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[Abnormal Q wave in the right precordial leads unmasked during right bundle branch block in a patient with anteroseptal myocardial infarction: a case report].

Authors
  • Matsuki, A
  • Mizumaki, K
  • Fujiki, A
  • Asanoi, H
  • Nozawa, T
  • Hirai, T
  • Kameyama, T
  • Inoue, H
Type
Published Article
Journal
Journal of Cardiology
Publisher
Elsevier
Publication Date
Jun 01, 2000
Volume
35
Issue
6
Pages
439–444
Identifiers
PMID: 10884981
Source
Medline
License
Unknown

Abstract

Electrocardiography in a 77-year-old woman showed small R waves in leads V1-V3 3 hours after the onset of acute anteroseptal myocardial infarction. Abnormal Q waves appeared in leads V1-V3 only during intermittent right bundle branch block. The normal septal force disappeared after transmural septal infarction and a small force of right ventricle origin became apparent as a small R wave in V1. Right bundle branch block delayed activation of right ventricle, and thereby deleted the initial R wave and unmasked the Q wave of the septal infarction. Appearance of a Q wave in leads V1-V3 with right bundle branch block should not be assumed to reflect the extension of myocardial infarction.

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