A gallop rhythm refers to a (usually abnormal) rhythm of the heart on auscultation. The normal heart rhythm contains two audible sounds, called S1 and S2, giving the well-known "lub-dub" rhythm. They are caused by the closing of valves in the heart. A gallop rhythm contains another sound, called S3 or S4, dependent upon where in the cycle this added sound comes; it can also contain both of these sounds.
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Rhythm a measured movement; the recurrence of an action or function at regular intervals.rhyth´micrhyth´mical alpha rhythm electroencephalographic [more]Gallop rhythm - Community and Resources
Noun 1. cardiac rhythm characterized by the presence of an extra sound; can indicate a heart abnormality (synonym) cantering rhythm (hypernym) cardiac arrhythmia, arrhythmia
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