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Cardiac Physiology Part 3: Heart Sounds (S1 & S2) and Mechanical Ejection
In clinical practice, mastering cardiac auscultation requires a clear understanding of how the heart’s electrical conduction system triggers its mechanical events. The classic “lub-dub” heart sounds heard on auscultation are the direct mechanical result of valve closures initiated by electrical impulses on the EKG. S1 (“Lub”) – Atrioventricular Valve Closure The first heart sound, S1,…