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A case of silent posterior myocardial ischemia/left circulnflex artery obstruction detected by prominent U-wave in right precordial leads Kohichi Hasegawa 1 , Toyotaka Yada 1 , Junji Tanaka 1 , Keiji Tamura 1 , Yoshifumi Wada 1 , Shinichiro Tadaoka 1 , Shoso Nezuo 1 , Toshitami Sawayama 1 1Division of Cardiology, Department of Medicine, Kawasaki Medical School Keyword: 巨大陽性U波(prominent U-wave) , 無症候性後壁虚血(silent posterior myocardial ischemia) , 左回旋枝狭窄(left circumflex artery obstruction) pp.1259-1263
Published Date 1990/12/15
DOI https://doi.org/10.11477/mf.1404910067
  • Abstract
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A 64-year-old woman with a history of hyper-tension for ten years and of syncope 18 month previously visited our Division of Cardiology on 12 June, 1989. The S4 and mitral regurgitation were audible at the apex, and her electrocardiogram showed ST-depression in leads II, aVF, V5-6 and prominent U-wave (PU) in V1-3 when first seen. Then, she was thought to have a posterior myoca-rdial ischemia

PU in V1-3 diminished whereas T-wave increased after nitrate and Ca++ blocker. Ergometer exercise ECG showed ST-depression in II, III, aVF, V4-6 and PU with decreased T-wave in V2-3 with no apparent symptoms. Simultaneously, Tl-201 myocar-dial imaging demonstrated a transient posterior defect. A silent posterior myocardial ischemia was, therefore, confirmed. Coronary arteriograms demon-strated subtotal obstruction of the proximal left circumflex artery. and the peripheral site was filled by collaterals from the right coronary artery.

Angina-induced PU in the right precordial leads proved to be useful in detection of posterior myo-cardial ischemia, and this marker may also improve the possibility of detection of silent posterior is-chemia.


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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