atrioventricular (AV) junctionalbigeminy

a·tri·o·ven·tric·u·lar (AV) junctionalbigeminy

(ā'trē-ō-ven-trik'yū-lăr jungk'shŭn-ălbī-jem'i-nē) Paired beats, each pair consisting of an AV nodal extrasystole coupled to a beat of the dominant, usually sinus, rhythm.