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Normal heartbeat sound8/7/2023 ![]() ![]() It represents the closure of the pulmonary and aortic valves, and is created from reverberation within the blood as an effect of the sudden block of flow reversal. The -Dub: This is called the "Second Heart Sound," and for this reason it is designated S2. Upon ventricular contraction, the pressure from the ventricles contracting cause papillary muscles in each ventricle that are attached to the cusps of the tricuspid and mitral valves via chordae tendineae (heart strings) to become tense and prevent the backflow of blood. Normally, M1 occurs slightly before T1, but in certain cases the order can be reversed, as often found in a left bundle branch block. S1 is composed of mitral valve closure and tricuspid valve closure, known as M1 and T1, and takes place at the beginning of ventricular contraction (systole). Since it occurs first, it represents the beginning of atrial diastole and the initiation of ventricular systole. It represents the nearly simultaneous closure of the left and right atrioventricular valves-that is, the mitral and tricuspid valves, respectively, and is created from reverberation within the blood as an effect of the sudden block of blood flow by the valves. The Lub-: This is called the "First Heart Sound," and for this reason it is designated S1. The clichéd " Lub-Dub" of the heartbeat heard through a stethoscope minimizes and understates the complexity of what's actually going on. There are two normal heart sounds, labeled S1 and S2, and extra heart sounds labeled S3 and S4. the left fifth intercostal space at the left midclavicular line (mitral valve).the left fourth and fifth intercostal spaces at the lower left sternal border (tricuspid valve), and.the left third intercostal space at the left sternal border (Erb’s point),.the left second intercostal space at the upper left sternal border (pulmonary valve),.the right second intercostal space at the upper right sternal border (aortic valve),. ![]() Normal heart sounds are the cardiac valves closing-the homeostatic heart heartbeat are auscultated (heard through a stethoscope) over:
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