies that activate recipient neutrophils in the pulmonary microvasculature. It is characterized by acute hypoxemia (PaO2/FiO2 ≤ 300) and bilateral alveolar infiltrates in the absence of left atrial hypertension or circulatory overload (normal CVP/PCWP, normal cardiac function), distinguishing it from TACO.

Question 41Perioperative physiology, safety and complication assessment

Which of the following cellular and biochemical events characterizes the proliferative phase of normal surgical wound healing (typically occurring between days 4 and 14)?

  1. Platelet degranulation and release of platelet-derived growth factor (PDGF) establishing fibrin clot formation.
  2. Predominance of polymorphonuclear neutrophils clearing necrotic tissue and bacteria.
  3. Fibroblast migration, robust synthesis of type III collagen, and angiogenesis leading to granulation tissue formation. Correct answer.
  4. Covalent cross-linking of type I collagen with reduction of wound vascularity over 12 months.

Explanation

The proliferative phase of wound healing (days 4 to 14) is dominated by fibroblasts and endothelial cells. Fibroblasts migrate into the fibrin scaffold under the influence of PDGF and TGF-beta, actively synthesizing extracellular matrix and type III collagen, while angiogenesis (capillary budding) creates rich granulation tissue. Epithelialization across the wound surface also peaks during this phase.

Question 42Perioperative physiology, safety and complication assessment

Negative pressure wound therapy (NPWT / VAC) is widely utilized for complex surgical wounds and open abdomen management. What is the primary physiological mechanism by which NPWT accelerates wound healing?

  1. Direct eradication of anaerobic bacteria via hyperbaric hyperoxygenation.
  2. Induction of local tissue hypothermia to suppress enzymatic autolysis.
  3. Macro-strain and micro-strain on wound edges, promoting cell proliferation, continuous exudate evacuation, and microvascular perfusion. Correct answer.
  4. Chemical cauterization of exposed wound margins via silver ion oxidation.

Explanation

NPWT exerts both macro-deformation (drawing wound edges together, collapsing wound volume) and micro-deformation (mechanical cellular strain at the foam-wound interface). This mechanical micro-strain stimulates cellular mitosis, protein synthesis, and angiogenesis, while continuous negative pressure removes inhibitory interstitial fluid and metalloproteinases, decreases local tissue edema, and enhances microvascular perfusion.

Question 43Perioperative physiology, safety and complication assessment

According to the World Health Organization (WHO) and Czech SAK Surgical Safety Checklist guidelines, when must the 'Time-Out' phase be performed in the operating room?

  1. Before induction of anesthesia, in the anesthetic holding area.
  2. Immediately prior to patient discharge from the post-anesthesia care unit (PACU).
  3. Immediately before skin incision, with all operating room team members pausing and actively participating. Correct answer.
  4. During surgical wound closure while the surgeon performs the skin suture.

Explanation

The WHO Surgical Safety Checklist comprises three discrete checkpoints: Sign-In (before induction of anesthesia), Time-Out (immediately before skin incision), and Sign-Out (before the patient leaves the operating room). The Time-Out requires the entire team (surgeon, anesthesiologist, scrub nurse, circulator) to pause and confirm patient identity, correct surgical site and side, exact procedure, prophylactic antibiotic administration, and critical operative steps.

Question 44Perioperative physiology, safety and complication assessment

A 52-year-old male with end-stage cirrhosis and alcoholic hepatitis undergoes emergency repair of an incarcerated umbilical hernia. Postoperatively, he exhibits confusion, asterixis, oliguria, and tense ascites. Serum sodium is 122 mmol/L, serum creatinine has risen from 80 µmol/L to 230 µmol/L within 48 hours without proteinuria or hematuria, and urine sodium is < 10 mmol/L. What is the most likely diagnosis?

  1. Acute tubular necrosis (ATN) secondary to aminoglycoside nephrotoxicity.
  2. Post-renal obstructive uropathy due to bilateral ureteral ligation.
  3. Hepatorenal syndrome (HRS-AKI). Correct answer.
  4. Glomerulonephritis with nephrotic syndrome.

