A 76-year-old man presents to the emergency department after a syncopal episode. Earlier today, he became lightheaded while walking uphill and briefly lost consciousness. He also reports several months of exertional chest pressure and progressive shortness of breath. His medical history is significant for hypertension, hyperlipidemia, and chronic kidney disease. Medications include amlodipine, atorvastatin, and aspirin. Temperature is 36.8°C (98.2°F), blood pressure is 128/74 mm Hg, pulse is 82/min, and respiratory rate is 18/min. Oxygen saturation is 98% on room air. Physical examination reveals a harsh crescendo-decrescendo systolic murmur best heard at the right upper sternal border with radiation to both carotid arteries. Carotid upstrokes are delayed and diminished. Bibasilar crackles are absent. ECG demonstrates left ventricular hypertrophy. Transthoracic echocardiography shows a heavily calcified aortic valve with a valve area of 0.7 cm², mean gradient of 48 mm Hg, and preserved left ventricular ejection fraction.
Which of the following is the most appropriate next step in management?
The correct answer is:
E) Surgical or transcatheter aortic valve replacement
This patient has severe symptomatic aortic stenosis. The classic triad of exertional angina, syncope, and heart failure symptoms strongly suggests advanced disease. Echocardiographic findings confirm severe stenosis with a valve area less than 1.0 cm² and a high transvalvular gradient.
Once symptoms develop, aortic stenosis carries a poor prognosis without valve replacement. Medical therapy can provide limited symptomatic relief but does not alter the natural history of the disease. Therefore, definitive treatment is valve replacement, either surgical (SAVR) or transcatheter (TAVR), depending on age, comorbidities, anatomy, and procedural risk.
A high-yield Step 2 concept is that symptomatic severe aortic stenosis is an indication for valve replacement. The presence of syncope is particularly concerning because it reflects an inability to augment cardiac output during exertion.
Answer choice A: Conservative medical management with annual follow-up, is incorrect.
Observation is appropriate for many patients with asymptomatic severe aortic stenosis, but it is inappropriate once symptoms develop. This patient has exertional angina, dyspnea, and syncope, all of which indicate a need for definitive intervention.
Answer choice B: Exercise stress testing to assess symptom severity, is incorrect.
Stress testing is generally avoided in patients with clearly symptomatic severe aortic stenosis because it may provoke hypotension, arrhythmias, or syncope. It is primarily used in selected asymptomatic patients when symptom status is uncertain.
Answer choice C: Immediate coronary artery bypass grafting, is incorrect.
Coronary artery disease may coexist with aortic stenosis, but there is no evidence in this vignette that bypass surgery is immediately required. The urgent issue is severe symptomatic valve obstruction.
Answer choice D: Long-term nitrate therapy for symptom relief, is incorrect.
Nitrates may transiently reduce angina but do not treat the underlying mechanical obstruction. Excessive vasodilation can also precipitate hypotension in patients with severe aortic stenosis who depend on adequate preload and systemic vascular resistance.
Key Learning Point
The combination of exertional angina, syncope, or heart failure symptoms with echocardiographic evidence of severe aortic stenosis is a strong indication for aortic valve replacement. Symptomatic severe aortic stenosis should not be managed with observation alone.
