Medicine
Auscultation Findings in Valvular Heart Disease
Quick fact
Aortic stenosis produces a harsh, 'diamond-shaped' systolic murmur that radiates to the carotid arteries, while mitral regurgitation gives a blowing, holosystolic murmur best heard at the apex.
Why this is interesting
When a doctor listens to your chest, they can often tell which heart valve is failing and whether it leaks or narrows—just by sound. How can a simple stethoscope reveal so much about the heart's plumbing?
Read the full explanation
Understanding Auscultation Findings in Valvular Heart Disease
The heart has four valves that ensure one-way blood flow. When a valve becomes narrowed (stenosis) or leaks (regurgitation), blood flow becomes turbulent, producing sounds called murmurs. With a stethoscope, these murmurs have characteristic timing (systolic or diastolic), location (where they are loudest), and quality. Knowing what happens during systole and diastole helps you predict when each valve will cause a murmur. For example, during systole, the aortic valve opens and the mitral valve closes; if the aortic valve is narrowed, blood is pushed through a tight opening, creating a systolic murmur. If the mitral valve leaks, blood regurgitates into the left atrium during systole, also creating a systolic murmur—but the timing and radiation differ.
A deeper explanation
Valvular heart disease alters normal laminar blood flow into turbulent, high-frequency vibrations that are audible as murmurs. The key is coupling valve anatomy to the cardiac cycle: stenosis of a semilunar valve (aortic or pulmonic) creates a systolic ejection murmur because blood is forced through a narrow orifice during ventricular contraction. Regurgitation of an atrioventricular valve (mitral or tricuspid) creates a holosystolic murmur because the leak persists throughout systole. Diastolic murmurs arise from regurgitation of semilunar valves (aortic regurgitation gives an early diastolic 'blowing' murmur) or stenosis of AV valves (mitral stenosis gives a mid-diastolic rumble with an opening snap). Localizing the murmur to the cardiac apex (mitral) or right upper sternal border (aortic) and noting radiation to the axilla (MR) or carotids (AS) helps differentiate lesions. The exam is also augmented by associated findings such as a slow-rising carotid pulse and sustained apex beat in aortic stenosis. Thus, auscultation is a non-invasive window into hemodynamic burdens that guide further testing and management.