Related Experiment Video
Updated: Mar 6, 2026

Murine Fetal Echocardiography
Published on: February 15, 2013
Detecting the gallop: the third heart sound and its significance
Subha Ramani1, Brittany N Weber2
1Brigham and Women's Hospital, Boston, MA, USA sramani@bwh.harvard.edu.
No abstract available in PubMed .
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Heart Sounds
Auscultation is the process of listening to these internal body sounds using a stethoscope. The heart produces four types of sounds, but only two—S1 and S2—can usually be heard with a stethoscope.
S1, also known as the "lub" sound, is caused by the closure of atrioventricular (A-V)...
Cardiovascular System Abnormal Findings II: Auscultation
Abnormal Heart Sounds
Gallops:
Assessment of the Cardiovascular System IV: Auscultation
Normal Heart Sounds
S1 (First Heart Sound)-
S1 is made by the closure of the mitral and tricuspid valves (atrioventricular valves), marking the beginning of systole.
S2 (Second Heart Sound)-
S2 is made by the closure of the aortic and pulmonic valves (semilunar valves), marking the end of the systole.
Cardiovascular System Abnormal Findings I: Inspection and Palpation
Abnormal findings observed during an inspection
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