This study aimed at assessing the value of 20IT1 scans to detect restenosis following coronary stent implantation. Of 47 patients who had a coronary stent implantation, 38 with 44 stent implants underwent stress perfusion imaging and repeat coronary angiography 3 months after the procedure. The angiographic restenosis rate was 31.8%. A perfusion defect on stress image which showed redistribution at rest was considered a positive scan. Thallium scans were found to have a sensitivity of 71% and a specificity of 93.3%. A nonreperfusing defect was observed in all false-negative studies. Normal myocardial perfusion always co-existed with the patent stents, with no significant luminal compromise. An unimpaired perfusion on scan strongly suggested adequate patency of the stented arterial segment.

Keywords:
Coronary stent patency, Restenosis detection, Thallium-201
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1994
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