Explanation

Hepatorenal syndrome (HRS-AKI) is a functional renal failure occurring in advanced liver disease with ascites, driven by intense splanchnic arterial vasodilation and compensatory profound renal vasoconstriction. Diagnostic criteria include cirrhosis with ascites, rapid increase in serum creatinine (≥ 26.5 µmol/L within 48 hours or ≥ 50% increase), absence of shock, no response to 2 consecutive days of diuretic withdrawal and albumin expansion (1 g/kg/day), absence of nephrotoxic drugs, and low urinary sodium excretion (< 10-15 mmol/L) with normal urinary sediment.

Question 45Perioperative physiology, safety and complication assessment

For a selected mechanically ventilated patient in sinus rhythm under suitable controlled ventilation, what is the rationale for using appropriately interpreted dynamic measures during goal-directed fluid assessment rather than static filling pressure alone?

  1. Dynamic preload parameters predict fluid responsiveness on the Frank-Starling curve under mechanical ventilation, avoiding both tissue hypoperfusion and hypervolemic interstitial edema. Correct answer.
  2. Dynamic parameters ensure a fixed fluid infusion rate of exactly 15 mL/kg/h throughout the operation.
  3. SVV and PPV reliably indicate systemic vascular resistance in spontaneously breathing, awake patients.
  4. GDFT ensures that central venous pressure is maintained at a supranormal target > 18 mmHg at all times.

Explanation

Dynamic parameters of fluid responsiveness (SVV and PPV) leverage heart-lung interactions induced by positive-pressure mechanical ventilation to assess where the patient's heart operates on the Frank-Starling curve. An SVV or PPV > 12-13% indicates that the heart is on the ascending limb and will increase stroke volume in response to a fluid bolus. Using GDFT avoids both hypovolemic hypoperfusion and fluid overload (which causes bowel edema, impaired anastomotic healing, and pulmonary complications).

Question 46Visceral surgery: inflammatory, obstructive and biliary disease

A 22-year-old previously healthy man presents with a 12-hour history of periumbilical pain migrating to the right iliac fossa, anorexia, nausea, and low-grade fever (37.8°C). Physical examination reveals tenderness and voluntary guarding at McBurney's point, with positive Rovsing's and psoas signs. His Alvarado score is calculated as 8. According to European Association for Endoscopic Surgery (EAES) and Czech guidelines, what is the most appropriate next step?

  1. Perform an immediate diagnostic barium swallow with small bowel follow-through.
  2. Discharge the patient with a 10-day course of oral metronidazole and re-evaluate if pain worsens.
  3. Proceed directly to early laparoscopic appendectomy, with ultrasound indicated if the clinical diagnosis is equivocal. Correct answer.
  4. Perform a mandatory contrast-enhanced colonoscopy to inspect the appendiceal orifice.

Explanation

In young male patients, an Alvarado score of 8 (or high AIR score) represents a high clinical probability of acute appendicitis. EAES and Czech surgical guidelines recommend proceeding to early laparoscopic appendectomy. Preoperative imaging (ultrasound or low-dose CT) is useful to reduce negative appendectomy rates in equivocal presentations or in female patients of childbearing age, but in high-probability young men, prompt laparoscopic exploration is definitive.

Question 47Visceral surgery: inflammatory, obstructive and biliary disease

During a laparoscopic appendectomy for suppurative non-perforated appendicitis, the mesoappendix has been skeletonized. Which method of securing the appendiceal base provides optimal safety, minimal operative time, and cost-effectiveness according to evidence-based surgical literature?

  1. Inversion of the appendiceal stump into the cecum with a purse-string seromuscular suture, mirroring traditional open technique.
  2. Routine application of an endoscopic linear stapler (Endo-GIA) across the cecal wall regardless of base condition.
  3. Simple closure of the healthy appendiceal base with polymeric/titanium clips or pre-tied loop ligatures (Endoloop). Correct answer.
  4. Leaving the appendiceal stump open without ligation to prevent mucocele formation.

Explanation

For an uncomplicated appendiceal base of normal diameter without cecal involvement, secure ligation using polymeric non-absorbable clips (e.g., Hem-o-lok) or pre-tied loop ligatures (Endoloop) is safe, reliable, and significantly more cost-effective than endoscopic linear staplers. Routine inversion of the stump is unnecessary in laparoscopic surgery and risks intramural abscess formation and cecal hematoma.

