His bundle electrocardiography in manifest and concealed right bundle branch extrasystoles

Agustin Castellanos, Ruey J. Sung, Stephen M. Mallon, Ali Ghahramani, Federico Moleiro, Robert J. Myerburg

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


His bundle electrocardiography was helpful in the diagnosis of impulse formation in the right bundle branch. Ten patients with narrow QRS complexes had ectopic beats with an "incomplete" left bundle branch pattern and almost simultaneous activation of His bundle and ventricles. Both QRS morphology and H--V intervals depended on the more proximal or distal location of the ectopic focus. In four patients with "complete" right bundle branch block the morphology of ectopic ventricular complexes and H--V intervals also depended on the presence or absence of retrograde block and differential degrees of forward and/or retrograde conduction delays. Nine patients with "complete" right bundle branch block and four with "complete" left bundle branch block had premature beats which could have originated in the proximal right bundle branch, proximal left bundle branch, or distal His bundle. In one patient with "complete" left bundle branch block, "concealed" His bundle depolarizations (probably originating in an ectopic focus located in the right bundle branch) produced pseudo Type II (Mobitz) A-V block. Although lidocaine appeared to have been more effective in patients with bundle branch block than in those with narrow QRS complexes, further studies are necessary to corroborate this impression.

Original languageEnglish (US)
Pages (from-to)307-315
Number of pages9
JournalAmerican Heart Journal
Issue number3
StatePublished - Sep 1977

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


Dive into the research topics of 'His bundle electrocardiography in manifest and concealed right bundle branch extrasystoles'. Together they form a unique fingerprint.

Cite this