Excitation of the double chamber right ventricle: Electrophysiologic and anatomic correlation

Craig J. Byrum, Macdonald Dick, Douglas M. Behrendt, Paul Hees, Amnon Rosenthal

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


To examine the excitation of the double chamber right ventricle and the possibility that it results from a displaced, hypertrophied moderator band, seven patients with double chamber right ventricle were studied. All seven had pre- and postoperative electrocardiograms. Intraoperative right ventricular epicardial maps were obtained in three; right ventricular endocardial activation maps performed at postoperative catheterization were obtained in four. In the three patients studied at operation the breakthrough point of right ventricular epicardial activation was demonstrated in a normal inferior location well below the obstructing muscle band. Two patients with right bundle branch block after operation and two others with only right ventricular conduction delay on postoperative electrocardiogram demonstrated high normal right ventricular time with prolongation of activation in the right ventricular outflow or inflow region, or both, suggesting only peripheral injury. These data suggest that activation of the double chamber right ventricle is similar to that of the normal heart. In addition, the observed normal activation sequence militates against the hypothesis that the moderator band is the obstructing bundle.

Original languageEnglish (US)
Pages (from-to)1254-1258
Number of pages5
JournalThe American journal of cardiology
Issue number5
StatePublished - Apr 1 1982
Externally publishedYes

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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