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Question 1Internal medicine: physiology, differential diagnosis and clinical priorities

A 71-year-old male with a history of hypertension and type 2 diabetes mellitus presents with palpitations. An ECG confirms newly diagnosed atrial fibrillation with a ventricular response of 115 bpm. He has no prior history of stroke, TIA, or vascular disease. Echocardiography shows preserved left ventricular systolic function and no significant valvular disease. Blood pressure is 138/82 mmHg. What is his CHA2DS2-VASc score, and what is the recommended long-term antithrombotic management?

  1. CHA2DS2-VASc = 1; prescribe low-dose aspirin 100 mg daily
  2. CHA2DS2-VASc = 2; dual antiplatelet therapy with aspirin and clopidogrel for 12 months
  3. CHA2DS2-VASc = 3; oral anticoagulation with a direct oral anticoagulant (DOAC, e.g., apixaban, edoxaban, or rivaroxaban) as preferred first-line therapy Correct answer.
  4. CHA2DS2-VASc = 4; therapeutic intravenous unfractionated heparin bridging followed by lifelong vitamin K antagonist (warfarin/phenprocoumon) with target INR 3.0–4.0

Explanation

The CHA2DS2-VASc score assigns 1 point for Hypertension, 1 point for Diabetes mellitus, and 1 point for Age 65–74 years, totaling 3 points. In men with a CHA2DS2-VASc score ≥2 (and women ≥3), oral anticoagulation is strongly recommended (Class I) to prevent thromboembolic stroke. Direct oral anticoagulants (DOACs) are preferred over vitamin K antagonists due to lower intracranial hemorrhage rates and similar or superior efficacy.

Question 2Internal medicine: physiology, differential diagnosis and clinical priorities

A 31-year-old female presents with chronic bloating, recurrent loose stools, fatigue, and an itchy vesicular rash on the extensor surfaces of both elbows and knees (dermatitis herpetiformis). Laboratory investigation reveals microcytic iron-deficiency anemia refractory to oral iron supplementation. She is currently consuming a regular gluten-containing diet. What is the recommended initial serological screening approach for celiac disease in adults?

  1. Serum anti-gliadin IgG antibodies alone
  2. Fecal occult blood test (FIT) and serum HLA-DQ2/DQ8 genetic testing
  3. Serum anti-Saccharomyces cerevisiae antibodies (ASCA)
  4. Serum IgA anti-tissue transglutaminase (tTG-IgA) antibody testing combined with total serum IgA measurement to exclude selective IgA deficiency Correct answer.

Explanation

The gold-standard initial serological screening for celiac disease (gluten-sensitive enteropathy) in patients on a gluten-containing diet is serum IgA anti-tissue transglutaminase (tTG-IgA) combined with total serum IgA quantification. Total IgA is measured because selective IgA deficiency is 10- to 15-fold more common in celiac patients; if total IgA is deficient, IgG-based tests (e.g., IgG anti-deamidated gliadin peptides or IgG tTG) must be used.

Question 3Internal medicine: physiology, differential diagnosis and clinical priorities

A 46-year-old woman presents with resistant hypertension, new-onset type 2 diabetes mellitus, facial fullness ('moon facies'), dorsocervical fat pad ('buffalo hump'), proximal muscle weakness, and prominent broad violaceous abdominal striae (>1 cm wide). She denies taking exogenous glucocorticoids or herbal supplements. According to Endocrine Society guidelines, which test is recommended as an initial first-line screening investigation for suspected hypercortisolism (Cushing's syndrome)?

  1. Single random morning serum cortisol measurement
  2. Serum ACTH level measurement alone
  3. Pituitary MRI and adrenal CT scan prior to any biochemical testing
  4. 1 mg overnight low-dose dexamethasone suppression test (DST), 24-hour urinary free cortisol (UFC), or late-night salivary cortisol (at least two concordant tests) Correct answer.

Explanation

First-line screening for endogenous Cushing's syndrome requires biochemical demonstration of hypercortisolism using at least two of the following tests: 1) 1 mg overnight dexamethasone suppression test (post-dexamethasone morning cortisol >50 nmol/L or 1.8 ug/dL); 2) 24-hour urinary free cortisol (at least two collections); or 3) late-night salivary cortisol. A single random serum cortisol is non-diagnostic due to physiological diurnal variability.

Question 4Internal medicine: physiology, differential diagnosis and clinical priorities

A 44-year-old male is evaluated for refractory hypertension (BP 168/102 mmHg) despite adherence to a triple antihypertensive regimen consisting of amlodipine, ramipril, and indapamide. Routine serum biochemistry reveals: serum sodium 144 mmol/L, serum potassium 3.1 mmol/L (persistent unprovoked hypokalemia), and serum bicarbonate 30 mmol/L. What is the recommended initial screening test for primary hyperaldosteronism (Conn's syndrome)?

  1. Plasma aldosterone concentration to plasma renin activity (or direct renin concentration) ratio (ARR) Correct answer.
  2. 24-hour urinary metanephrines and normetanephrines collection
  3. Renal artery duplex ultrasonography and captopril renography
  4. Adrenal venous sampling (AVS) performed as the initial screening test

Explanation

The screening test of choice for primary aldosteronism (Conn syndrome) in patients with resistant hypertension and unprovoked hypokalemia is the aldosterone-to-renin ratio (ARR). An elevated ARR (e.g., >20–30 ng/dL per ng/mL/h) in the presence of an elevated plasma aldosterone concentration (>15 ng/dL or 416 pmol/L) indicates autonomous aldosterone secretion. Confirmatory testing (saline infusion or fludrocortisone suppression) is done before CT/AVS.

Question 5Internal medicine: physiology, differential diagnosis and clinical priorities

A 28-year-old female presents with chronic fatigue, brittle nails, and craving for ice (pagophagia). Complete blood count reveals: Hb 92 g/L, MCV 68 fL (microcytic), MCH 22 pg, RDW 18.5% (elevated), WBC 6.2 x 10^9/L, and platelets 420 x 10^9/L. What laboratory finding definitively confirms iron deficiency anemia as the underlying cause, distinguishing it from beta-thalassemia trait?

  1. Normal serum ferritin >100 ug/L with elevated hemoglobin A2 (>3.5%) on hemoglobin electrophoresis
  2. Markedly decreased serum ferritin (<30 ug/L), low transferrin saturation (<15–20%), and elevated total iron-binding capacity (TIBC) Correct answer.
  3. Elevated serum ferritin, low TIBC, and elevated serum soluble transferrin receptor level
  4. Positive direct antiglobulin test (Coombs test) and elevated serum unconjugated bilirubin

Explanation

Serum ferritin is the most sensitive and specific biomarker for evaluating iron stores. A serum ferritin level <30 ug/L in non-inflammatory states confirms iron deficiency anemia. Hallmarks include: low ferritin, high total iron-binding capacity (TIBC/transferrin), low transferrin saturation (<15–20%), high RDW, and microcytic hypochromic indices. In beta-thalassemia trait, ferritin is normal/elevated, RDW is typically normal, and HbA2 is elevated (>3.5%).

Question 6Surgical assessment, trauma and anatomical complications

A 68-year-old male presents to the emergency room with severe, agonizing right groin pain that began 4 hours ago. He has a known history of a reducible right inguinal hernia for 3 years. On examination, there is a tense, firm, exquisitely tender, non-reducible swelling in the right groin with overlying skin erythema. The patient is tachycardic (HR 112 bpm), febrile (38.3°C), and vomiting. What is the immediate, definitive clinical management?

