Bozkurt M F, Yildirir A, Kabakçi G, Caner B
Department of Nuclear Medicine, Hacettepe University Faculty of Medicine, Ankara, Turkey.
Angiology. 2001 Feb;52(2):145-8. doi: 10.1177/000331970105200210.
Exercise-induced left bundle branch block (Ex-LBBB) is a rare entity encountered during exercise testing. The authors present a 53-year-old woman who developed intermittent Ex-LBBB asymptomatically during Tl 201 myocardial perfusion scintigraphy. Scintigraphic findings revealed septal-anteroseptal ischemia while the coronary arteriogram appeared normal. False-positive septal-anteroseptal scintigraphic findings suggesting ischemia in patients with persistent left bundle branch block (LBBB) is well known, but since the LBBB in this case was induced by exercise testing and was spontaneously terminated at rest, scintigraphic findings may be attributed to microcirculatory ischemia, which cannot be detected angiographically, as the cause of Ex-LBBB.
运动诱发的左束支传导阻滞（Ex-LBBB）是运动试验中罕见的情况。作者报告了一名53岁女性，在铊201心肌灌注闪烁扫描期间无症状地出现间歇性Ex-LBBB。闪烁扫描结果显示间隔-前间隔缺血，而冠状动脉造影显示正常。持续性左束支传导阻滞（LBBB）患者中提示缺血的间隔-前间隔闪烁扫描假阳性结果是众所周知的，但由于本例中的LBBB是由运动试验诱发的且在静息时自发终止，闪烁扫描结果可能归因于微循环缺血，这是血管造影无法检测到的，为Ex-LBBB的病因。
