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S7 gallop -->
gallop rhythm in which the gallop sound is due to superimposition of third and fourth heart sounds; sometimes heard in normal subjects with tachycardia, but usually indicative of myocardial disease.
Synonym: s7 gallop, S7.
systolic gallop, obsolete term for a triple cadence to the heart sounds in which the extra sound occurs during systole, usually in the form of a systolic click.