  1. Immediate emergency surgical exploration and hernia repair (herniorrhaphy/hernioplasty) with bowel viability assessment, without attempting forceful manual reduction (taxis) Correct answer.
  2. Application of forceful manual pressure (taxis) in the Trendelenburg position after administering high-dose IV opioids
  3. Immediate outpatient discharge with an elastic groin truss and routine surgical clinic follow-up in 2 weeks
  4. Prescription of oral antibiotics and an outpatient elective ultrasound appointment

Explanation

The patient exhibits signs of a strangulated inguinal hernia (irreducible, tense, exquisitely tender mass with overlying erythema, tachycardia, fever, and vomiting, indicating compromised bowel perfusion and potential necrosis). Forceful manual reduction (taxis) is strictly contraindicated because of the risk of 'reduction en masse' or reducing gangrenous, perforated bowel into the peritoneal cavity. Immediate emergency surgical exploration is mandatory to inspect bowel viability and repair the defect.

Question 7Surgical assessment, trauma and anatomical complications

A 21-year-old male presents with acute periumbilical pain that migrated to the right lower quadrant over 12 hours, accompanied by anorexia, low-grade fever (38.1°C), localized tenderness at McBurney's point, positive Rovsing sign, and positive psoas sign. White blood cell count is 14,200/μL with 82% neutrophils. What is the clinical diagnosis and definitive management?

  1. Acute appendicitis; Prompt appendectomy (laparoscopic or open) and perioperative intravenous antibiotics Correct answer.
  2. Acute mesenteric adenitis; Conservative observation and oral analgesics without surgical consultation
  3. Right renal colic; Shock-wave lithotripsy on day 1
  4. Acute Crohn disease; High-dose oral infliximab induction

Explanation

Migratory right iliac fossa pain, tenderness at McBurney's point, Rovsing sign (pain in RIF on LIF palpation), psoas sign (pain on right hip extension), and neutrophilic leukocytosis represent the classic clinical presentation of acute appendicitis. Urgent appendectomy is the definitive management to prevent perforation, periappendicular abscess, and generalized peritonitis.

Question 8Surgical assessment, trauma and anatomical complications

A 52-year-old woman with a history of hysterectomy 5 years ago presents with colicky abdominal pain, profuse bilious vomiting, abdominal distension, and complete cessation of bowel movements and gas passage (arrêt des matières et des gaz). Plain abdominal radiograph in upright position reveals multiple central air-fluid levels that are wider than they are tall with visible valvulae conniventes. What is the diagnosis?

  1. Acute mechanical small bowel obstruction secondary to postoperative peritoneal adhesions (brides péritonéales) Correct answer.
  2. Paralytic ileus secondary to hypocalcemia
  3. Colonic obstruction from sigmoid volvulus
  4. Acute mesenteric arterial thrombosis without obstruction

Explanation

The classic tetrad of mechanical small bowel obstruction is colicky pain, vomiting, abdominal distension, and complete cessation of flatus and feces (arrêt des matières et des gaz). Upright plain abdominal radiography showing central, step-ladder air-fluid levels that are wider than tall with mucosal folds traversing the full lumen (valvulae conniventes) confirms small bowel obstruction, most commonly caused by postoperative adhesions/brides.

Question 9Surgical assessment, trauma and anatomical complications

A 65-year-old male with a chronic right groin bulge presents with sudden severe groin pain of 6 hours duration, nausea, and vomiting. Examination reveals an exquisitely tender, tense, non-reducible, non-expansile swelling in the right groin above the inguinal ligament. What is the diagnosis and why is forceful manual taxis strictly contraindicated?

  1. Strangulated inguinal hernia; Forceful reduction risks reducing necrotic bowel into the peritoneal cavity ('réduction en masse') causing fatal peritonitis, requiring emergency surgical exploration Correct answer.
  2. Incarcerated femoral hernia; Forceful manual reduction is the standard conservative treatment
  3. Acute hydrocele of the cord; Elective outpatient needle aspiration is indicated
  4. Inguinal lymphadenitis; Oral antibiotic therapy and warm compresses

Explanation

A strangulated inguinal hernia occurs when intestinal blood supply is compromised by tight constricting fascial rings. Forceful manual reduction (taxis) is absolutely contraindicated because it can cause reduction of gangrenous bowel into the abdominal cavity (réduction en masse) or bowel rupture, leading to generalized fecal peritonitis. Immediate emergency surgical exploration, bowel viability assessment, and hernia repair are mandatory.

Question 10Surgical assessment, trauma and anatomical complications

A 28-year-old motorcyclist is brought to the trauma center following a road traffic collision with blunt abdominal trauma. On arrival: Glasgow Coma Scale is 14, heart rate is 135 bpm, blood pressure is 75/40 mmHg despite 1,500 mL of IV crystalloids, and the abdomen is moderately distended and tender. Focused Assessment with Sonography for Trauma (FAST) reveals massive free fluid in the splenorenal and hepatorenal (Morison) pouches. What is the next immediate management step?

  1. Immediate transfer to the operating room for exploratory emergency laparotomy and initiation of massive transfusion protocol Correct answer.
  2. Transfer to the radiology department for a contrast-enhanced abdominopelvic CT scan
  3. Diagnostic peritoneal lavage (DPL) to confirm the ultrasound findings
  4. Admission to the general surgical ward for serial abdominal examinations

Explanation

In blunt abdominal trauma, hemodynamic instability (hypotension refractory to initial crystalloid resuscitation) combined with a positive FAST ultrasound demonstrating hemoperitoneum is an absolute indication for immediate emergency exploratory laparotomy and activation of the massive transfusion protocol (1:1:1 ratio of PRBC, FFP, and platelets). Sending an unstable trauma patient to the CT scanner is a critical error.

Question 11Surgical assessment, trauma and anatomical complications

A 32-year-old male sustains a closed comminuted fracture of the mid-shaft tibia. Four hours after cast application, he develops severe, unrelenting pain in the lower leg that is disproportionate to the injury and unresponsive to intravenous morphine. Passive dorsiflexion of the toes elicits agonizing pain. The anterior compartment is tense and woody. Distal dorsalis pedis pulses are still palpable. What is the diagnosis and urgent definitive management?

  1. Acute compartment syndrome; Immediate bivalving/removal of the cast and emergency surgical decompressive fasciotomy of all involved compartments Correct answer.
  2. Deep vein thrombosis (DVT); Full therapeutic anticoagulation with low-molecular-weight heparin
  3. Normal post-fracture edema; Elevation of the leg above the heart and increasing opioid dosage
  4. Complex regional pain syndrome; Sympathetic nerve block

Explanation

Acute compartment syndrome occurs when intracompartmental tissue pressure exceeds capillary perfusion pressure within an osteofascial compartment. Pain out of proportion to injury and pain on passive muscle stretch are the earliest and most reliable signs. Palpable distal pulses do NOT rule out compartment syndrome. The definitive treatment is urgent surgical decompressive fasciotomy of all compartments (e.g., 4 compartments in the leg) within 6 hours to prevent irreversible muscle necrosis and nerve palsy.

Question 12Surgical assessment, trauma and anatomical complications

A 22-year-old rugby player sustains an anterior dislocation of the right glenohumeral joint following forced abduction and external rotation. On examination, there is loss of the normal shoulder contour ('epaulette sign'), a vacant glenoid fossa, and the arm is held in slight abduction. Before and after closed reduction, which neurovascular structure must be systematically examined for injury?

  1. Axillary nerve (sensory testing over the regimental badge area of the lateral deltoid and deltoid muscle tone) Correct answer.
  2. Radial nerve (sensory testing of the first dorsal web space and wrist extension)
  3. Ulnar nerve (sensory testing of the fifth finger and finger abduction)
  4. Median nerve (sensory testing of the index finger and thumb opposition)

Explanation

The axillary nerve (circumflex nerve) winds around the surgical neck of the humerus in close proximity to the inferior/anterior capsule of the glenohumeral joint and is injured in up to 10–20% of anterior shoulder dislocations. It must be assessed before and after reduction by testing sensory perception over the lateral deltoid ('regimental badge area') and deltoid contraction.

Question 13Surgical assessment, trauma and anatomical complications

A 78-year-old osteoporotic female falls at home and cannot stand. On physical examination, her right lower extremity is visibly shortened, abducted, and externally rotated. Plain radiographs reveal a displaced intracapsular femoral neck fracture (Garden Stage IV). Why is prosthetic replacement (hemiarthroplasty or total hip arthroplasty) preferred over closed reduction and internal fixation in this elderly patient?

