Perioperative Management - USMLE Step 2

1. Which of the following is the most important intraoperative measure to reduce this patient's risk of a surgical site infection?
   Answer: Maintaining strict glycemic control with an insulin infusion While antibiotic redosing, appropriate skin preparation, and maintaining normothermia are all important components of SSI prevention bundles, perioperative hyperglycemia is a major independent and modifiable risk factor for SSI, particularly in orthopedic and cardiac surgery. Elevated blood glucose impairs neutrophil function and promotes bacterial growth. For this patient with known diabetes and preoperative hyperglycemia, maintaining strict intraoperative glycemic control (e.g., target <180-200 mg/dL) with an insulin infusion is the most critical intervention to reduce his infection risk.
2. Which of the following is the most appropriate management plan?
   Answer: Proceed with surgery, notifying anesthesia of high OSA risk and planning for enhanced postoperative monitoring This patient has a high probability of severe, undiagnosed obstructive sleep apnea (OSA) based on his symptoms and BMI (high STOP-BANG score). Patients with OSA are at increased risk of perioperative complications, particularly respiratory depression from anesthetics and opioids. The most appropriate approach is to proceed with surgery but with significant precautions. This includes informing the anesthesia team to consider regional anesthesia and minimize opioids, and planning for enhanced postoperative monitoring, such as in a telemetry or step-down unit, with continuous pulse oximetry. Canceling an often necessary surgery for a formal sleep study can cause significant delays. Ignoring the risk is unsafe. Recommending bariatric surgery first does not address the immediate surgical need.
3. What is the most appropriate instruction for managing his diabetes medications on the day of surgery?
   Answer: Take half the usual dose of insulin glargine and hold metformin Metformin should be held for at least 24 hours before major surgery, especially procedures associated with hemodynamic instability, renal impairment, or use of iodinated contrast, due to the risk of lactic acidosis. Basal insulin (glargine) should be continued to prevent hyperglycemia and ketosis during the stress of surgery. However, because the patient will be NPO (nothing by mouth), the dose is typically reduced to 50-75% of the usual dose to prevent hypoglycemia. Holding basal insulin entirely can lead to severe hyperglycemia.
4. Which of the following antibiotic regimens provides the most appropriate prophylaxis for this procedure?
   Answer: Ceftriaxone plus metronidazole Colorectal surgery is a clean-contaminated procedure with high risk of infection from enteric flora, including gram-negative bacteria and anaerobes. Prophylactic antibiotics must provide coverage for both. Cefazolin alone lacks adequate anaerobic coverage. Vancomycin covers only gram-positive organisms. Gentamicin covers gram-negatives but not anaerobes. The combination of ceftriaxone (broad gram-negative coverage) plus metronidazole (anaerobic coverage) is a standard recommended regimen. Alternative single agents with dual coverage include cefoxitin, ertapenem, or ampicillin-sulbactam.
5. Which of the following is the most appropriate strategy for his perioperative pain management?
   Answer: Continue his baseline opioid requirement and add short-acting opioids for acute pain Patients on chronic opioid therapy are opioid-tolerant and will have both a baseline pain requirement and acute surgical pain. The most appropriate management is to continue their baseline chronic opioid dose (or an equianalgesic equivalent) throughout the perioperative period to prevent withdrawal and treat their chronic pain. Acute surgical pain should be treated on top of this baseline with additional, short-acting opioids (e.g., via a patient-controlled analgesia pump). Holding their home regimen would cause withdrawal and uncontrolled pain. Tapering before surgery is generally not feasible or recommended. Switching to methadone is a complex process reserved for specialists and not a routine preoperative adjustment.
6. A 76-year-old man with prior MI and stable angina is scheduled for elective abdominal aortic aneurysm repair. He takes metoprolol chronically. On the morning of surgery, a nurse asks whether to administer his beta-blocker. Physical exam: - BP 118/68 mm Hg, HR 58 - No wheezes; no signs of decompensated heart failure Pertinent studies: - ECG: sinus bradycardia, old inferior infarct Current medications: - Metoprolol - Aspirin - Atorvastatin - Isosorbide mononitrate Which medication should be adjusted or discontinued prior to surgery?
