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Symbol for fourth heart sound.
Farlex Partner Medical Dictionary © Farlex 2012
S41. Fourth heart sound, which corresponds to atrial contraction during presystole; it is rarely heard in normal hearts.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
Abbreviation for fourth heart sound.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012