PMID: 6160528May 1, 1980Paper

Fascicular premature beats with narrow QRS in the presence of bundle-branch block

Pacing and Clinical Electrophysiology : PACE
K VenkataramanM Bilitch

Abstract

The electrocardiogram of a sixty-two-year-old male revealed right bundle-branch block, left anterior superior fascicular block, and right precordial Q waves consistent with anteroseptal myocardial infarction. Premature beats with narrow QRS (100 ms) occurred intermittently; coupling intervals varied between 560-600 ms. His bundle electrogram confirmed the fascicular origin of the premature beats. During atrial prematuring studies, it was shown that an appropriately timed premature beat could prolong infra-His conduction time, but QRS normalization was not achieved. The possible electrophysiologic mechanisms that could result in a normal QRS complex with fascicular premature beats in this patient are discussed; a new mechanism is suggested.

References

Jun 1, 1971·Circulation·A N Damato, S H Lau
Jul 1, 1969·Journal of Electrocardiology·M B Rosenbaum
May 1, 1973·Archives of Internal Medicine·K M RosenS H Rahimtoola
Jun 1, 1973·British Heart Journal·P K GuptaK Chadda
Feb 1, 1971·The American Journal of Medicine·O S NarulaR P Javier
Jul 1, 1971·Circulation·T N James, L Sherf
Jan 1, 1969·Circulation·B J ScherlagA N Damato
Jul 1, 1968·Circulation·G K MoeJ Merideth

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Citations

Apr 1, 1985·Journal of the American College of Cardiology·R RuffyR Lal
Jul 1, 1981·Pacing and Clinical Electrophysiology : PACE·D L HayesJ Fetter
Sep 1, 1981·Pacing and Clinical Electrophysiology : PACE·A M Abrahamsen, T Aarsland

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