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reciprocal beat a heartbeat resulting from an atrial or ventricular complex caused by a return of an impulse to its chamber of origin; called also echo beat. sinus beat a heartbeat with sinus rhythm. ventricular beat an ectopic beat originating in a ventricle.
coupled rhythm heart beats occurring in pairs, the second beat of the pair usually being a ventricular premature beat. delta rhythm. 1. electroencephalographic waves having a frequency below 3Â½ per second, typical in deep sleep, in infancy, and in serious brain disorders. See also electroencephalography. 2. delta waves.. atrioventricular junctional rhythm. 2. junctional rhythm. nyctohemeral rhythm a day and night rhythm. pendulum rhythm alternation in the rhythm of the heart sounds in which the diastolic sound is equal in time, character, and loudness to the systolic sound, the beat of the heart resembling the tick of a watch.