S3

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S3

Symbol for third heart sound.

S3

the third heart sound in the cardiac cycle. Normally, it is audible only in children and physically active young adults and usually disappears with age. In older people, it is an abnormal finding and usually indicates myocardial failure. It is heard with the bell of a stethoscope placed lightly over the apex of the heart with the patient lying down and facing left. A weak, low-pitched, dull sound, it is thought to be caused by vibrations of the ventricle walls when they are suddenly distended by blood from the atria. Also called physiological third heart sound, ventricular gallop.

S3

Third heart sound, a soft prolonged sound, which corresponds to vibrations in the wall of the ventricle caused by rapid filling of same; the S3 is normal in young athletes, but is usually abnormal.

S3

Abbreviation for third heart sound.
References in periodicals archive ?
And the S-3 has the opportunity to break down barriers that may be hindering team progress.
It provides the S-3 with the opportunity to consider the material, conduct research, and think.
In overseeing both the S-3 section and the SPO section, the operations officer was able to stay ahead of the battalion commander on brigade-level support issues.
Having one point of contact also prevented the S-3 and SPO sections from being unaware that they were both working the same issue.