reciprocating rhythm

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re·cip·ro·cat·ing rhyth·m

a cardiac arrhythmia initiated by an AV junctional beat followed in turn by a reciprocal beat; the descending impulse of the reciprocal beat, before reaching the ventricles, is also reflected backward to the atria, but before reaching the atria is reflected downward again to the ventricles, so that there is both retrograde atrial activation and orthograde ventricular activation.
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