A patient scheduled for elective hip surgery in 5 days is taking aspirin, a multivitamin, enalapril, and metoprolol. What is the appropriate perioperative management for this patient? A) Stop enalapril B) Stop aspirin to minimize perioperative bleeding risk C) Stop metoprolol to increase cardiac output D) Increase aspirin dosage for additional analgesic benefit
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perioperative management ACE inhibitor aspirin beta blocker elective surgery guidelines 2024
The answer is A) Stop enalapril. Here is a full breakdown:
Correct Answer: A — Stop enalapril (ACE inhibitor) ~24 hours before surgery
This is supported by the 2024 ACC/AHA Perioperative Cardiovascular Management Guideline and multiple authoritative textbook sources. Here's the rationale for each option:
✅ A) Stop enalapril — CORRECT
Enalapril is an ACE inhibitor (RAAS blocker). The 2024 ACC/AHA guideline recommends:
"For patients taking an ACE inhibitor or ARB chronically for hypertension with well-controlled blood pressure, withholding it 24 hours before surgery may limit intraoperative hypotension."
Why: ACE inhibitors blunt the angiotensin II-mediated vasoconstriction that compensates for the vasodilatory and volume-redistributing effects of anesthesia/surgery. Continuing them increases the risk of refractory intraoperative hypotension, which can lead to myocardial ischemia, acute kidney injury, and stroke. This patient takes enalapril for hypertension (not heart failure with reduced ejection fraction), so holding it 24 hours preoperatively is appropriate.
Exception: If the patient were taking an ACEi/ARB for heart failure with reduced ejection fraction (HFrEF), it should generally be continued perioperatively, as the risk of decompensation outweighs the hypotension risk. — Barash's Clinical Anesthesia, 9e
❌ B) Stop aspirin — INCORRECT for this scenario
The decision hinges on the indication for aspirin:
- Primary prevention (no prior MI, stroke, stent): Aspirin should be discontinued ~4–5 days before elective surgery.
- Secondary prevention (prior MI, CAD, stroke, coronary stent): It is reasonable to continue aspirin perioperatively if the cardiac risk outweighs the bleeding risk.
For an elective hip surgery (not intracranial or closed-space surgery), aspirin for secondary prevention is generally not stopped. The Mulholland & Greenfield Surgery textbook states that stopping antiplatelet therapy should be "limited to specific procedures that demand a nearly bloodless surgical field or procedures in closed spaces (intracranial, minimally invasive spine surgery)."
Even if this patient were taking aspirin only for primary prevention, simply stopping aspirin would not be the single most appropriate perioperative action compared to stopping the ACEi. The question asks what is appropriate, and stopping enalapril has clear, consistent guideline support.
❌ C) Stop metoprolol — INCORRECT and potentially dangerous
Beta-blockers (metoprolol) must never be abruptly withdrawn before surgery. Doing so can cause:
- Rebound tachycardia and hypertension
- Perioperative myocardial ischemia or MI
- Arrhythmias
The 2024 ACC/AHA guideline is unambiguous: "Beta-blockers should be continued perioperatively without dose adjustment" in patients already taking them. — Mulholland & Greenfield Surgery, 7e; 2024 ACC/AHA Guidelines
❌ D) Increase aspirin dosage — INCORRECT
Aspirin is not used as a primary analgesic for perioperative pain management in this setting, and increasing its dose preoperatively would amplify platelet inhibition and bleeding risk without any cardiac or analgesic benefit. This is not a guideline-supported strategy.
Summary Table
| Drug | Action | Rationale |
|---|---|---|
| Enalapril (ACEi) | Hold 24h before surgery ✅ | Prevents refractory intraoperative hypotension |
| Aspirin | Continue (if secondary prevention) | Stopping increases thrombotic risk; hip surgery is not high-bleed-risk enough to justify stopping |
| Metoprolol (β-blocker) | Continue unchanged | Abrupt withdrawal causes rebound ischemia/arrhythmia |
| Multivitamin | Can hold or continue | No significant perioperative interaction |
The answer is A. The key principle is that RAAS blockade (ACEi/ARB) used for hypertension should be held ~24 hours before elective surgery to prevent anesthesia-induced hypotension, while beta-blockers must always be continued and aspirin management depends on its indication.
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