  1. Displaced intracapsular femoral neck fractures disrupt the medial and lateral circumflex femoral retinacular vessels, carrying high rates of femoral head avascular necrosis (AVN) and nonunion with internal fixation Correct answer.
  2. Intracapsular fractures heal with excessive callus formation that blocks the obturator canal
  3. Femoral neck fractures in the elderly are universally malignant metastatic lesions
  4. Internal fixation requires a minimum of 6 months of absolute bed rest

Explanation

The arterial supply to the femoral head runs retrograde through retinacular vessels arising from the medial and lateral circumflex femoral arteries along the femoral neck. In displaced intracapsular fractures (Garden III and IV), these vessels are severed, leading to high rates of avascular necrosis (30–45%) and nonunion if internal fixation is attempted; hip arthroplasty allows immediate full weight-bearing and eliminates AVN risk in elderly patients.

Question 14Surgical assessment, trauma and anatomical complications

A 17-year-old boy is struck in the temporal region by a cricket ball, experiences brief loss of consciousness for 2 minutes, and then awakens feeling completely alert (lucid interval). Three hours later, he develops worsening headache, vomiting, progressive lethargy, and right hemiparesis. Brain CT demonstrates a hyperdense, biconvex (lenticular) extra-axial collection along the left temporoparietal convexity that does not cross cranial suture lines. What is the diagnosis and source of bleeding?

  1. Acute epidural (extradural) hematoma; Rupture of the middle meningeal artery (or its branches) associated with a temporal bone fracture Correct answer.
  2. Acute subdural hematoma; Tearing of bridging cortical veins
  3. Subarachnoid hemorrhage; Rupture of a saccular anterior communicating artery aneurysm
  4. Intracerebral parenchymal hemorrhage; Hypertensive Charcot-Bouchard microaneurysm rupture

Explanation

The classic presentation of an acute epidural hematoma is temporal trauma followed by a 'lucid interval' before rapid deterioration. Non-contrast head CT reveals a characteristic biconvex, lens-shaped hyperdense collection bounded by cranial sutures (where the dura is firmly attached). The source of hemorrhage in >85% of cases is laceration of the middle meningeal artery underneath the pterion.

Question 15Surgical assessment, trauma and anatomical complications

A 15-year-old adolescent boy wakes up at 03:00 AM with sudden, severe right hemiscrotal pain, nausea, and vomiting. Physical examination reveals an exquisitely tender, swollen, high-riding right testis with a transverse lie, absent right cremasteric reflex, and no relief of pain upon manual elevation of the scrotum (negative Prehn sign). What is the diagnosis and the critical therapeutic window for emergency surgical exploration?

  1. Testicular torsion (torsion of the spermatic cord); Emergent bilateral scrotal exploration, detorsion, and bilateral orchidopexy within 6 hours to preserve testicular viability Correct answer.
  2. Acute epididymitis; Outpatient treatment with oral fluoroquinolones for 14 days
  3. Torsion of the appendix testis; Conservative observation with oral NSAIDs
  4. Incarcerated inguinal hernia; Elective daytime ultrasound and delayed clinic review

Explanation

Testicular torsion is a surgical emergency caused by twisting of the spermatic cord with acute ischemia of the testis. Hallmark signs include acute onset, high-riding transverse testis, absent cremasteric reflex, and negative Prehn sign. The critical window for detorsion and orchidopexy is within 6 hours (testicular salvage rate >90%, dropping to <10% after 24 hours). Bilateral orchidopexy is mandatory due to the anatomical 'bell-clapper' deformity predisposing the contralateral side.

Question 16Surgical assessment, trauma and anatomical complications

A 44-year-old obese female presents with a 24-hour history of severe right upper quadrant (RUQ) abdominal pain radiating to the right scapula, low-grade fever (38.3°C), nausea, and anorexia. Palpation of the RUQ produces sharp arrest of deep inspiration (positive Murphy sign). Transabdominal ultrasound demonstrates gallstones, gallbladder wall thickening of 5.5 mm (>4 mm), and pericholecystic fluid halo. What is the diagnosis and standard treatment?

  1. Acute calculous cholecystitis; Intravenous hydration, systemic antibiotics, and early laparoscopic cholecystectomy within 72 hours of admission Correct answer.
  2. Uncomplicated biliary colic; Discharge on oral antispasmodics and low-fat diet
  3. Acute ascending cholangitis; Immediate endoscopic sphincterotomy as sole therapy
  4. Acute hepatitis A; Strict bed rest and oral vitamin supplements

Explanation

The clinical presentation of persistent RUQ pain, positive Murphy sign, fever, and ultrasound findings of cholelithiasis with gallbladder wall thickening (>4 mm) and pericholecystic fluid establishes the diagnosis of acute calculous cholecystitis. Current guidelines recommend early laparoscopic cholecystectomy (ideally within 72 hours of symptom onset) alongside IV antibiotics to prevent gangrene, empyema, and perforation.

Question 17Surgical assessment, trauma and anatomical complications

A 60-year-old male with a history of gallstones presents with the classic Charcot triad: high-spiking fever with chills (39.8°C), right upper quadrant abdominal pain, and overt scleral jaundice. Over the next 4 hours, he develops hypotension (80/50 mmHg) and acute confusion, completing Reynolds' pentad. What is the diagnosis and the essential urgent intervention?

  1. Severe acute obstructive cholangitis (Reynolds' pentad); Immediate aggressive hemodynamic resuscitation, broad-spectrum IV antibiotics, and urgent biliary tract decompression via Endoscopic Retrograde Cholangiopancreatography (ERCP) Correct answer.
  2. Acute fulminant viral hepatitis; High-dose intravenous interferon therapy
  3. Ruptured abdominal aortic aneurysm; Immediate exploratory thoracotomy
  4. Acute mesenteric ischemia; Emergency total colectomy

Explanation

Charcot's triad (fever, jaundice, RUQ pain) plus hypotension and altered mental status constitutes Reynolds' pentad, indicating severe suppurative acute cholangitis (pus under pressure in the biliary tree). This carries near 100% mortality without urgent biliary drainage (via ERCP sphincterotomy/stenting or percutaneous transhepatic drainage) combined with intensive fluid resuscitation and broad-spectrum antibiotics.

Question 18Surgical assessment, trauma and anatomical complications

A 72-year-old male with atrial fibrillation and generalized atherosclerosis presents with severe, unremitting periumbilical abdominal pain of 4 hours duration. On physical examination, the abdomen is soft and non-distended with minimal tenderness, showing striking pain out of proportion to physical findings. Serum lactate is elevated at 4.8 mmol/L. What is the suspected diagnosis and the gold standard imaging modality?

  1. Acute mesenteric ischemia (superior mesenteric artery thromboembolism); Contrast-enhanced CT angiography (CTA) of the abdomen and pelvis Correct answer.
  2. Acute diverticulitis; Plain abdominal radiography without contrast
  3. Chronic peptic ulcer; Barium swallow examination
  4. Irritable bowel syndrome; Outpatient colonoscopy

Explanation

Acute mesenteric ischemia (most commonly SMA embolism from atrial fibrillation) classically presents as severe, acute abdominal pain out of proportion to minimal physical findings in an elderly patient with cardiovascular risk factors. Biphasic contrast-enhanced abdominal CT angiography (CTA) is the gold standard diagnostic test, demonstrating arterial occlusion, lack of bowel wall enhancement, pneumatosis intestinalis, or mesenteric venous gas.

Question 19Surgical assessment, trauma and anatomical complications

A 9-year-old boy presents with high fever (39.2°C), severe localized pain over the distal femoral metaphysis, refusal to bear weight on the right leg, and intense point tenderness on palpation over the bone. Passive knee movement is preserved without joint effusion. Erythrocyte sedimentation rate (ESR) is 75 mm/h and CRP is 92 mg/L. Initial plain radiograph is normal. What is the most likely diagnosis, the predominant causative pathogen, and the initial management?