   Answer: Continue metoprolol through the perioperative period This question tests USMLE Step 2 CK perioperative management skills, specifically the ability to optimize patients preoperatively and manage perioperative risks. Perioperative management involves evaluating surgical risk, optimizing medical conditions, and planning for potential complications. In this vignette, the patient presents with prior MI on chronic metoprolol, requiring continuation to prevent withdrawal effects during major surgery. The correct choice, B, is supported by ACC/AHA guidelines for perioperative beta-blocker management, addressing the patient's cardiovascular stability. A common distractor, A, fails because it risks rebound tachycardia, often due to fear of bradycardia without evidence of decompensation. Effective teaching strategies include reviewing current guidelines for perioperative care and practicing case scenarios that highlight common pitfalls. Emphasize the importance of individualizing care based on comprehensive risk assessment.
7. Which of the following is the most appropriate antibiotic prophylaxis for this patient?
   Answer: Cefazolin administered 30 minutes before skin incision Laparoscopic cholecystectomy is a clean-contaminated procedure, and surgical site infection (SSI) prophylaxis is recommended. The most common organisms are skin flora and enteric gram-negatives. Cefazolin, a first-generation cephalosporin, provides excellent coverage against these organisms and is the standard of care. It should be administered within 60 minutes of skin incision to ensure adequate tissue levels. Vancomycin is reserved for patients with a severe beta-lactam allergy or high risk for MRSA. Metronidazole alone provides inadequate coverage. Withholding prophylaxis would increase the risk of SSI.
8. A 72-year-old man with hypertension and diabetes is scheduled for elective laparoscopic cholecystectomy. He has exertional chest tightness when walking uphill that resolves with rest; symptoms are unchanged for 6 months. He can climb one flight of stairs but must stop due to chest discomfort. Physical exam: - BP 136/80 mm Hg, HR 70 - Normal heart sounds; lungs clear Pertinent studies: - ECG: Q waves in V1–V2; no acute changes - Troponin not obtained Current medications: - Metoprolol - Aspirin - Atorvastatin - Metformin What is the most appropriate preoperative assessment for this patient?
   Answer: Order noninvasive stress testing before surgery This question tests USMLE Step 2 CK perioperative management skills, specifically the ability to optimize patients preoperatively and manage perioperative risks. Perioperative management involves evaluating surgical risk, optimizing medical conditions, and planning for potential complications. In this vignette, the patient presents with exertional chest tightness and poor functional capacity, requiring cardiac evaluation before elective surgery. The correct choice, C, is supported by ACC/AHA guidelines for preoperative cardiac risk assessment, addressing the patient's active symptoms and inability to achieve 4 METs. A common distractor, A, fails because it ignores unstable angina symptoms, often due to overreliance on asymptomatic status. Effective teaching strategies include reviewing current guidelines for perioperative care and practicing case scenarios that highlight common pitfalls. Emphasize the importance of individualizing care based on comprehensive risk assessment.
9. A 69-year-old man is scheduled for elective hip replacement. He has atrial fibrillation and takes rivaroxaban. He also takes amiodarone and has normal renal function. The surgeon plans spinal anesthesia. Physical exam: - BP 124/72 mm Hg, HR 68 irregular Pertinent labs: - Cr 0.9 mg/dL - Hgb 14.0 g/dL, platelets 200k/µL Current medications: - Rivaroxaban 20 mg nightly - Amiodarone - Amlodipine Which medication should be adjusted or discontinued prior to surgery?
   Answer: Stop rivaroxaban 72 hours before spinal anesthesia This question tests USMLE Step 2 CK perioperative management skills, specifically the ability to optimize patients preoperatively and manage perioperative risks. Perioperative management involves evaluating surgical risk, optimizing medical conditions, and planning for potential complications. In this vignette, the patient presents with atrial fibrillation on rivaroxaban and amiodarone, requiring extended hold before spinal anesthesia for hip replacement. The correct choice, A, is supported by ASRA guidelines for neuraxial procedures, addressing the patient's risk of spinal hematoma with drug interactions. A common distractor, B, fails because it provides insufficient hold time for high-risk anesthesia, often due to applying standard DOAC intervals. Effective teaching strategies include reviewing current guidelines for perioperative care and practicing case scenarios that highlight common pitfalls. Emphasize the importance of individualizing care based on comprehensive risk assessment.
