S3 gallop


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Related to S3 gallop: S4 gallop

S3 gallop

Third heart sound Cardiology The heart sound that coincides with the onset of a low frequency diastolic wave generated by rapid filling; the SG is best heard at the apex of the left lateral decubitus position; the SG indicates ↓ ventricular compliance, and is characteristic of CHF; 'physiologic' SGs occur in children and young adults. See Congestive heart failure.