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CBR AM practice questions

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Question 1Patient Assessment, Selection, and Preoperative Preparation

During preanesthesia evaluation, which finding most strongly suggests the need to delay elective surgery pending further cardiac workup?

  1. A history of well-tolerated exercise-induced leg cramping
  2. A new-onset third heart sound with resting dyspnea Correct answer.
  3. A grade 2 systolic murmur heard at the left sternal border
  4. Controlled hypertension with a blood pressure of 138/84 mmHg

Explanation

New-onset heart failure signs such as an S3 gallop with resting dyspnea indicate decompensated cardiac disease, which carries high perioperative risk and warrants optimization before elective surgery. Stable murmurs and controlled hypertension do not by themselves require delay.

Question 2Patient Assessment, Selection, and Preoperative Preparation

According to the ASA physical status classification, a patient with well-controlled type 2 diabetes and no other systemic disease is best classified as:

  1. ASA II Correct answer.
  2. ASA I
  3. ASA III
  4. ASA IV

Explanation

ASA II designates a patient with mild systemic disease, which includes well-controlled diabetes mellitus without significant end-organ damage. ASA I requires a completely healthy patient, while ASA III denotes severe systemic disease with functional limitation.

Question 3Patient Assessment, Selection, and Preoperative Preparation

A patient scheduled for surgery reports a prior anaphylactic reaction to a cephalosporin with facial swelling and hypotension. Which preoperative action is most appropriate?

  1. Proceed with the cephalosporin because reactions are usually mild
  2. Administer the same cephalosporin with diphenhydramine premedication
  3. Give a test dose in the operating room and observe briefly
  4. Document the allergy and plan an alternative antibiotic class Correct answer.

Explanation

A documented anaphylactic reaction to a cephalosporin is a true allergy and the drug should be avoided; an alternative antibiotic class should be selected and the allergy clearly documented. Premedication does not reliably prevent anaphylaxis, and test dosing is unsafe for a known severe reactor.

Question 4Patient Assessment, Selection, and Preoperative Preparation

Which airway finding on preoperative assessment most reliably predicts a difficult direct laryngoscopy?

  1. A Mallampati class I oropharynx
  2. A thyromental distance greater than 7 cm
  3. Full cervical spine range of motion
  4. A Mallampati class IV oropharynx Correct answer.

Explanation

Mallampati class IV, in which the soft palate is not visible, is a recognized predictor of difficult laryngoscopy. The other listed findings are associated with easy visualization and do not predict difficulty.

Question 5Patient Assessment, Selection, and Preoperative Preparation

A patient with a body mass index of 42 kg/m2 is scheduled for elective surgery. Which preoperative measure best reduces aspiration and respiratory risk?

  1. Applying noninvasive positive pressure ventilation preoperatively
  2. Instituting a clear-liquid fasting interval and considering aspiration prophylaxis Correct answer.
  3. Encouraging a large carbohydrate drink up to one hour before induction
  4. Prescribing a preoperative incentive spirometry session only

Explanation

Obesity increases gastric volume and aspiration risk, so appropriate fasting and consideration of aspiration prophylaxis are central preoperative measures. Preoperative incentive spirometry alone and noninvasive ventilation do not address aspiration risk.

Question 6Patient Assessment, Selection, and Preoperative Preparation

Which laboratory test is most appropriately ordered routinely before elective surgery in an otherwise healthy 30-year-old asymptomatic patient?

  1. Resting electrocardiogram in all cases
  2. No routine test is indicated based on history alone Correct answer.
  3. Complete blood count in all cases
  4. Coagulation panel in all cases

Explanation

Routine preoperative testing in healthy asymptomatic patients does not improve outcomes and is not recommended; testing should be guided by history, examination, and the planned procedure. Universal CBC, coagulation studies, and ECG are not indicated without clinical indication.

Question 7Patient Assessment, Selection, and Preoperative Preparation

A patient on warfarin for atrial fibrillation is scheduled for an elective procedure requiring normal coagulation. Which preoperative strategy is most appropriate?

