third heart sound
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Related to third heart sound: fourth heart sound
third heart sound (S3),
occurs in early diastole and corresponds with the end of the first phase of rapid ventricular filling; normal in children and younger people but abnormal in others.
Synonym(s): third sound
Farlex Partner Medical Dictionary © Farlex 2012
third heart soundS3 gallop, ventricular gallop Cardiology An extra heart sound traditionally regarded as a sign of left ventricular systolic dysfunction–heart failure; its significance differs according to the valve involved and the type of underlying defect; it is caused by rapid ventricular filling, and best heard over the apex with the Pt in supine or left lateral position; it ↑ with inspiration, exercise, elevation of legs, ↑ venous return. Cf Fourth heart sound.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
third heart sound(S3) (thĭrd hahrt sownd)
Occurs in early diastole and corresponds with the end of the first phase of rapid ventricular filling; normal in children and younger people but abnormal in others.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012