  1. Acute hematogenous osteomyelitis; Staphylococcus aureus; Blood cultures, urgent MRI (or bone ultrasound), and intravenous antistaphylococcal beta-lactam (e.g., oxacillin/cefazolin or clindamycin) Correct answer.
  2. Osteosarcoma; Immediate surgical limb amputation without biopsy
  3. Growing pains; Reassurance and oral paracetamol as needed
  4. Acute rheumatic fever; Oral aspirin alone without antibiotics

Explanation

Acute hematogenous osteomyelitis in children occurs predominantly in the vascular metaphysis of long bones (distal femur/proximal tibia) and is caused by Staphylococcus aureus in >80% of cases. Early plain radiographs are typically normal for the first 10–14 days before periosteal reaction and lytic bone changes appear. Prompt blood cultures, MRI/ultrasound, and empirical IV antistaphylococcal antibiotics (oxacillin/cefazolin) prevent chronic osteonecrosis and bone sequestration.

Question 20Surgical assessment, trauma and anatomical complications

A 4-year-old child presents with acute left hip pain, high fever (38.8°C), refusal to bear weight (inability to walk), held with the hip in flexion, abduction, and external rotation, and severe pain with any passive range of motion. Laboratory evaluation shows ESR 55 mm/h and WBC 15,400/μL (Kocher criteria 4/4 positive). What is the diagnosis and urgent management?

  1. Septic arthritis of the hip; Immediate ultrasound-guided diagnostic hip joint aspiration and emergency surgical arthrotomy / arthroscopic joint washout Correct answer.
  2. Transient synovitis of the hip; Discharge home on oral ibuprofen and bed rest
  3. Legg-Calvé-Perthes disease; Non-weight-bearing cast for 18 months
  4. Slipped capital femoral epiphysis; Urgent endocrine evaluation alone

Explanation

The Kocher criteria for pediatric septic arthritis include: 1) non-weight bearing, 2) fever >38.5°C, 3) ESR >40 mm/h, and 4) WBC >12,000/μL. Meeting all 4 criteria yields a >99% probability of septic arthritis. The hip is a closed intra-articular space where pus under pressure rapidly destroys cartilage and causes femoral head avascular necrosis; emergency joint aspiration and surgical drainage/washout are mandatory.

Question 21Surgical assessment, trauma and anatomical complications

A 38-year-old male presents with acute, excruciating, spasmodic right flank pain radiating along the inguinal canal to the ipsilateral testicle and inner thigh. He is restless, constantly shifting positions seeking comfort. Urinalysis reveals microscopic hematuria without pyuria. What is the gold standard imaging modality and the first-line analgesic class for acute uncomplicated ureteral colic?

  1. Non-contrast low-dose CT scan of the kidneys, ureters, and bladder (NCCT KUB); Non-steroidal anti-inflammatory drugs (NSAIDs, e.g., IV ketoprofen/ketorolac) Correct answer.
  2. Intravenous urography (IVU); Oral paracetamol monotherapy
  3. Plain abdominal radiograph (KUB) alone; Subcutaneous morphine monotherapy
  4. Renal arteriography; High-dose loop diuretics

Explanation

Non-contrast helical abdominopelvic CT (NCCT KUB) is the gold standard for renal/ureteral colic with >98% sensitivity and specificity, visualizing stone size, location, and secondary hydronephrosis. Intravenous NSAIDs (e.g., ketoprofen, diclofenac) are the first-line analgesics of choice because they directly reduce renal prostaglandins, decreasing renal pelvic pressure, ureteral smooth muscle spasm, and local edema.

Question 22Pediatric reasoning: development, illness severity and age-specific assessment

In a Pediatric Emergency Triage station, you must perform a rapid initial visual assessment of a 14-month-old infant using the Pediatric Assessment Triangle (PAT / Triángulo de Evaluación Pediátrica - TEP). What are the three components evaluated across the triangle's arms, and what is its primary diagnostic purpose?

  1. Appearance (TICLS: Tone, Interactivity, Consolability, Look/Gaze, Speech/Cry), Work of Breathing (abnormal sounds, retractions, flaring), and Circulation to Skin (pallor, mottling, cyanosis); designed to rapidly determine physiological stability and severity category within 30 seconds across across-the-room observation Correct answer.
  2. Blood pressure, capillary glucose, and serum potassium measurement
  3. Complete 12-lead ECG, head CT scan, and lumbar puncture
  4. Weight-for-age, height-for-age, and head circumference plotting alone

Explanation

The Pediatric Assessment Triangle (PAT / TEP) is a rapid visual and auditory across-the-room assessment tool completed within 30 seconds before touching the patient. It evaluates three arms: (1) Appearance (TICLS: Tone, Interactivity, Consolability, Look/gaze, Speech/cry), (2) Work of Breathing (retractions, nasal flaring, grunting, stridor, wheezing), and (3) Circulation to Skin (pallor, mottling, cyanosis). Combining abnormalities categorizes patients into Respiratory Distress, Respiratory Failure, Shock, or CNS/Metabolic Dysfunction.

Question 23Pediatric reasoning: development, illness severity and age-specific assessment

In a well-child physical examination station, you examine the hips of a 2-week-old female infant. How do you correctly perform the Ortolani and Barlow maneuvers for Developmental Dysplasia of the Hip (DDH / Displasia del desarrollo de la cadera), and what is the screening protocol under Chilean GES?

  1. Ortolani: gently abduct the flexed hip while applying anterior pressure to the greater trochanter to reduce a dislocated hip ('palpable clunk of reduction'); Barlow: adduct the flexed hip while applying gentle posterior pressure to see whether it dislocates; in Chile the guaranteed universal imaging screen is an AP pelvic radiograph at 3 months of age Correct answer.
  2. Ortolani and Barlow as described, but the guaranteed universal imaging screen in Chile is a hip ultrasound performed on every infant at 3 months
  3. Ortolani and Barlow maneuvers are strictly contraindicated in infants; only MRI is performed
  4. Both maneuvers involve forceful hyperextension of the knees; no screening exists in Chile

Explanation

In DDH examination: (1) the Ortolani manoeuvre tests whether a dislocated hip reduces - the examiner abducts the flexed hip while pushing the greater trochanter anteriorly, and a palpable 'clunk' confirms reduction into the acetabulum; (2) the Barlow manoeuvre tests whether a located hip dislocates - the examiner adducts the flexed hip while pushing posteriorly. Chile's national screening programme, running since the 1970s and guaranteed through the Examen de Medicina Preventiva and the GES problem Displasia luxante de caderas, is an anteroposterior pelvic radiograph taken at 3 months of age in every infant. Ultrasound is the imaging route for infants under 3 months who have risk factors or an abnormal physical examination, not the universal screen.

Question 24Pediatric reasoning: development, illness severity and age-specific assessment

In an OSCE parent communication station, you counsel the distressed parents of an 18-month-old boy who just recovered completely from a 2-minute simple febrile seizure triggered by acute viral pharyngitis. What key information should you convey to reassure the parents?

  1. Explain that simple febrile seizures are common (~2–5% of children), have an excellent prognosis, do NOT cause brain damage or cognitive impairment, do not mean the child has epilepsy (epilepsy risk is only ~1–2%, similar to baseline population), teach first aid (place on side, do not put objects in mouth), and explain that antipyretics provide comfort but do not prevent seizure recurrence Correct answer.
  2. Tell the parents their child has severe lifelong epilepsy and must never attend school
  3. Advise the parents to put a wooden spoon in the child's mouth during any future convulsion
  4. Prescribe daily oral phenobarbital for 10 years

Explanation

Effective parental counseling after a simple febrile seizure involves: (1) Reassuring that simple febrile seizures do not cause brain injury, intellectual disability, or death, (2) Clarifying that the risk of developing epilepsy is very low (~1–2%, near baseline), (3) Explaining that recurrence risk of another febrile seizure is ~30%, (4) Teaching basic seizure first aid (turn child on side into recovery position, do not restrain, do not insert anything into the mouth, seek emergency care if >5 min), and (5) Explaining antipyretic use for comfort.