  1. Double the warfarin dose two days before surgery
  2. Stop warfarin in advance and bridge with a parenteral anticoagulant when indicated Correct answer.
  3. Stop warfarin the morning of surgery only
  4. Continue warfarin and proceed with the procedure

Explanation

For elective procedures requiring normal coagulation, warfarin is typically stopped several days in advance and bridging with a parenteral anticoagulant is used when the thromboembolic risk warrants it. Continuing or briefly holding warfarin leaves the patient anticoagulated at the time of surgery.

Question 8Patient Assessment, Selection, and Preoperative Preparation

Which preoperative smoking intervention has the clearest evidence for reducing postoperative pulmonary complications?

  1. Reducing to two cigarettes per day until the day of surgery
  2. Continuing smoking but adding preoperative bronchodilators
  3. Switching from cigarettes to cigars two weeks before surgery
  4. Smoking cessation at least 4 to 8 weeks before surgery Correct answer.

Explanation

Smoking cessation beginning at least 4 to 8 weeks before surgery is associated with reduced postoperative pulmonary complications. Continued or reduced smoking and switching to cigars do not achieve this benefit.

Question 9Patient Assessment, Selection, and Preoperative Preparation

A patient reports a history of malignant hyperthermia in a sibling. Which preoperative precaution is most important?

  1. Using only succinylcholine for induction
  2. Proceeding normally because only the sibling was affected
  3. Premedicating with dantrolene routinely before induction
  4. Avoiding all volatile anesthetics and succinylcholine Correct answer.

Explanation

A family history of malignant hyperthermia raises suspicion for susceptibility, so triggering agents such as volatile anesthetics and succinylcholine should be avoided. Dantrolene is a treatment, not a routine premedication, and family history is relevant.

Question 10Patient Assessment, Selection, and Preoperative Preparation

Which finding on preoperative assessment most increases the risk of perioperative aspiration during induction?

  1. A history of well-controlled asthma
  2. Symptomatic gastroesophageal reflux with a full stomach Correct answer.
  3. A body mass index of 24 kg/m2
  4. A Mallampati class I airway

Explanation

Symptomatic reflux combined with a full stomach increases the risk of regurgitation and aspiration during induction. Controlled asthma, normal BMI, and a favorable airway view do not specifically elevate aspiration risk.

Question 11Patient Assessment, Selection, and Preoperative Preparation

A 68-year-old with chronic kidney disease stage 4 is scheduled for elective surgery. Which preoperative consideration is most relevant to anesthetic planning?

  1. No change in fluid or electrolyte management
  2. Routine use of succinylcholine without concern
  3. Reduced clearance of renally eliminated drugs requiring dose adjustment Correct answer.
  4. Increased hepatic metabolism of all anesthetics

Explanation

Advanced chronic kidney disease reduces clearance of renally eliminated drugs, so dosing must be adjusted to avoid prolonged effects. Electrolyte and fluid status also require attention, and succinylcholine can raise potassium dangerously.

Question 12Patient Assessment, Selection, and Preoperative Preparation

Which preoperative instruction about fasting is consistent with current recommendations for elective surgery in a healthy adult?

  1. Water must be withheld for 8 hours before surgery
  2. A light breakfast is permitted up to 2 hours before induction
  3. All oral intake must stop 12 hours before surgery
  4. Clear liquids may be taken up to 2 hours before induction Correct answer.

Explanation

Current fasting guidance permits clear liquids up to 2 hours before induction, which improves comfort and reduces dehydration without increasing aspiration risk. Prolonged fasting of all intake or water is unnecessary and potentially harmful.

Question 13Patient Assessment, Selection, and Preoperative Preparation

A patient with severe aortic stenosis is being evaluated for elective surgery. Which statement best reflects the perioperative concern?

  1. The main risk is excessive preload from vasodilation
  2. The lesion is generally well tolerated because of compensatory hypertrophy
  3. Fixed outflow obstruction limits the ability to increase cardiac output and increases risk Correct answer.
  4. The condition requires no special consideration for elective procedures

Explanation

In severe aortic stenosis, fixed outflow obstruction prevents adequate increases in cardiac output, and maintenance of preload, afterload, and sinus rhythm is critical, making perioperative risk substantial. The lesion is not well tolerated, and vasodilation can precipitate dangerous hypotension.

Question 14Patient Assessment, Selection, and Preoperative Preparation

A patient reports a prior difficult intubation with a documented Cormack-Lehane grade 4 view. Which preoperative step is most appropriate?

