Heart Sounds in Physiology: Mechanism, Timing and Clinical Significance in Cardiac Cycle
Автор: PHARMA TECHNOLOGY
Загружено: 2026-03-07
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Heart Sounds in Physiology: Mechanism, Timing and Clinical Significance in Cardiac Cycle
Heart sounds are the noises produced by the beating heart due to the closure of valves and the flow of blood during the cardiac cycle. In normal individuals, two primary heart sounds are heard with a stethoscope:
First Heart Sound (S1):
S1 is produced by the closure of the atrioventricular valves — the Mitral valve and Tricuspid valve — at the beginning of ventricular systole. It marks the start of contraction of the ventricles and is described as a “lub” sound.
Second Heart Sound (S2):
S2 is caused by the closure of the semilunar valves — the Aortic valve and Pulmonary valve — at the beginning of ventricular diastole. It marks the end of systole and produces the “dub” sound.
Additional heart sounds may also be heard in certain conditions:
S3: Associated with rapid ventricular filling.
S4: Associated with atrial contraction against a stiff ventricle.
Clinical Significance
Heart sounds are essential in diagnosing various cardiac conditions. Abnormalities such as murmurs, added sounds, or altered intensity may indicate valve disorders, heart failure, or structural defects. Careful auscultation helps assess valve function and overall cardiac health.
Hashtags
#heartsounds #CardiacCycle #S1S2 #Physiology #Cardiology #Auscultation #MitralValve #TricuspidValve #AorticValve #PulmonaryValve #MedicalEducation
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