Why does the dub sound occur around the peak of the T-wave?
Why does the dub sound occur around the peak of the T-wave?
The heart sounds can be divided into four key components:
S1 (Lub): This is the first heart sound and is associated with the closure of the mitral and tricuspid valves. It occurs at the beginning of systole when the ventricles contract and push blood out.
S2 (Dub): This is the second heart sound and is associated with the closure of the aortic and pulmonary valves. It occurs at the end of systole when the ventricles relax and the semilunar valves close.
S3: This is the third heart sound and is usually indicative of increased blood flow into the ventricles (e.g. in conditions like congestive heart failure).
S4: This is the fourth heart sound and typically indicates resistance to ventricular filling, often seen in hypertensive or ischemic heart disease.
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