Third heart sound
Third heart sound
The Third heart sound or S3 is a rare heart sound that occurs soon after the "lub-dub" (S1 and S2) of the cardiac cycle. It is also known as a ventricular gallop or a protodiastolic gallop due to its occurrence early in diastole.
Pronunciation
The third heart sound is pronounced as "S-three" or "ess-three".
Etymology
The term "Third heart sound" is derived from its position in the sequence of heart sounds. It is the third audible sound in the cardiac cycle, following the first (S1) and second (S2) heart sounds.
Related Terms
- Cardiac cycle: The sequence of events that occur when the heart beats.
- Diastole: The phase of the heartbeat when the heart muscle relaxes and allows the chambers to fill with blood.
- Systole: The phase of the heartbeat when the heart muscle contracts and pumps blood from the chambers into the arteries.
- Heart murmur: An unusual sound heard between heartbeats.
- Heart sounds: The noises generated by the beating heart and the resultant flow of blood through it.
See Also
References
External links
- Medical encyclopedia article on Third heart sound
- Wikipedia's article - Third heart sound
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