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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.
An echocardiogram is a test that uses high-frequency. sound waves (ultrasound) to check your heart. The sound. waves bounce (or âechoâ) off structures in your heart, and. the echoes are shown as images on a monitor. A stress echocardiogram compares your heart when it is at. rest and when it is working hard.