一位52歲男性，一年前曾接受過心導管的檢查及氣球擴張術，被轉介至核子醫學部接受鉈-201催迫性心肌灌注單一光子放射電腦斷層攝影，評估是否有心肌缺氧。病人在休息狀態時，心臟房室傳導均為正常；但是病人在履帶式運動結束約一分鐘後，出現完全性房室傳導阻滯約9.5秒而引發暈厥現象。病人的鉈-201催迫性心肌灌注單一光子放射電腦斷層攝影及冠狀血管攝影，均顯示無心臟缺血之變化。因此在本病案中，由於運動而引發的完全性房室傳導阻滯，可能肇因於藥物的作用、自律神經不平衡、或心臟傳導系統的疾病。

　　　　　A 52-year-old man with normal atrioventricular (AV) conduction at rest who underwent percutaneous coronary angioplasty one year ago, was referred for a myocardial perfusion stress test for evaluation of possible ischemia. Complete AV block with long pause (9.5seconds) and syncope developed one minute after termination of exercise. Thallium-201 SPECT and coronary angiogram did not show significant ischemia. The cause of exercise-induced complete AV block in this case may be attributable to drug effect, autonomic imbalance or conduction disease.