201
Tl images in patients with
Tl
perfusion image can be detected in most patients with Tl perfusion image also may be associated with chest pain and/or chest Tl perfusion defect may be presented with R, PR, or RR in patients with MB. The significance of three different perfusion defects patterns (R, PR, and RR) may represent the various severity of perfusion insufficiency induced by MB. Key words: myocardial bridge, myocardial ischemia,
201
Tl perfusion image
Ann Nucl Med Sci 2005;18:9-16
Received 8/30/2004; revised 11/4/2004; accepted 11/12/2004. For correspondence or reprints contact: Chiung-Zuan Chiu, M.D., Section of Cardiology, Shin-Kong Wu Ho-Su Memorial Hospital, 95 Wen Chan Road, Taipei 111, Taiwan. Tel: (886)2-28332211 ext. 2084, Fax: (886)2-28369133, E-mail: juice243@hotmail.com
Myocardial bridge (MB) is a congenital anomaly occurred in 15%-85% people on autopsy and 0.5%-16%
Chiu CZ et al
patients on coronary angiography (CAG). The bridge formation is an anatomic arrangement in which an epicardial coronary artery becomes engulfed for a limited segment by myocardial fibers. In clinical situation, it describes an angiographic entity: a systolic narrowing of a coronary artery, mainly the left anterior descending (LAD) artery, responsible for a milking effect [1-5]. Although it is still controversial whether MB contributes to myocardial ischemia, there are patients who have clinical symptoms and signs of myocardial ischemia associated with MB during exercise and/or rest. MB may be concomitant clinically with myocardial ischemia, coronary spasm, arrhythmia, acute myocardial infarction, and sudden cardiac death [6-9]. Patients with MB may also experience the symptoms of angina pectoris with chest tightness and/or pain. Its clinical presentations and changes on electrocardiogram (ECG) overlap with those with coronary artery disease (CAD). So 201Tl myocardial perfusion imaging may be a tool recommended to identify the severity of myocardial ischemia in patients with MB. Few articles discussed about this issue before. The goal of this study is to do a retrospective analysis about the changes in

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