Hardest CNOR Practice Questions — Can You Answer These?

For elective non-cardiac surgery, DAPT (Dual Antiplatelet Therapy) should ideally continue for 6 months after DES placement. If surgery is urgent, it may be considered after 3 months, but never before 30 days. Risk: Premature interruption of DAPT significantly increases the risk of stent thrombosis, myocardial infarction, and death. Rationale: Re-endothelialization of the stent takes time; the perioperative pro-thrombotic state exacerbates this risk. Exam Strategy: Distinguish between Bare Metal Stents (30-day delay) and DES (6-month delay for elective cases).

The presentation (murmur location/type and syncope) is classic for Aortic Stenosis (AS). Primary Risk: Severe AS is a high-risk condition for non-cardiac surgery, as the fixed cardiac output cannot meet the increased metabolic demands of surgery/anesthesia, leading to sudden hemodynamic collapse or MI. Clinical Pearl: If suspected, an echocardiogram must be performed within 1 year (or sooner if symptoms changed) before proceeding with elective surgery. Distractor: Do not confuse with Mitral Regurgitation (holosystolic murmur at the apex).

Recommendation: Long-term beta-blockers should be continued on the day of surgery (Class I recommendation). Risk: Acute withdrawal of beta-blockers can lead to rebound hypertension, tachycardia, and myocardial ischemia. Clinical Pearl: Conversely, beta-blockers should NOT be started on the day of surgery in beta-blocker naive patients, as this increases the risk of bradycardia, hypotension, and stroke. Exam Tip: CCI focuses on the continue if already taking, don't start today rule.

Elevated BNP (>100 pg/mL) or NT-proBNP (>300 pg/mL) is a powerful independent predictor of perioperative MACE and mortality. Combined with clinical signs of volume overload (edema, JVD, rales), this patient is in an uncompensated state. Rationale: Surgery should be delayed if elective to optimize fluid status and heart failure medications. Clinical Reasoning: BNP levels provide an objective measure of myocardial wall stress that clinical exams might miss.

Goal: Maintain Right Ventricular (RV) perfusion by avoiding increases in Pulmonary Vascular Resistance (PVR) and maintaining systemic blood pressure. Nursing assessment: Avoid hypoxia, hypercarbia, acidosis, and hypothermia, as these all trigger pulmonary vasoconstriction, which can lead to acute RV failure and circulatory collapse. Rationale: PAH is often more dangerous perioperatively than left-sided heart failure because the RV is highly sensitive to afterload changes.