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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.
Echo is a sound reflected off of a surface.   An echo is the mere reflection of the Alpha signal, and will always  be weaker than the Alpha due to the absorption of wave â¦ energy off  reflected surfaces.