Question 25Pediatric reasoning: development, illness severity and age-specific assessment

A fictional calculation supplies an already selected prescription for a 10 kg child: amoxicillin 90 mg/kg/day divided into two doses for 10 days, using suspension 400 mg per 5 mL. Which listed daily dose and rounded volume per dose follow from these supplied inputs? This arithmetic exercise does not establish that regimen for every child with otitis media.

  1. Total daily dose = 900 mg/day (10 kg x 90 mg/kg); administer 450 mg per dose (5.6 mL of 400 mg/5 mL suspension) every 12 hours for 10 days, instructing the mother to complete the full course even if fever resolves earlier Correct answer.
  2. Total daily dose = 100 mg/day; administer 1 mL once weekly
  3. Total daily dose = 5,000 mg/day; administer 30 mL every 4 hours
  4. Do not give any oral liquid; prescribe adult solid tablets crushed in soda

Explanation

Using only the supplied fictional prescription, 10 times 90 equals 900 mg per day. Dividing into two doses gives 450 mg each. The supplied suspension contains 400 divided by 5, or 80 mg per mL, so 450 divided by 80 equals 5.625 mL, rounded to 5.6 mL as listed. The supplied ten-day duration is not inferred as a universal appropriate course for every child.

Question 26Pediatric reasoning: development, illness severity and age-specific assessment

In an infant UTI evaluation station, an uncircumcised 6-month-old male presents with unexplained fever of 39.0 °C. What is the correct sterile technique to obtain a urine specimen for definitive culture and urinalysis, and why are perineal urine collection bags avoided for culture?

  1. Obtain urine via sterile transurethral bladder catheterization (Sondaje vesical transuretral) or suprapubic aspiration; perineal bag specimens have a false-positive culture rate exceeding 80% due to skin flora contamination and cannot be used to confirm a UTI Correct answer.
  2. Collect urine from a disposable diaper by squeezing the cotton padding into a non-sterile cup
  3. Use an unsterile adhesive perineal bag, leave for 6 hours, and treat based on any positive growth
  4. Perform a blind puncture through the lateral flank

Explanation

In non-toilet-trained infants, a valid urine culture must be obtained via sterile urethral catheterization or ultrasound-guided suprapubic aspiration. Perineal urine collection bags (bolsas recolectoras) have a false-positive contamination rate >80% due to periurethral and perineal flora; while a negative bag urinalysis can rule out a UTI, a positive bag culture cannot confirm a diagnosis and leads to inappropriate antibiotic overuse.

Question 27Pediatric reasoning: development, illness severity and age-specific assessment

In an OSCE pediatric cardiology station, a 3-year-old child presents with persistent fever for 6 days, bilateral non-purulent bulbar conjunctivitis, strawberry tongue with cracked lips, polymorphous trunk rash, and unilateral cervical lymph node enlargement. You diagnose Kawasaki disease. What critical imaging study must you order immediately, and what is the primary clinical objective of high-dose IVIG therapy?

  1. Order a Transthoracic Echocardiogram (Ecocardiograma transtorácico) to assess coronary artery dimensions (Z-scores for aneurysm/dilation); administer IVIG (2 g/kg single infusion) within the first 10 days of fever to prevent coronary artery aneurysms Correct answer.
  2. Order a routine abdominal CT scan; IVIG is administered to treat simple dehydration
  3. Order a barium swallow; IVIG is given to treat gastroesophageal reflux
  4. Order an emergency brain biopsy; IVIG is contraindicated in children

Explanation

Kawasaki disease is a systemic vasculitis with predilection for coronary arteries. Transthoracic echocardiography at diagnosis (and repeated at 2 and 6 weeks) evaluates for coronary artery ectasia, dilation, and aneurysms (normalized to body surface area as Z-scores). High-dose IVIG (2 g/kg IV over 10–12 hours) combined with oral aspirin administered within the first 10 days of fever onset drastically reduces the risk of coronary artery aneurysms from 25% down to <4%.

Question 28Pediatric reasoning: development, illness severity and age-specific assessment

During a parent counseling station on acute viral gastroenteritis in an 8-month-old infant, what evidence-based nutritional and pharmacological guidance should you provide regarding feeding and zinc supplementation under WHO and Chilean MINSAL guidelines?

  1. Continue regular age-appropriate feeding and uninterrupted breastfeeding, provide Oral Rehydration Solution for stool losses, prescribe oral Zinc supplementation (20 mg/day for 10–14 days for infants >=6 months) to shorten diarrhea duration and prevent future episodes, and strictly avoid antidiarrheals / antiemetics Correct answer.
  2. Fast the infant with water only for 5 days and prescribe oral loperamide
  3. Switch permanently to soy formula and give adult aspirin for diarrhea
  4. Administer oral metronidazole and stop all breastfeeding for 1 month

Explanation

WHO and MINSAL acute diarrhea management recommendations emphasize: (1) Uninterrupted continuation of breastfeeding and normal feeding (starvation diets cause mucosal atrophy and prolong illness), (2) Replacing losses with low-osmolarity ORS, (3) Oral Zinc supplementation (10 mg/day for infants <6 months, 20 mg/day for children >=6 months for 10–14 days), which regenerates gut mucosa, reduces stool volume, and prevents diarrhea recurrence in the subsequent 3 months, and (4) Avoiding antimotility drugs and antiemetics.

Question 29Pediatric reasoning: development, illness severity and age-specific assessment

In an OSCE breastfeeding counseling station (Consejería en Lactancia Materna), a primiparous mother on postpartum day 4 complains of severe nipple pain during nursing. On observation of a feeding session, what are the key clinical signs of a CORRECT, effective latch (buen acople) to demonstrate and teach the mother?

  1. Infant's mouth wide open with lips flanged outward ('fish lips'), chin firmly touching the breast, nose free, more of the areola visible above the upper lip than below the lower lip (asymmetric latch), cheeks rounded without dimpling, and audible swallowing without smacking sounds Correct answer.
  2. Infant gripping only the tip of the nipple with mouth barely open and cheeks sucked in tightly
  3. Infant nursing exclusively from a plastic bottle while mother pumps once weekly
  4. Instruct the mother to permanently stop breastfeeding immediately

Explanation

Signs of a correct breastfeeding latch (buen acople) under WHO and Chilean Chile Crece Contigo guidelines: (1) Wide open mouth (>120 degrees), (2) Everted lips (both upper and lower lips flanged outward), (3) Chin pressed firmly into the breast, (4) Asymmetric latch (more areola grasped from below, with more areola visible above the upper lip), (5) Rounded cheeks during sucking (no dimpling), and (6) Slow, deep sucks with audible swallowing. Nipple pain usually results from a shallow latch (gripping only the nipple tip).

Question 30Pediatric reasoning: development, illness severity and age-specific assessment

A 16-month-old toddler falls from a 40 cm high couch onto a carpeted floor. He cried immediately, has had no loss of consciousness, no vomiting, is alert and smiling, interacting normally with his parents, and has a normal physical exam with a small 1 cm soft scalp hematoma on the forehead. According to the PECARN (Pediatric Emergency Care Applied Research Network) head injury algorithm for children <2 years, what is the recommended clinical management?

  1. The child meets PECARN Low-Risk criteria (GCS 15, normal mental status, non-severe mechanism, no palpable skull fracture); head CT scan is NOT indicated, and the child can be safely discharged with parental head injury observation instructions Correct answer.
  2. Perform an immediate emergency non-contrast head CT scan and full-body MRI
  3. Admit to pediatric ICU for invasive intracranial pressure monitoring
  4. Perform immediate diagnostic bilateral burr holes

Explanation

The PECARN pediatric head injury prediction rule safely identifies children at very low risk (<0.02%) for clinically important traumatic brain injury (ciTBI), avoiding unnecessary ionizing radiation from head CTs. For children <2 years, low risk is defined by: GCS 15, normal behavior, no palpable skull fracture, no loss of consciousness >5 seconds, non-severe mechanism (<3 feet / 0.9 m fall), and no non-frontal boggy hematoma. Observation at home with parental instructions is the standard of care.