  1. Deferring airway planning until after induction
  2. Assuming the airway will be easy because of interval change
  3. Proceeding with standard direct laryngoscopy without review
  4. Obtaining the prior anesthetic record and planning an airway strategy Correct answer.

Explanation

A documented grade 4 view identifies a high risk of difficult laryngoscopy, so the prior anesthetic record should be reviewed and an alternative airway strategy planned in advance. Assuming improvement or deferring planning until after induction risks an airway emergency.

Question 15Patient Assessment, Selection, and Preoperative Preparation

Which preoperative assessment element is most important in a patient with a history of obstructive sleep apnea undergoing elective surgery?

  1. Documenting the severity of sleep apnea and its treatment adherence Correct answer.
  2. Checking the Mallampati class only
  3. Ordering a routine chest radiograph
  4. Measuring the thyromental distance only

Explanation

In obstructive sleep apnea, documenting severity and treatment adherence, such as CPAP use, guides postoperative monitoring and opioid planning. A routine chest radiograph is not indicated, and single airway measurements alone are insufficient.

Question 16Patient Assessment, Selection, and Preoperative Preparation

A patient with a known bleeding disorder and a history of easy bruising is scheduled for elective surgery. Which preoperative evaluation is most appropriate?

  1. Ordering a coagulation panel and consulting hematology as needed Correct answer.
  2. Giving platelet transfusions empirically before any testing
  3. Proceeding without testing because bruising is common
  4. Cancelling surgery permanently without evaluation

Explanation

A history of easy bruising suggests a possible bleeding disorder, so coagulation testing and hematology consultation guide safe perioperative planning. Empiric transfusion without diagnosis or permanent cancellation without evaluation is inappropriate.

Question 17Patient Assessment, Selection, and Preoperative Preparation

Which patient is at highest risk of perioperative pulmonary complications based on preoperative assessment?

  1. A patient with a recent upper respiratory infection and productive cough Correct answer.
  2. A patient with a normal chest radiograph and no symptoms
  3. A patient with a history of well-controlled seasonal allergies
  4. A patient with a mild, well-controlled asthma exacerbation history six months ago

Explanation

An active or recent upper respiratory infection with productive cough increases airway reactivity and secretions, raising the risk of pulmonary complications. Controlled allergies, a normal radiograph, and remote well-controlled asthma carry lower risk.

Question 18Patient Assessment, Selection, and Preoperative Preparation

A patient on a monoamine oxidase inhibitor is scheduled for elective surgery. Which preoperative action is most appropriate?

  1. Continue the drug unchanged and use meperidine for analgesia
  2. Double the dose to prevent withdrawal
  3. Stop the drug abruptly the morning of surgery
  4. Consult the prescriber about tapering and avoid interacting agents Correct answer.

Explanation

Monoamine oxidase inhibitors interact with sympathomimetics and meperidine, so the prescriber should be consulted about tapering and interacting agents avoided. Abrupt cessation or dose increases are unsafe.

Question 19Patient Assessment, Selection, and Preoperative Preparation

Which preoperative finding most suggests undiagnosed pheochromocytoma and warrants delay of elective surgery?

  1. A family history of type 2 diabetes
  2. Episodic headache, palpitations, and diaphoresis with labile hypertension Correct answer.
  3. A single episode of mild anxiety before surgery
  4. Stable hypertension controlled with one agent

Explanation

The classic triad of episodic headache, palpitations, and diaphoresis with labile hypertension suggests pheochromocytoma, which can precipitate a hypertensive crisis during anesthesia and requires evaluation before elective surgery. The other findings do not suggest this diagnosis.

Question 20Patient Assessment, Selection, and Preoperative Preparation

During preoperative assessment, a patient reports a prior reaction to latex with itching and hives. Which measure is most appropriate?

  1. Premedicating and using latex gloves
  2. Using a latex-free environment and supplies Correct answer.
  3. Testing latex sensitivity in the operating room
  4. Proceeding with standard latex-containing supplies

Explanation

A documented latex reaction warrants a latex-free environment and supplies to prevent anaphylaxis. Premedication does not reliably prevent reactions, and in-room testing is unsafe.

