Would you like a similar review of S2, splitting patterns, or murmurs?
The first heart sound, , is the familiar "lub" in the heart’s "lub-dub" rhythm. It signals the official start of systole —the phase when your heart contracts to pump blood to the rest of the body. 💓 The Basics: What is S1? s1 heart sounds
As the ventricles begin to contract, the pressure within them rapidly rises. When this ventricular pressure exceeds the pressure in the atria, the AV valves slam shut to prevent the backflow of blood. This mechanical closure, combined with the subsequent tensing of the chordae tendineae and the vibrations of the ventricular walls, creates the audible "lub" heard during auscultation. Heart Sounds and Murmurs - UTMB Would you like a similar review of S2,
The S1 sound is often described as a "lub" and is the first of the two main heart sounds that can be heard with a stethoscope during auscultation. 💓 The Basics: What is 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.
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?