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Symbol for first heart sound.
Farlex Partner Medical Dictionary © Farlex 2012
S1First heart sound, which corresponds to the closure of the mitral and tricuspid valves, which is a long, low, “lubb” that occurs during systole. See S2, S3, S4.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
Abbreviation for first heart sound.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012