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S1 Heart Sounds and Murmurs | First Heart Sound | Dr Najeeb

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▬▬▬▬▬▬▬▬▬▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬
00:00:00 Introduction
00:01:31 Heart structure and concept of heart cycle
00:09:35 Mechanism of genesis of S1 and concept of vibration
Components of first heart sound S1
Does the opening of valves produce sound?
Opening snap, clicks


The first heart sound (S1) represents closure of the atrioventricular (mitral and tricuspid) valves as the ventricular pressures exceed atrial pressures at the beginning of systole (point a). S1 is normally a single sound because mitral and tricuspid valve closure occurs almost simultaneously.

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