10. According to current guidelines, which of the following is the most appropriate next step in his preoperative cardiac management?
    Answer: Proceed with surgery without further cardiac testing This patient has several risk factors for perioperative cardiac complications (history of ischemic heart disease, diabetes), placing him at elevated risk based on the Revised Cardiac Risk Index (RCRI). However, his self-reported functional capacity is excellent (greater than 4 metabolic equivalents [METs], as he can climb two flights of stairs). For patients with good functional capacity undergoing elective noncardiac surgery, further cardiac testing is generally not recommended, as it has not been shown to change outcomes. The patient should proceed with surgery with appropriate medical management.
11. Using the Revised Cardiac Risk Index (RCRI), what is this patient's score?
    Answer: 4 The Revised Cardiac Risk Index (RCRI) assigns one point for each of the following six predictors: (1) High-risk surgery (intraperitoneal, intrathoracic, or suprainguinal vascular), (2) History of ischemic heart disease, (3) History of congestive heart failure, (4) History of cerebrovascular disease, (5) Preoperative treatment with insulin, and (6) Preoperative serum creatinine >2.0 mg/dL. This patient has: (1) High-risk surgery (carotid endarterectomy) [+1], (2) History of ischemic heart disease [+1], (3) No heart failure [0], (4) No cerebrovascular disease [0], (5) Insulin use for diabetes [+1], and (6) Creatinine >2.0 mg/dL [+1]. The total score is 1+1+1+1 = 4.
12. Which of the following is the most effective strategy to prevent postoperative nausea and vomiting (PONV) in this patient?
    Answer: Using a multimodal approach with a scopolamine patch, dexamethasone, and ondansetron This patient has multiple risk factors for PONV (female, non-smoker, history of PONV/motion sickness, major abdominal surgery), placing her at high risk. The most effective strategy for high-risk patients is a multimodal prophylactic approach, using multiple antiemetics from different pharmacologic classes that act on different receptors. A combination of a scopolamine patch (anticholinergic), dexamethasone (corticosteroid), and ondansetron (5-HT3 antagonist) is a powerful preventative regimen. Administering medication 'as needed' is treatment, not prevention. Hydration is supportive but not a primary prophylactic measure. A single agent is less effective than combination therapy.
13. What is the most appropriate recommendation regarding the proposed surgery?
    Answer: Strongly advise against elective surgery due to prohibitive risk The patient's surgical risk is best estimated by the Child-Pugh classification. He has elevated bilirubin (>3 mg/dL, 3 points), low albumin (<2.8 g/dL, 3 points), elevated INR (1.7-2.2, 2 points), and moderate ascites (2 points), for a total of 10 points. This places him in Child-Pugh Class C, which is associated with a perioperative mortality rate of over 50% for abdominal surgery. Elective surgery is contraindicated in patients with Child-Pugh Class C cirrhosis. Attempts to 'optimize' with FFP or albumin do not change the underlying severity of liver dysfunction and the associated high mortality risk.
14. Which of the following medications should be avoided in this patient?
    Answer: Ketorolac Ketorolac is a nonsteroidal anti-inflammatory drug (NSAID) that is very effective for postoperative pain but carries a significant risk of nephrotoxicity. NSAIDs cause constriction of the afferent arteriole of the glomerulus, which can reduce renal blood flow and precipitate acute kidney injury, especially in patients with pre-existing chronic kidney disease (CKD). This patient's eGFR of 45 places him at high risk. Acetaminophen, gabapentin (with dose adjustment for renal function), and topical lidocaine are all safer alternatives that can be used as part of a multimodal analgesic regimen in a patient with CKD.
15. Which of the following is the most appropriate initial step in managing his pain?
    Answer: Administer small, frequent intravenous doses of morphine The patient is experiencing severe acute postoperative pain (8/10). The most appropriate initial step is to gain rapid control of the pain using a titratable, short-acting intravenous opioid like morphine or fentanyl. Administering small, frequent doses allows for titration to effect while monitoring for adverse effects like respiratory depression. Ketorolac alone is unlikely to be sufficient for severe pain. A PCA pump is an excellent tool for managing pain after initial control is achieved, but the first step is to treat the severe pain with titrated boluses. Discharging the patient with uncontrolled pain is inappropriate.
