| summation | The act of summing, or forming a sum, or total amount; also, an aggregate. "Of this series no summation is possible to a finite intellect." (De Quincey) Origin: Cf. F. Sommation. See Sum. Source: Websters Dictionary (01 Mar 1998) |
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| summation beat | A beat triggered by more than a single electrical impulse, when the wave fronts coincide to act together on a single final pathway of activity; in the electrocardiogram, the atrial or ventricular complex when either atria or ventricles are activated jointly by two simultaneous or nearly simultaneous invading impulses. Synonym: combination beat, mixed beat, summation beat. (05 Mar 2000) |
| summation 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." (05 Mar 2000) |
| summation of stimuli | Cumulative muscular or neural effects produced by the frequent repetition of stimuli. (05 Mar 2000) |