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Transient abnormal Q waves under acute myocardial infarction in patients with pneumoconiosis Kenji Iizuka 1 , Hajime Takahashi 1 , Shigeo Kakinoki 1 1Department of Cardiovascular Medicine, Iwamisawa Worker's Accidents Hospital Keyword: 急性心筋梗塞(acute myocardial infarction) , 一過性異常Q波(transient abnormal Qwaves) , じん肺(pneumoconiosis) pp.253-256
Published Date 1990/3/15
DOI https://doi.org/10.11477/mf.1404900113

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  • Abstract
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Abnormal Q waves have been generally consid-ered to be one of the most reliable indicators of per-manent myocardial cell death, namely myocardial infarction. Pathological and experimental studies also support this concept. However, some cases of abnormal Q waves disappearing after myocardial infarction have been reported.

Recently, we observed acute myocardial infarction with pneumoconiosis. In this case, a patient with abnormal Q waves appeared within 24 hours after the onset of acute myocardial infarction. But, thir-teen days later, these abnormal Q waves disappea-red on the surface twelve-lead ECG.

The precise mechanism for regression or disappear-ance of abnormal Q waves is not yet well known. Several studies pointed out a relation of this phe-nomenon to myocardial collateral circulation under ischemia. And, Nonkin et al reported that, patients with chronic lung disease such like pneumoconiosis, had high incidence of collateral circulation to the myocardium. This was due to chronic hypoxic conditions.

In our case, cineangiographic study could not be perfomed, but disappearence of abnormal Q wave (so called Transient abnormal Q waves), following acute myocardial infarction may be related to the presence of chronic lung disease.


Copyright © 1990, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1200 印刷版ISSN 0452-3458 医学書院

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