The third heart sound or S3 is a rare extra heart sound that occurs soon after the normal two "lub-dub" heart sounds (S 1 and S 2). S 3 is associated with heart failure.

This is the sound of the S3 heart sound. It is heard normally in young adults and children, in pregnancy and athletes. It is abnormal older adults and may signify heart failure or...

The presence of an S 3 is the most sensitive indicator of ventricular dysfunction. Any cause of a significant increase in the volume load on the ventricle (s) can cause an S 3.

Aug 31, 2022 · The S3 heart sound occurs as the mitral valve opens and allows blood to fill the left ventricle passively. The sound happens as a result of blood striking the left ventricle during …

Sep 3, 2025 · By interpreting heart sounds, clinicians can identify normal cardiac function, valve closures, and detect early signs of heart disease. Understanding S1, S2, S3, and S4 sounds, …

Dec 2, 2024 · A third heart sound, or S3, is a low-pitched extra heart sound classically associated with heart failure, although it may be normal in children and young adults.

Dec 26, 2024 · Discover the key differences between S3 and S4 gallops, how they’re detected during a cardiac exam, and what they can reveal about heart failure, volume overload, and …

Feb 1, 2024 · A diastolic knock is a loud, high-pitched, thudding sound that occurs at the same time as S3. It indicates the sudden cessation of rapid ventricular filling due to the presence of …

Nov 10, 2022 · The third heart sound (S3) is a low-frequency sound best heard with the stethoscope bell, pressed lightly on the skin. A third heart sound occurs early in diastole.

The third heart sound (S3), also known as the “ventricular gallop,” occurs just after S2 when the mitral valve opens, allowing passive filling of the left ventricle.