[Abnormal Q wave in the right precordial leads unmasked during right bundle branch block in a patient with anteroseptal myocardial infarction: a case report].
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.
Matsuki
A
A
Second Department of Internal Medicine, Faculty of Medicine, Toyama Medical and Pharmaceutical University.
Mizumaki
K
K
Fujiki
A
A
Asanoi
H
H
Nozawa
T
T
Hirai
T
T
Kameyama
T
T
Inoue
H
H
D000368:Aged; D002037:Bundle-Branch Block / Q000150:complications* / Q000503:physiopathology*; D004562:Electrocardiography; D005260:Female; D006801:Humans; D009203:Myocardial Infarction / Q000150:complications* / Q000503:physiopathology*