The , colloquially known as the "lub" of the classic "lub-dub," is the first major acoustic event in the cardiac cycle. It is primarily a high-pitched sound that marks the transition from mechanical diastole (rest) to ventricular systole (contraction). Physiology: What Produces S1?
S1 heart sounds, also known as the first heart sound, is a crucial component of the cardiac cycle. It is primarily caused by the closure of the atrioventricular valves (mitral and tricuspid valves) at the beginning of systole. s1 heart sounds
In a normal cardiac cycle, the sequence of heart sounds is: The , colloquially known as the "lub" of
S1 is generated by the sudden closure of the —the mitral valve and the tricuspid valve —at the onset of ventricular systole. S1 heart sounds, also known as the first
Here are some key points about S1 heart sounds: