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为了解２０１Ｔｌ再注射及再注射后延迟显像对心肌存活的检测能力，对６２例心肌梗塞患者进行了２０１Ｔｌ运动、３～５小时再分布、２０１Ｔｌ再注射后１６～３５分钟及再注射后１２～１９小时延迟心肌断层显像。１５例患者于显像后行经皮冠状动脉腔内成形术（ＰＴＣＡ），并于ＰＴＣＡ后重复运动再分布心肌显像。结果：６２例患者运动再分布显像共有１２６个不可逆缺损节段，其中４８个节段再注射后１６～３５分钟出现放射性填充，心肌存活检出率为３８１％（４８／１２６）；５１个节段再注射后延迟显像出现再分布，心肌存活检出率为４０５％（５１／１２６）。两种显像方案的检出率差异无显著性（χ２＝０１６，Ｐ＞００５），但两者结合６２个节段示有放射性填充，心肌存活检出率可提高到４９２％（６２／１２６）。１５例患者ＰＴＣＡ前共检出１７个心肌存活节段，术后１２个节段２０１Ｔｌ灌注改善，阳性预测率为７０６％；ＰＴＣＡ前检出１１个梗塞节段，术后９个节段２０１Ｔｌ摄取无改善，阴性预测率为８１８％。结果表明：２０１Ｔｌ再注射与延迟显像心肌存活检出率无明显差别，但两者联合应用可提高检出率。
In order to understand the ability of TLD to detect myocardial viability after 201Tl reperfusion and reperfusion, 201Tl exercise was performed in 62 patients with myocardial infarction, redistributed within 3 to 5 hours, 16 to 35 minutes after 201Tl re-injection, and 12 ~ 19 hours delayed myocardial imaging. Fifteen patients underwent percutaneous transluminal coronary angioplasty (PTCA) after imaging, and were subjected to repeated exercise-redistribution myocardial imaging after PTCA. RESULTS: There were 126 irreversible defect segments in 62 patients with motion-redistribution imaging. Radiographic filling occurred in 16 to 35 minutes after re-injection in 48 segments. The detection rate of myocardial survival was 38.1% (48/126) After reperfusion of 51 segments, delayed imaging appeared redistribution, and the detection rate of myocardial survival was 405% (51/126). There was no significant difference in the detection rates between the two imaging modalities (χ2 = 016, P> 005), but the combination of the two showed radioactive filling in 62 segments. The detection rate of myocardial survival increased to 49%. 2% (62/126). Seventeen myocardial surviving segments were detected in 15 patients before PTCA. The perfusion of 201Tl was improved in 12 segments after PTCA, the positive predictive value was 70.6%. Eleven infarcted segments were detected before PTCA and nine segments 201Tl no improvement, negative predictive rate was 81 8%. The results showed that there was no significant difference in the detection rate of myocardial viability between 201Tl reperfusion and delayed imaging, but the combination of the two could improve the detection rate.