Question 48Visceral surgery: inflammatory, obstructive and biliary disease

According to the Tokyo Guidelines 2018 (TG18) for acute cholecystitis, which triad of criteria establishes a definitive diagnosis?

  1. A: Local signs of inflammation (Murphy's sign, RUQ mass/pain) + B: Systemic signs of inflammation (fever, elevated CRP/WBC) + C: Imaging findings characteristic of acute cholecystitis. Correct answer.
  2. A: Elevated serum amylase > 3x ULN + B: Conjugated hyperbilirubinemia > 100 µmol/L + C: Dilated main pancreatic duct.
  3. A: Epigastric pain radiating to back + B: Elevated ALT/AST > 1000 IU/L + C: Free air under the diaphragm.
  4. A: Intermittent biliary colic + B: Presence of asymptomatic cholelithiasis + C: Normal inflammatory markers.

Explanation

Under the Tokyo Guidelines 2018 (TG18), a definitive diagnosis of acute cholecystitis requires fulfillment of three criteria: (A) Local signs of inflammation (positive Murphy's sign, right upper quadrant pain/tenderness/mass); (B) Systemic signs of inflammation (fever, elevated CRP, elevated WBC count); and (C) Imaging findings characteristic of acute cholecystitis on ultrasound, CT, or MRI (gallbladder wall thickening ≥ 4 mm, pericholecystic fluid, sonographic Murphy's sign, gallstones/debris).

Question 49Visceral surgery: inflammatory, obstructive and biliary disease

A 61-year-old male presents with acute cholecystitis. He has had continuous right upper quadrant pain for 48 hours, temperature 38.4°C, WBC 19,200/µL, and a palpable tender mass in the right upper quadrant. His creatinine, platelets, INR, and arterial blood gas are normal. How is this patient classified under Tokyo Guidelines 2018 (TG18), and what is the recommended surgical management?

  1. Grade I (Mild); discharge on oral ciprofloxacin and schedule elective surgery in 3 months.
  2. Grade III (Severe); immediate emergency open subtotal cholecystectomy without preoperative antibiotics.
  3. Grade II (Moderate); initiate IV antibiotics and perform early laparoscopic cholecystectomy during the index admission. Correct answer.
  4. Grade II (Moderate); absolute contraindication to laparoscopic surgery; mandatory open conversion before starting.

Explanation

Under TG18, Grade II (Moderate) acute cholecystitis is defined by any one of the following: WBC > 18,000/µL, palpable tender RUQ mass, duration of symptoms > 72 hours, or marked local inflammation (gangrene, emphysematous cholecystitis, biliary peritonitis) without organ failure. TG18 and European guidelines strongly recommend prompt intravenous antibiotics and early laparoscopic cholecystectomy during the index admission by an experienced surgeon.

Question 50Visceral surgery: inflammatory, obstructive and biliary disease

The Critical View of Safety (CVS), introduced by Strasberg, is the universal standard for preventing catastrophic bile duct injury during laparoscopic cholecystectomy. Which of the following describes the three mandatory criteria required to achieve the Critical View of Safety?

  1. 1: Division of the cystic artery first; 2: Identification of the common bile duct; 3: Mobilization of the duodenum.
  2. 1: Routine intraoperative cholangiography; 2: Dissection along the common hepatic duct; 3: Insertion of a T-tube drain.
  3. 1: The hepatocystic triangle is cleared of fat and fibrous tissue; 2: The lower third of the gallbladder is separated from the liver bed; 3: Two and only two structures are seen entering the gallbladder. Correct answer.
  4. 1: Placement of a clip on the infundibulum; 2: Division of the cystic duct; 3: Cauterization of the liver bed.

Explanation

The Strasberg Critical View of Safety (CVS) requires three distinct, verifiable steps before any tubular structure is clipped or divided: (1) The hepatocystic triangle (bounded by cystic duct, common hepatic duct, and inferior liver surface) is cleared of all fat and fibrous tissue; (2) The lower third of the gallbladder is dissected off the cystic plate (liver bed); and (3) Two and only two structures (the cystic duct and cystic artery) are seen entering the gallbladder directly.