DAVID MONTGOMERY: Aortic stenosis is a tightening of one of the four major valves of the heart. The aortic valve is particularly important because the aortic valve is the gateway to the rest of ...
and atrial contraction forces blood through the atrioventricular valves, a S4 is produced by the blood striking the left ventricle. CLINICAL PEARL: A S4 heart sound occurs during active LV filling ...
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