Question 21Patient Assessment, Selection, and Preoperative Preparation

A patient with cirrhosis and ascites is scheduled for elective surgery. Which preoperative assessment best guides risk?

  1. Assessing liver synthetic function and portal hypertension severity Correct answer.
  2. Assuming normal coagulation because the patient feels well
  3. Relying on Mallampati class alone
  4. Checking only the white blood cell count

Explanation

In cirrhosis, liver synthetic function and the severity of portal hypertension, often summarized by scoring systems such as Child-Pugh or MELD, best predict perioperative risk. Isolated white cell count or airway class does not capture this risk, and coagulation is often abnormal.

Question 22Patient Assessment, Selection, and Preoperative Preparation

Which preoperative measure is most appropriate for a patient with poorly controlled diabetes scheduled for elective surgery?

  1. Proceeding without glucose assessment
  2. Withholding all insulin indefinitely
  3. Checking glucose and coordinating perioperative glycemic management Correct answer.
  4. Encouraging a large carbohydrate meal before surgery

Explanation

Poorly controlled diabetes increases infection and wound complications, so glucose should be assessed and perioperative glycemic management coordinated. Ignoring glucose, withholding insulin indefinitely, or a large meal before surgery is inappropriate.

Question 23Patient Assessment, Selection, and Preoperative Preparation

A patient reports a prior episode of postoperative nausea and vomiting after general anesthesia. Which preoperative planning step is most appropriate?

  1. Ignoring the history as unrelated to anesthesia
  2. Using only a single antiemetic after symptoms appear
  3. Avoiding all antiemetics preoperatively
  4. Planning a multimodal antiemetic strategy Correct answer.

Explanation

A history of postoperative nausea and vomiting is a strong predictor of recurrence, so a multimodal prophylactic antiemetic strategy should be planned. Ignoring the history or waiting for symptoms to appear is less effective.

Question 24Patient Assessment, Selection, and Preoperative Preparation

Which preoperative assessment most appropriately addresses the risk of venous thromboembolism for an elective procedure?

  1. Assuming low risk in all ambulatory patients
  2. Checking only the platelet count
  3. Relying on the patient's age alone
  4. Assessing mobility, prior thrombosis, and procedure type to guide prophylaxis Correct answer.

Explanation

Venous thromboembolism risk depends on factors such as immobility, prior thrombosis, and the type and duration of the procedure, which together guide prophylaxis selection. Platelet count alone, age alone, or blanket assumptions are insufficient.

Question 25Patient Assessment, Selection, and Preoperative Preparation

A patient with a documented penicillin allergy requiring surgical prophylaxis is being evaluated. Which approach best reflects appropriate preoperative planning?

  1. Using a penicillin regardless of the reaction history
  2. Giving no antibiotic prophylaxis at all
  3. Selecting an appropriate alternative agent based on the reaction and local guidance Correct answer.
  4. Canceling surgery indefinitely

Explanation

When a penicillin allergy is documented, an appropriate alternative prophylactic agent should be chosen according to the nature of the reaction and local guidance. Using penicillin regardless, indefinite cancellation, or omitting prophylaxis exposes the patient to avoidable risk.

Question 26Patient Assessment, Selection, and Preoperative Preparation

A 45-year-old woman is scheduled for elective laparoscopic cholecystectomy. On preoperative assessment she reports a previous anaphylactic reaction to succinylcholine during a prior operation. Which preoperative action is most appropriate?

  1. Premedicate with diphenhydramine and proceed with the original anesthetic plan
  2. Obtain serum tryptase levels before surgery to confirm the diagnosis
  3. Proceed with the planned anesthetic because succinylcholine reactions are rarely reproducible
  4. Document the reaction and plan a trigger-free anesthetic avoiding all volatile agents and succinylcholine Correct answer.

Explanation

A prior anaphylactic reaction to a neuromuscular blocking agent warrants documentation and avoidance of all suspected triggers, since cross-reactivity among neuromuscular blockers is common. Volatile anesthetics are not implicated in this reaction and may be used. Allergy testing after the event is the way to confirm the culprit, not preoperative tryptase.

Question 27Patient Assessment, Selection, and Preoperative Preparation

A 72-year-old man with a permanent pacemaker is scheduled for elective colon resection using monopolar electrocautery. Which preoperative assessment element is most important for safe perioperative management?

