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first heart sound

   Also found in: Acronyms 0.01 sec.
first heart sound
n.
The heart sound that occurs with ventricular systole and is produced mainly by closure of the atrioventricular valves.

first heart sound
S1 Cardiology A heart sound that occurs in systole, primarily produced by AV valve closure


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Other heart cavities were in normal size and their functions were normal On his physical examination blood pressure was 120/80 mmHg, heart rate 100 /min and first heart sound was decreased.
Laennec distinguished two heart sounds but attributed the first heart sound to ventricular systole and the second sound to atrial systole.
 
 
 
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