Aortic Valve Disorders
The loudest murmur in the chest doesn't always mean the worst valve — but a shrinking pulse pressure on an aortic stenosis patient signals that the heart is losing the fight.
Core Concept
Aortic valve disorders include aortic stenosis (AS) and aortic regurgitation (AR), each with distinct hemodynamic signatures. In AS, the valve opening narrows (normal 3–4 cm²; severe AS < 1.0 cm²), forcing the left ventricle to generate higher pressures to eject blood. This produces a crescendo-decrescendo (diamond-shaped) systolic murmur best heard at the right second intercostal space, radiating to the carotids. The classic triad — syncope, angina, exertional dyspnea — appears late and signals decompensation. Pulse pressure narrows, and you may feel a weak, slow-rising (parvus et tardus) peripheral pulse. In AR, the valve fails to seal, allowing diastolic backflow into the LV. This produces a high-pitched blowing decrescendo diastolic murmur at the left sternal border. The hallmark is a widened pulse pressure — bounding (water-hammer) pulses, head bobbing with each heartbeat (de Musset sign), and visible nail bed pulsations (Quincke sign). The LV dilates over time from chronic volume overload. Nursing assessment priorities: monitor for signs of left-sided heart failure (dyspnea, crackles, fatigue), track blood pressure trends for narrowing or widening pulse pressure, auscultate heart sounds noting murmur timing and quality, and monitor activity tolerance closely — especially in AS, where sudden death risk increases once symptoms appear.
Watch Out For
Don't confuse the murmur timing: AS is systolic (valve struggles to open), AR is diastolic (valve fails to close). Students mix up pulse pressure direction — AS narrows it, AR widens it. A systolic murmur at the right sternal border radiating to the neck is AS; a diastolic murmur at the left sternal border is AR. These are opposite patterns.
Clinical Pearl
Stenosis squeezes the pressure narrow; regurgitation lets it run wide. Narrow pulse pressure = stenosis. Wide pulse pressure = regurgitation. Match the murmur timing to the valve problem.
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