  1. The date of the most recent device interrogation only
  2. The programmed pacing mode and whether the patient is pacemaker-dependent Correct answer.
  3. The battery model and manufacturer of the device
  4. Whether the patient has ever experienced palpitations

Explanation

Knowing whether the patient is pacemaker-dependent and the programmed mode determines whether reprogramming or backup pacing is needed when electromagnetic interference is likely. Monopolar cautery can inhibit pacing or cause inappropriate tracking, so the dependency status drives the plan. Device manufacturer and palpitation history are less decisive than dependency and mode.

Question 28Patient Assessment, Selection, and Preoperative Preparation

Which preoperative finding in an adult scheduled for elective surgery most strongly suggests undiagnosed obstructive sleep apnea and should prompt further evaluation?

  1. A history of seasonal allergic rhinitis
  2. A report of witnessed apneas and loud snoring with daytime somnolence Correct answer.
  3. Occasional difficulty falling asleep before travel
  4. A body mass index of 27 kg/m2 with no other symptoms

Explanation

Witnessed apneas, loud snoring, and daytime somnolence together form the classic symptom triad of obstructive sleep apnea and warrant formal screening before elective surgery. These patients are at increased risk of perioperative airway and respiratory complications. The other findings are common and nonspecific.

Question 29Patient Assessment, Selection, and Preoperative Preparation

A 60-year-old woman scheduled for elective hip arthroplasty has a history of heparin-induced thrombocytopenia confirmed serologically two years ago. Which preoperative anticoagulation plan is most appropriate?

  1. Proceed without any pharmacologic thromboprophylaxis
  2. Use low-molecular-weight heparin at reduced dose
  3. Avoid heparin products and use a non-heparin anticoagulant for prophylaxis Correct answer.
  4. Use unfractionated heparin with platelet monitoring

Explanation

A confirmed history of heparin-induced thrombocytopenia is an absolute contraindication to both unfractionated and low-molecular-weight heparin because of the risk of recurrent thrombocytopenia and thrombosis. Non-heparin agents such as fondaparinux or a direct oral anticoagulant are appropriate for prophylaxis. Omitting prophylaxis entirely leaves the patient at high venous thromboembolism risk after major orthopedic surgery.

Question 30Patient Assessment, Selection, and Preoperative Preparation

A patient scheduled for elective surgery has a serum potassium of 6.3 mmol/L on preoperative testing with no obvious cause. Which action is most appropriate before proceeding?

  1. Repeat the test after surgery to confirm the value
  2. Proceed with surgery and correct potassium postoperatively
  3. Give intravenous calcium and proceed as scheduled
  4. Delay elective surgery and evaluate the cause of hyperkalemia Correct answer.

Explanation

Unexplained significant hyperkalemia can cause life-threatening arrhythmias under anesthesia and may signal renal failure, adrenal insufficiency, or medication effects. Elective surgery should be postponed until the cause is identified and potassium is corrected. Treating intraoperatively and proceeding exposes the patient to avoidable risk.

Question 31Patient Assessment, Selection, and Preoperative Preparation

A 55-year-old man scheduled for elective surgery reports that his mother and sister both developed malignant hyperthermia under anesthesia. Which preoperative assessment conclusion is most accurate?

  1. He can safely receive succinylcholine because he has never reacted
  2. He requires preoperative muscle biopsy to proceed with any anesthetic
  3. He is at no increased risk because only first-degree relatives matter
  4. He is at increased genetic susceptibility and should receive a trigger-free anesthetic Correct answer.

Explanation

A family history of malignant hyperthermia in close relatives raises the probability of susceptibility, and a trigger-free technique avoiding volatile anesthetics and succinylcholine is the safe approach. Genetic susceptibility is inherited, so affected siblings and parents both matter. Muscle biopsy is no longer required to proceed when a trigger-free plan is used.

Question 32Patient Assessment, Selection, and Preoperative Preparation

Which preoperative assessment best identifies a patient at increased risk of perioperative aspiration related to delayed gastric emptying?