Question 31Pediatric reasoning: development, illness severity and age-specific assessment

In a primary care pediatric consultation station, a mother brings her 18-month-old toddler with moderate Atopic Dermatitis (Dermatitis atópica) presenting with pruritic, erythematous, dry scaling plaques on the cheeks and flexural surfaces of the elbows and knees. What comprehensive skin care regimen and topical therapy should you prescribe and demonstrate?

  1. Daily brief (5–10 min) lukewarm baths with mild syndet (soap-free) cleanser, patting skin dry gently, applying thick emollient ointment/cream (e.g., petrolatum or ceramide cream) liberally within 3 minutes over the entire body ('soak and seal'), applying low-to-medium potency topical corticosteroid (Hydrocortisone 1% or Desonide 0.05%) to active inflamed lesions during flares, and avoiding harsh wool fabrics and fragranced soaps Correct answer.
  2. Hot bubble baths twice daily for 45 minutes and vigorous scrubbing with antibacterial bar soap
  3. Oral systemic prednisone continuously for 12 months without moisturizers
  4. Complete restriction of water bathing for 6 months

Explanation

The foundation of atopic dermatitis management is restoring the defective epidermal skin barrier: (1) Daily brief lukewarm baths using soap-free syndet cleansers, (2) 'Soak and seal' technique: applying liberal fragrance-free emollients (ointments or heavy creams) within 3 minutes of bathing to trap moisture, (3) Short-course topical corticosteroids (e.g., hydrocortisone 1% on face/folds, desonide or mometasone on trunk/limbs) applied to active lesions during flares, and (4) Trigger avoidance (cotton clothing, fragrance-free detergents).

Question 32Obstetric and gynecological assessment and clinical priorities

A 32-year-old G4P3 woman at 35 weeks of gestation presents with sudden onset of severe, unremitting abdominal pain, dark non-clotting vaginal bleeding, and dizziness. On abdominal examination, the uterus is hypertonic, tender, and maintains a persistent 'woody' rigidity (uterus de bois) with absent interval relaxation. Fetal heart tracing shows severe bradycardia (80 bpm). What is the diagnosis and the main differentiating feature from placenta previa?

  1. Placental abruption (Hématome rétro-placentaire / Abruptio placentae); Characterized by painful dark bleeding with hypertonic rigid uterus and fetal distress, whereas placenta previa presents with painless bright red bleeding and a soft, non-tender uterus Correct answer.
  2. Placenta previa; Characterized by severe uterine hypertonicity and uterine rupture
  3. Uterine rupture; Always characterized by painless bleeding and maternal polycythemia
  4. Cervical polyp bleeding; Causing severe fetal bradycardia and hypertonic uterus

Explanation

Placental abruption (hématome rétro-placentaire) presents characteristically with acute severe abdominal/back pain, dark vaginal bleeding (or concealed bleeding), uterine hypertonicity ('woody' uterus / uterus de bois), and rapid fetal distress. In contrast, placenta previa classically presents with recurrent, painless, bright red bleeding with a soft, relaxed, non-tender uterus.

Question 33Obstetric and gynecological assessment and clinical priorities

A 28-year-old G2P1 woman in active labor with a previous lower-segment Cesarean section suddenly cries out with severe abdominal pain during strong oxytocin-augmented contractions. Immediately thereafter, her uterine contractions completely cease, the fetal presenting part recedes from the pelvic inlet, maternal blood pressure drops to 70/40 mmHg, and fetal heart tones become undetectable. What is the diagnosis and urgent management?

  1. Complete uterine rupture (rupture utérine); Immediate maternal resuscitation, emergency laparotomy for delivery of the fetus, and uterine repair or hysterectomy Correct answer.
  2. Normal second stage of labor; Continuation of oxytocin infusion
  3. Amniotic fluid embolism; Immediate administration of high-dose intravenous heparin alone
  4. Precipitous labor; Vacuum extraction delivery at the bedside

Explanation

Uterine rupture in a scarred uterus is a catastrophic obstetric emergency characterized by sudden tearing abdominal pain, sudden cessation of uterine contractions, loss of fetal station (recession of the presenting part on vaginal exam), maternal hypovolemic shock, and fetal distress/demise. Emergency laparotomy is required immediately to control maternal hemorrhage and perform hysterorrhaphy or hysterectomy.

Question 34Obstetric and gynecological assessment and clinical priorities

In an obstetric triage OSCE station, a 34-week pregnant female presents reporting a sudden gush of clear vaginal fluid. In evaluating for Premature Rupture of Membranes (PROM / Rotura Prematura de Membranas - RPM), what is the correct sterile examination technique and confirmatory diagnostic tests to demonstrate?

  1. Perform a sterile speculum examination (avoiding digital vaginal exam) to visualize fluid pooling in the posterior vaginal fornix, test fluid with Nitrazine paper (turns deep blue, pH >6.5), and prepare a dried smear to check for ferning (arborization) under light microscopy Correct answer.
  2. Perform repeated forceful digital vaginal examinations with unsterile gloves every 15 minutes
  3. Perform an immediate emergency exploratory laparotomy before checking for fluid
  4. Discharge the patient with oral antifungal ovules without examining the cervix

Explanation

In suspected PROM: (1) Digital vaginal examination is strictly contraindicated unless delivery is imminent, because digital exams introduce vaginal flora into the cervix and dramatically increase intrauterine infection (chorioamnionitis) and shorten the latency period. (2) Sterile speculum examination is the primary diagnostic modality to: visualize fluid pooling in the posterior fornix, observe leakage from the cervical os with Valsalva maneuver, test fluid pH with Nitrazine paper (amniotic fluid is alkaline pH 7.0–7.5, turning paper blue), and examine dried fluid for microscopic ferning (crystallization).

Question 35Obstetric and gynecological assessment and clinical priorities

During a vaginal delivery of a 4,200 g infant, the fetal head delivers but immediately retracts tightly against the maternal perineum ('turtle sign'), and gentle axial traction fails to deliver the anterior shoulder (Shoulder Dystocia / Distocia de hombros). According to the HELPERR obstetric emergency algorithm, what are the immediate first-line maneuvers to perform?

  1. Call for emergency multidisciplinary assistance, execute the McRoberts maneuver (hyperflexion and abduction of maternal thighs against the maternal abdomen) combined with simultaneous Suprapubic Pressure (Rubin I maneuver), while strictly avoiding maternal fundal pressure Correct answer.
  2. Apply vigorous, forceful downward traction on the fetal head and apply heavy fundal pressure
  3. Perform immediate bilateral episiotomies without repositioning the mother
  4. Administer high-dose oxytocin IV bolus to force delivery

Explanation

Shoulder dystocia occurs when the anterior fetal shoulder impacts behind the maternal pubic symphysis. The ALARM / HELPERR protocol dictates: (1) Call for help and stop pushing, (2) McRoberts maneuver: hyperflexing maternal hips against the abdomen flattens the sacral promontory and rotates the pubic symphysis cephalad, resolving >40% of dystocias, (3) Suprapubic pressure (Rubin I): directed downward and laterally to disimpact the anterior shoulder. Fundal pressure is STRICTLY CONTRAINDICATED as it impacts the shoulder harder and causes uterine rupture and brachial plexus avulsion.

Question 36Obstetric and gynecological assessment and clinical priorities

In an emergency triage station, you evaluate a 33-year-old pregnant female at 35 weeks of gestation who presents with brisk, painless bright red vaginal bleeding. Her vital signs are stable, the uterus is soft and non-tender, and fetal heart rate is 140 bpm with good variability. What is the essential clinical sequence to follow?