16. A 62-year-old woman is scheduled for elective laparoscopic cholecystectomy. She has hypertension, type 2 diabetes, and coronary artery disease with a drug-eluting stent placed 5 months ago after NSTEMI. She has been asymptomatic since. Physical exam: - BP 126/74 mm Hg, HR 64 - Normal cardiopulmonary exam Pertinent studies: - ECG: Q waves in inferior leads, no acute changes - Troponin: not obtained Current medications: - Aspirin 81 mg daily - Clopidogrel 75 mg daily - Metoprolol - Rosuvastatin - Metformin What is the best next step in optimizing this patient's medical condition before surgery?
    Answer: Delay surgery until 6 months post-stent This question tests USMLE Step 2 CK perioperative management skills, specifically the ability to optimize patients preoperatively and manage perioperative risks. Perioperative management involves evaluating surgical risk, optimizing medical conditions, and planning for potential complications. In this vignette, the patient presents with recent drug-eluting stent placement 5 months ago and is on DAPT, requiring delay to minimize stent thrombosis risk. The correct choice, D, is supported by ACC/AHA guidelines recommending at least 6 months delay for elective surgery post-DES, addressing the patient's high risk of perioperative cardiac events. A common distractor, B, fails because it risks early stent thrombosis by stopping clopidogrel prematurely, often due to underestimating the optimal DAPT duration. Effective teaching strategies include reviewing current guidelines for perioperative care and practicing case scenarios that highlight common pitfalls. Emphasize the importance of individualizing care based on comprehensive risk assessment.
17. Which of the following is the most appropriate perioperative management of her anticoagulation?
    Answer: Administer prothrombin complex concentrate (PCC) and vitamin K This patient requires urgent reversal of warfarin for surgery and is at very high risk for thromboembolism (mechanical mitral valve). Prothrombin complex concentrate (PCC) provides rapid and effective replacement of vitamin K-dependent clotting factors (II, VII, IX, X) and is the preferred agent for emergent reversal. Vitamin K should also be given to sustain the reversal. Fresh frozen plasma (FFP) is less effective, requires larger volumes, and takes longer to administer. Simply discontinuing warfarin is too slow. Heparin bridging is used for elective surgeries where warfarin can be stopped several days in advance.
18. Which of the following is the most appropriate antibiotic prophylaxis?
    Answer: Cefazolin The patient describes a low-risk, non-anaphylactic reaction to a penicillin (a delayed, cutaneous rash). The risk of cross-reactivity between penicillins and first- or second-generation cephalosporins in such patients is extremely low (<2%) and is not higher than the risk of an allergic reaction in the general population. Therefore, it is considered safe to administer cefazolin, which is the preferred agent for prophylaxis in hysterectomy due to its ideal spectrum of activity and safety profile. Clindamycin and vancomycin are appropriate alternatives for patients with a true, severe IgE-mediated beta-lactam allergy, but they are less optimal due to their spectrum or potential for side effects (e.g., C. difficile with clindamycin).
19. To maximally reduce his risk of postoperative pulmonary complications, what is the minimum recommended period for smoking cessation before his surgery?
    Answer: 4 weeks While any duration of smoking cessation before surgery is beneficial (cessation for >48 hours decreases carboxyhemoglobin levels and improves tissue oxygenation), a period of at least 4 weeks is recommended to achieve a significant reduction in postoperative pulmonary complications. This duration allows for improved mucociliary clearance, decreased sputum production, and improved immune function. An 8-week period is associated with even greater benefits, but 4 weeks is the most commonly cited minimum for substantial risk reduction.
20. Which of the following is the most appropriate management of his beta-blocker?
    Answer: Continue the metoprolol, including on the morning of surgery Patients on chronic beta-blocker therapy should continue their medication throughout the perioperative period, including taking their usual dose on the morning of surgery. Abruptly stopping a beta-blocker can lead to rebound tachycardia and hypertension, which can increase the risk of myocardial ischemia and infarction. There is no indication to increase the dose or switch to a different agent in this stable patient. The POISE trial showed that initiating high-dose beta-blockers immediately before surgery in beta-blocker-naive patients increased mortality, highlighting the importance of continuing, but not aggressively starting or titrating, these medications.

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