  1. Recording the patient's usual blood pressure
  2. Asking about prior surgical site infections
  3. Measuring body temperature on the morning of surgery
  4. Asking about daily opioid use, gastroparesis, and symptoms of reflux or early satiety Correct answer.

Explanation

Opioids, diabetic gastroparesis, and reflux or early satiety all slow gastric emptying and increase aspiration risk, so they should be specifically elicited. These factors inform fasting strategy and airway planning. Vital signs and infection history do not address gastric content risk.

Question 33Patient Assessment, Selection, and Preoperative Preparation

A 70-year-old woman with severe chronic obstructive pulmonary disease is scheduled for elective open abdominal surgery. Which preoperative intervention most appropriately reduces her pulmonary complication risk?

  1. Immediate cancellation of all elective abdominal surgery
  2. Referral for optimization with smoking cessation, bronchodilators, and inspiratory muscle training where indicated Correct answer.
  3. Routine preoperative antibiotics for all patients
  4. Preoperative bed rest to conserve respiratory reserve

Explanation

Optimizing lung function with smoking cessation, bronchodilator therapy, and inspiratory muscle training improves outcomes in high-risk patients with COPD undergoing major surgery. Neuraxial or minimally invasive approaches may also be considered. Routine antibiotics and bed rest do not address pulmonary risk and may cause harm.

Question 34Patient Assessment, Selection, and Preoperative Preparation

A patient scheduled for elective surgery takes a direct oral anticoagulant for atrial fibrillation. Which preoperative assessment step is most appropriate?

  1. Confirm the specific agent, dose, renal function, and planned procedure bleeding risk to time interruption Correct answer.
  2. Stop the drug on the day of surgery regardless of renal function
  3. Substitute aspirin for the anticoagulant without further planning
  4. Check only the platelet count before proceeding

Explanation

Interruption timing for direct oral anticoagulants depends on the agent's half-life, renal clearance, and the bleeding risk of the procedure. Renal function matters especially for dabigatran. A uniform same-day stop or aspirin substitution ignores these variables.

Question 35Patient Assessment, Selection, and Preoperative Preparation

Which preoperative assessment element is most important before elective surgery in a patient with a history of alcohol use disorder?

  1. Quantifying recent intake to anticipate withdrawal and its perioperative complications Correct answer.
  2. Asking whether the patient prefers wine or beer
  3. Checking only the liver enzymes
  4. Scheduling surgery in the afternoon to reduce tremor

Explanation

Recent heavy alcohol intake predicts perioperative withdrawal, which can cause agitation, seizures, and arrhythmias, and it also affects anesthetic requirements and bleeding risk. Quantifying intake allows prophylaxis and monitoring. Liver enzymes alone underestimate functional risk, and beverage preference is irrelevant.

Question 36Patient Assessment, Selection, and Preoperative Preparation

A 65-year-old man scheduled for elective major vascular surgery has a history of myocardial infarction eight months ago and reports no current angina. Which preoperative assessment is most appropriate?

  1. Delay surgery until one year has passed since the infarction
  2. Order routine stress testing for all patients before vascular surgery
  3. Assess functional capacity and symptoms, and continue guideline-directed cardiac medications through surgery Correct answer.
  4. Stop beta-blockers to avoid intraoperative bradycardia

Explanation

Current guidelines emphasize functional capacity and symptom assessment, with continuation of beta-blockers, statins, and antiplatelet therapy as appropriate. Routine stress testing for all patients is not recommended because it rarely changes management. A fixed waiting period is not required once the patient is clinically stable.

Question 37Surgical and Procedural Interventions

During a computed tomography–guided percutaneous lung biopsy using a coaxial technique, which needle component remains in place across multiple tissue samplings so the pleural surface is crossed only once?

  1. The guidewire
  2. The specimen notch
  3. The inner stylet
  4. The outer cannula Correct answer.

Explanation

In a coaxial system the outer cannula is placed once and stays across the pleura while the inner stylet and biopsy needles are exchanged through it. This limits repeated pleural puncture and reduces the risk of pneumothorax. The stylet only guides initial placement and is removed after the cannula is positioned.

Question 38Surgical and Procedural Interventions

A patient is scheduled for percutaneous image-guided biopsy of a renal mass. Which pre-procedure laboratory value most directly determines the need for platelet transfusion or a different approach?