  1. Establish IV access, order blood type and crossmatch, perform an emergent Obstetric Ultrasound to determine placental location, and strictly avoid digital vaginal examination until placenta previa is ruled out Correct answer.
  2. Perform immediate digital vaginal exam to palpate the internal os and check cervical dilation
  3. Instruct the patient to go home on bed rest without any ultrasound evaluation
  4. Administer oral misoprostol to induce immediate labor

Explanation

In third-trimester painless bright red vaginal bleeding, placenta previa must be presumed. The critical clinical rules: (1) Digital vaginal examination is strictly contraindicated because digital probing can disrupt the placenta and trigger massive fatal hemorrhage, (2) Establish peripheral IV access and draw blood for type, crossmatch, and CBC, (3) Confirm placental position using transabdominal/transvaginal ultrasound, and (4) Monitor maternal vital signs and continuous electronic fetal heart rate.

Question 37Obstetric and gynecological assessment and clinical priorities

In a gynecology consultation station, you evaluate a 44-year-old female with heavy menstrual bleeding. According to the FIGO PALM-COEIN classification for Abnormal Uterine Bleeding (AUB / Hemorragia Uterina Anormal - HUA), which categories represent structural/anatomical etiologies evaluated by imaging and histopathology?

  1. PALM: Polyp (Pólipo endometrial), Adenomyosis (Adenomiosis), Leiomyoma (Miomatosis uterina), and Malignancy / hyperplasia (Malignidad / hiperplasia endometrial) Correct answer.
  2. PALM: Pain, Anemia, Leukocytosis, and Menopause
  3. COEIN: Coagulopathy, Ovulatory dysfunction, Endometrial, Iatrogenic, and Not otherwise classified
  4. PALM: Pelvic inflammatory disease, Appendicitis, Liver failure, and Mastitis

Explanation

The FIGO system categorizes causes of Abnormal Uterine Bleeding (AUB) in non-pregnant reproductive-age women into: (1) Structural causes (PALM): Polyp, Adenomyosis, Leiomyoma (submucosal vs other), and Malignancy/hyperplasia. (2) Non-structural causes (COEIN): Coagulopathy, Ovulatory dysfunction, Endometrial primary disorders, Iatrogenic (anticoagulants, IUDs, hormones), and Not otherwise classified.

Question 38Obstetric and gynecological assessment and clinical priorities

A 62-year-old multiparous female presents with a sensation of a 'bulge or ball' protruding from her vagina, accompanied by pelvic heaviness that worsens at the end of the day. Pelvic examination confirms a symptomatic Stage II Pelvic Organ Prolapse (Cystocele / Prolapso de pared vaginal anterior). What are the first-line conservative management options to discuss and offer before considering surgical intervention?

  1. Pelvic floor muscle training (Kegel exercises supervised by a physical therapist) and fitting of a Vaginal Pessary (Pesario vaginal) alongside lifestyle modifications (treatment of constipation, weight loss) Correct answer.
  2. Immediate mandatory total pelvic exenteration
  3. Lifelong bed rest and complete fluid restriction
  4. Prescribe high-dose oral estrogen monotherapy without examination

Explanation

First-line management for mild-to-moderate symptomatic pelvic organ prolapse is non-surgical: (1) Supervised Pelvic Floor Muscle Training (PFMT / Kegel exercises) to strengthen the levator ani muscle complex and improve support, (2) Vaginal pessaries (silicone devices such as ring or Gellhorn pessaries fitted in the vagina to support the prolapsed organs), and (3) Lifestyle modifications (managing chronic cough, treating constipation, weight reduction). Reconstructive surgery is reserved for conservative failure or patient preference.

Question 39Neurological and psychiatric clinical reasoning

An 82-year-old female is admitted for elective hip replacement. On postoperative day 2, she becomes acutely confused, disoriented, agitated, fluctuating between somnolence and agitation over hours, with fluctuating attention and visual hallucinations. Using the Confusion Assessment Method (CAM), delirium is diagnosed. What is the essential primary management strategy to demonstrate in this clinical station?

  1. Systematic search for and correction of underlying medical triggers (e.g., urinary retention, constipation, occult infection/UTI, hypoxia, electrolyte imbalance, opioid/sedative polypharmacy) alongside non-pharmacological environmental reorientation Correct answer.
  2. Immediate physical four-point leather restraints and high-dose continuous IV benzodiazepine infusion
  3. Diagnose Alzheimer's dementia and prescribe oral donepezil without checking vitals or labs
  4. Discharge the patient home immediately without medical workup

Explanation

Delirium is an acute neuropsychiatric syndrome characterized by fluctuating attention and cognitive impairment triggered by acute medical conditions. The cornerstone of management is identifying and treating underlying precipitating factors (infection, hypoxia, urinary retention, fecal impaction, electrolyte disturbance, offending medications like sedatives/anticholinergics) and implementing non-pharmacologic interventions (reorientation, early mobilization, sleep hygiene, sensory aids). Restraints and benzodiazepines worsen delirium.

Question 40Neurological and psychiatric clinical reasoning

A 25-year-old male with a history of epilepsy is brought to the resuscitation room experiencing continuous generalized tonic-clonic seizures lasting >15 minutes without recovery of consciousness between episodes. What is the diagnosis and immediate first-line intravenous anticonvulsant of choice (癫痫持续状态首选药物)?

  1. Status Epilepticus; intravenous Diazepam (地西泮静脉注射) Correct answer.
  2. Focal seizure; oral Carbamazepine
  3. Absence status; oral Ethosuximide
  4. Febrile seizure; intravenous Mannitol

Explanation

Status Epilepticus (SE / 癫痫持续状态) is defined as continuous generalized seizure activity lasting >= 5 minutes or recurrent seizures without full interictal neurological recovery. The immediate first-line drug of choice is IV Diazepam (地西泮 10-20 mg at a rate <= 2-5 mg/min) or IV Lorazepam (劳拉西泮), followed by long-acting AEDs (e.g., IV Sodium Valproate or Levetiracetam).

Question 41Neurological and psychiatric clinical reasoning

In a neurosurgical patient with severe traumatic brain injury, which triad of vital sign abnormalities constitutes Cushing's Triad (库欣三联征), indicating critically elevated intracranial pressure and imminent brain herniation?

  1. Hypertension (with widened pulse pressure), Bradycardia, and Irregular/slow respirations (血压升高伴脉压增大、心率减慢、呼吸深慢或不规则) Correct answer.
  2. Hypotension, Tachycardia, and Rapid tachypnea
  3. Hyperthermia, Tachycardia, and Dilated pupils
  4. Hypotension, Bradycardia, and Distended neck veins

Explanation

Cushing's Triad (库欣三联征 / 两慢一高) is a physiological nervous system response to acutely increased intracranial pressure (ICP > 30-40 mmHg) threatening brainstem ischemia: (1) Systemic hypertension with widened pulse pressure (compensatory attempt to maintain cerebral perfusion pressure); (2) Bradycardia (baroreceptor-mediated vagal response); and (3) Irregular/slow bradypnea (brainstem respiratory center compression). Immediate hyperosmolar therapy (Mannitol) and surgical decompression are indicated.

Question 42Clinical anatomy, physiology, pathology and pharmacological mechanisms

In cardiovascular anatomy, which branch of the left coronary artery courses in the anterior interventricular sulcus and supplies the anterior wall of the left ventricle and the anterior two-thirds of the interventricular septum?

  1. Left Anterior Descending artery (LAD / Artère interventriculaire antérieure) Correct answer.
  2. Left circumflex artery (Artère circonflexe)
  3. Right coronary artery (Artère coronaire droite)
  4. Posterior descending artery (Artère interventriculaire postérieure)

Explanation

The Left Anterior Descending (LAD) coronary artery (artère interventriculaire antérieure) arises from the left main coronary trunk, travels down the anterior interventricular groove to the apex, and provides septal branches supplying the anterior two-thirds of the interventricular septum (including the conduction bundle branches) and diagonal branches supplying the anterolateral left ventricular myocardium.