  1. Platelet count Correct answer.
  2. Serum creatinine
  3. Alkaline phosphatase
  4. Serum potassium

Explanation

Bleeding risk for percutaneous biopsy is governed chiefly by coagulation status, and a low platelet count may require correction before puncture. Creatinine, potassium, and alkaline phosphatase reflect renal function and metabolism rather than immediate hemorrhagic risk. Coagulation parameters and platelet count are therefore the standard pre-biopsy screen.

Question 39Surgical and Procedural Interventions

Which imaging modality is the standard guidance method for percutaneous radiofrequency ablation of a small hepatocellular carcinoma because it allows real-time needle visualization and immediate assessment of the ablation zone?

  1. Mammography
  2. Ultrasound Correct answer.
  3. Fluoroscopy
  4. Positron emission tomography

Explanation

Ultrasound provides real-time multiplanar needle guidance and allows immediate evaluation of the ablation zone as echogenic gas forms. It is widely used for hepatic tumors visible sonographically. Fluoroscopy, mammography, and PET do not offer the same combination of real-time needle tracking and bedside availability.

Question 40Surgical and Procedural Interventions

A 62-year-old man undergoes CT-guided core biopsy of a lung nodule. Immediately after the needle is withdrawn, which finding on the post-procedure chest radiograph most specifically indicates a pneumothorax?

  1. Patchy perilesional ground-glass opacity
  2. A visible pleural line separated from the chest wall Correct answer.
  3. A small pleural effusion
  4. Subcutaneous emphysema

Explanation

A pneumothorax appears as a visceral pleural line separated from the parietal pleura by a lucent space devoid of lung markings. Perilesional ground-glass opacity represents expected post-biopsy hemorrhage. Pleural effusion and subcutaneous emphysema may accompany a procedure but do not by themselves define pneumothorax.

Question 41Surgical and Procedural Interventions

Which access route is used for percutaneous transhepatic biliary drainage when the obstruction is at the level of the common bile duct and the intrahepatic ducts are dilated?

  1. Left femoral vein puncture
  2. Right-sided intercostal puncture of a peripheral intrahepatic duct Correct answer.
  3. Transrectal puncture
  4. Right internal jugular vein puncture

Explanation

Percutaneous transhepatic biliary drainage is performed by puncturing a dilated peripheral intrahepatic bile duct, usually via a right intercostal approach under fluoroscopic or ultrasound guidance. Femoral and jugular venous routes are used for vascular or transjugular procedures, not biliary access. Transrectal puncture is unrelated to biliary drainage.

Question 42Surgical and Procedural Interventions

During ultrasound-guided core needle biopsy of a thyroid nodule, which maneuver best reduces the risk of injuring the adjacent carotid artery?

  1. Increasing the biopsy needle gauge
  2. Color Doppler mapping of the vessels before needle advancement Correct answer.
  3. Using a longer throw on the biopsy gun
  4. Applying suction during the biopsy

Explanation

Color Doppler identifies the carotid and jugular vessels so the needle path can be planned to avoid them. Larger needles, longer throw, and suction affect specimen yield and trauma but do not help avoid vascular structures. Vessel mapping is the key safety step before advancing the needle.

Question 43Surgical and Procedural Interventions

Which patient instruction is most appropriate before an outpatient image-guided percutaneous biopsy?

  1. Avoid all physical activity for one month
  2. Fast from all fluids for 24 hours
  3. Stop all antihypertensive medications for one week
  4. Withhold anticoagulants for the interval specified by the prescribing protocol Correct answer.

Explanation

Anticoagulant and antiplatelet agents are held for a protocol-defined interval before percutaneous biopsy to reduce bleeding risk. Prolonged fasting from fluids, stopping antihypertensives for a week, and a month of inactivity are not standard requirements and may cause harm. The holding interval is coordinated with the prescribing clinician.

Question 44Surgical and Procedural Interventions

Which structure is deliberately targeted during a percutaneous nephrostomy when the goal is to enter the collecting system through a calyx that minimizes vascular injury?

  1. The renal pelvis directly through the sinus
  2. The renal hilum
  3. A posterior calyx through a Brodel avascular plane Correct answer.
  4. The upper ureter

Explanation

Puncture through a posterior calyx along Brodel's avascular plane reduces the risk of significant vascular injury during nephrostomy. Direct hilar, renal sinus, or ureteral puncture carries higher vascular and visceral risk. Calyceal selection is therefore a core technical principle of percutaneous renal access.

Question 45Surgical and Procedural Interventions

A patient with a coagulopathy undergoes CT-guided biopsy of a liver lesion. Which modification most directly reduces hemorrhagic risk while preserving diagnostic yield?

  1. Switching to a larger cutting needle
  2. Performing the biopsy without imaging guidance
  3. Using a smaller-gauge needle with a coaxial technique Correct answer.
  4. Increasing the number of passes to ten

Explanation

A smaller-gauge needle with coaxial technique limits the caliber and number of pleural or capsular punctures, lowering bleeding risk while still providing adequate cores. More passes, a larger cutting needle, and blind technique all increase risk or reduce safety. Yield is preserved because samples are still obtained through the single cannula.

Question 46Surgical and Procedural Interventions

During radiofrequency ablation of a hepatic tumor near the gallbladder, which strategy best protects the gallbladder from thermal injury?

  1. Omitting imaging during the ablation
  2. Placing the electrode closer to the gallbladder wall
  3. Increasing ablation power to shorten the procedure
  4. Hydrodissection with fluid to create a buffer between tumor and gallbladder Correct answer.

Explanation

Hydrodissection instills fluid to separate the tumor from adjacent heat-sensitive structures such as the gallbladder, bowel, or diaphragm. Higher power, closer electrode placement, and absent imaging monitoring all increase the chance of collateral thermal damage. Creating a physical buffer is the established protective technique.

Question 47Surgical and Procedural Interventions

A patient develops fever, rigors, and hypotension within an hour of percutaneous biliary drain placement. Which complication should be suspected first?

  1. Needle-track hemorrhage
  2. Contrast-induced nephropathy
  3. Pneumothorax
  4. Cholangitis with sepsis from biliary manipulation Correct answer.

Explanation

Instrumentation of an obstructed biliary system can seed bacteria into the bloodstream, producing cholangitis and septic shock shortly after the procedure. Nephropathy evolves over days and does not cause immediate rigors. Hemorrhage and pneumothorax produce different findings such as falling hematocrit or pleural air.

Question 48Surgical and Procedural Interventions

Which factor most limits the use of thermal ablation for a 4 cm hepatocellular carcinoma adjacent to the colon?

  1. Need for iodinated contrast
  2. Risk of collateral thermal injury to the bowel Correct answer.
  3. Requirement for general anesthesia
  4. Inability to visualize the tumor on ultrasound

Explanation

Tumors abutting the bowel carry a high risk of thermal injury, perforation, or fistula, so ablation must be modified with hydrodissection, temperature monitoring, or an alternative therapy. Tumor visibility, anesthesia type, and contrast use are secondary considerations. Proximity to a heat-sensitive organ is the dominant constraint.

Question 49Surgical and Procedural Interventions

A patient with a bleeding disorder needs a percutaneous lung biopsy. Which approach best balances diagnostic yield with safety?

  1. Empiric thoracotomy
  2. Immediate biopsy with a large cutting needle
  3. Biopsy without any coagulation testing
  4. Coagulation correction followed by a coaxial core biopsy with limited passes Correct answer.

Explanation

Correcting coagulopathy before a coaxial core biopsy with a limited number of passes reduces hemorrhagic risk while still obtaining adequate tissue. Immediate large-needle biopsy or omitting coagulation testing increases danger. Thoracotomy is disproportionate for a diagnostic question.

Question 50Surgical and Procedural Interventions

During CT fluoroscopy–guided biopsy, which practice best reduces occupational radiation dose to the operator?

  1. Using intermittent rather than continuous fluoroscopy and stepping back from the gantry Correct answer.
  2. Removing lead shielding to improve dexterity
  3. Standing beside the gantry throughout the procedure
  4. Increasing the fluoroscopy time to improve accuracy

Explanation

Intermittent CT fluoroscopy and increasing distance from the gantry reduce operator dose substantially. Continuous exposure, longer fluoroscopy time, and removal of shielding all increase dose. Distance and time are the most modifiable dose-reduction factors.