Question 43Clinical anatomy, physiology, pathology and pharmacological mechanisms

The celiac trunk (Tronc cœliaque / Trépied de Haller) is a major anterior branch of the abdominal aorta arising at the level of the T12 vertebra. What are its three classic primary anatomical branches?

  1. Left gastric artery, Splenic artery, and Common hepatic artery Correct answer.
  2. Superior mesenteric artery, Inferior mesenteric artery, and Renal artery
  3. Right gastric artery, Gastroduodenal artery, and Proper hepatic artery
  4. Inferior phrenic artery, Left colic artery, and Ileocolic artery

Explanation

The celiac trunk (Trépied de Haller) arises from the anterior surface of the abdominal aorta immediately below the aortic hiatus at T12 and trifurcates into three primary branches: 1) the Left gastric artery (artère gastrique gauche), 2) the Splenic artery (artère splénique), and 3) the Common hepatic artery (artère hépatique commune), supplying the embryological foregut structures.

Question 44Clinical anatomy, physiology, pathology and pharmacological mechanisms

Regarding the surgical anatomy of the inguinal canal, what structure forms the anterior wall of the canal throughout its entire length, and what landmark distinguishes an indirect inguinal hernia from a direct inguinal hernia?

  1. Aponeurosis of the external oblique muscle; Indirect hernias arise lateral to the inferior epigastric vessels through the deep inguinal ring, whereas direct hernias arise medial to the inferior epigastric vessels in Hesselbach's triangle Correct answer.
  2. Transversalis fascia; Indirect hernias arise medial to the inferior epigastric vessels
  3. Conjoint tendon; Indirect hernias arise through the femoral ring
  4. Inguinal ligament; Direct hernias pass inside the spermatic cord coverings

Explanation

The anterior wall of the inguinal canal is formed along its entire length by the aponeurosis of the external oblique muscle (reinforced laterally by internal oblique fibers). The inferior epigastric vessels are the essential anatomical dividing landmark: indirect inguinal hernias enter the deep inguinal ring lateral to the inferior epigastric vessels, whereas direct inguinal hernias protrude medial to the inferior epigastric vessels through the posterior wall defect in Hesselbach's triangle.

Question 45Clinical anatomy, physiology, pathology and pharmacological mechanisms

In the femoral triangle (Triangle de Scarpa), what are the anatomical boundaries, and what is the exact spatial arrangement of the major neurovascular structures from lateral to medial at the level of the inguinal ligament?

  1. Boundaries: Inguinal ligament (superior), Sartorius muscle (lateral), Adductor longus muscle (medial); Neurovascular arrangement from lateral to medial: Femoral Nerve, Femoral Artery, Femoral Vein, Femoral Canal / Empty space, Lymphatics (NAVEL) Correct answer.
  2. Boundaries: Gracilis (lateral), Rectus femoris (medial), Pectineus (superior); Arrangement: Vein, Artery, Nerve
  3. Boundaries: Iliopsoas (lateral), Sartorius (medial), Inguinal ligament (inferior); Arrangement: Artery, Nerve, Vein
  4. Boundaries: Tensor fasciae latae (lateral), Adductor magnus (medial); Arrangement: Nerve, Vein, Artery

Explanation

The femoral triangle (Scarpa) is bounded superiorly by the inguinal ligament, laterally by the medial border of the sartorius muscle, and medially by the medial border of the adductor longus muscle. The structures passing under the inguinal ligament are organized from lateral to medial according to the classic mnemonic NAVEL: Femoral Nerve, Femoral Artery, Femoral Vein, Empty space (femoral canal), and Lymphatics (Cloquet's node).

Question 46Clinical anatomy, physiology, pathology and pharmacological mechanisms

In hepatic portal circulation anatomy, the portal vein (veine porte) is formed behind the neck of the pancreas by the confluence of which two major venous vessels?

  1. Superior mesenteric vein and Splenic vein Correct answer.
  2. Inferior vena cava and Renal vein
  3. Left gastric vein and Right gastroepiploic vein
  4. Hepatic veins (veines sus-hépatiques) and Celiac vein

Explanation

The portal vein is formed behind the neck (isthmus) of the pancreas at the level of L2 by the confluence of the Superior Mesenteric Vein (bringing venous blood from the small intestine and proximal colon) and the Splenic Vein (which typically receives the Inferior Mesenteric Vein), transporting nutrient-rich blood to the hepatic sinusoids.

Question 47Population health, epidemiology and primary-care continuity

In epidemiological and preventive medicine research, what type of observational study design follows a defined group of disease-free individuals classified by exposure status (exposed vs unexposed) forward in time to determine and compare incidence rates, directly calculating Relative Risk (RR / 相对危险度)?

  1. Prospective Cohort Study (前瞻性队列研究) Correct answer.
  2. Retrospective Case-Control Study (病例对照研究)
  3. Cross-Sectional Prevalence Survey (现况调查 / 横断面研究)
  4. Ecological Correlation Study (生态学研究)

Explanation

A Cohort Study (队列研究) begins with an identified cohort of disease-free individuals categorized by exposure status (exposed vs unexposed) and follows them over time to measure and compare disease incidence. Because incidence rates in both groups are directly observed, the Relative Risk (RR = Incidence_exposed / Incidence_unexposed) can be directly calculated, providing the strongest observational evidence of causation and minimizing recall bias.

Question 48Population health, epidemiology and primary-care continuity

What does the standardized '5A' clinical framework represent in primary care brief smoking cessation counseling (基层戒烟干预 5A 模式)?

  1. Ask (询问), Advise (建议), Assess (评估), Assist (帮助), and Arrange (安排随访) Correct answer.
  2. Avoid, Attack, Argue, Arrest, and Abandon
  3. Allopurinol, Aspirin, Atenolol, Amlodipine, and Atorvastatin
  4. Always, Almost, Already, Anyway, and Anytime

Explanation

The '5A' model is the evidence-based brief clinical tobacco intervention framework recommended for primary healthcare providers: 1) Ask (询问) - systematically identify tobacco use at every visit; 2) Advise (建议) - strongly urge all tobacco users to quit; 3) Assess (评估) - determine willingness to make a quit attempt; 4) Assist (帮助) - aid the patient with a quit plan, counseling, or pharmacotherapy; 5) Arrange (安排随访) - schedule follow-up contact.

Question 49Population health, epidemiology and primary-care continuity

According to the Chinese Dietary Guidelines (中国居民膳食指南), what is the recommended maximum daily dietary salt intake for healthy adults in rural health promotion campaigns?

  1. Less than 5 grams per day (< 5 g/天, roughly one flat beer bottle cap) Correct answer.
  2. 20 to 30 grams per day
  3. 50 grams per day
  4. Zero grams per day with complete lifelong sodium abstinence

Explanation

According to the Chinese Dietary Guidelines (2022) and the 'Healthy China 2030' initiative, adults should restrict daily dietary salt intake to less than 5 grams per day (<5 g/天, equivalent to less than 2000 mg of sodium or approximately one level beer bottle cap). Reducing excess sodium intake is the single most cost-effective population intervention for lowering blood pressure and preventing stroke in rural China.

Question 50Population health, epidemiology and primary-care continuity

When a severe animal-bite wound requires closure after thorough cleansing, which approach is consistent with rabies post-exposure wound management?

  1. Infiltrate indicated rabies immunoglobulin into and around the wound first, then use the minimum necessary loose closure under clinical guidance while completing vaccination Correct answer.
  2. Suturing makes the scar look too cosmetically pleasant
  3. Suturing permanently destroys bone marrow hematopoiesis
  4. Suturing eliminates the need for any rabies vaccine

Explanation

Rabies exposure care starts with immediate, thorough washing and virucidal treatment. If category III exposure requires rabies immunoglobulin, it is infiltrated into and around the wound before closure. Some wounds may then require minimal, loose closure for function, bleeding control, or reconstruction; closure is not categorically limited to life-threatening hemorrhage. Vaccination and the rest of post-exposure prophylaxis must proceed according to exposure and prior-immunization status.