Objective: To determine whether the presence of well-developed collateral vessels (visualized by baseline angiography) prevents myocardial ischemia associated with electrocardiographic ST-segment deviation or anginal pain during subsequent coronary balloon occlusion.
Methods: Study patients with stable effort angina but without complete coronary obstruction were divided into two groups on the basis of whether myocardial ischemia was observed during the first minute of coronary balloon occlusion in order to compare the degrees of collateral development at baseline. Patients in group A (n = 47) had electrocardiographic ischemic ST-segment deviations or angina, or both, during balloon inflation, whereas patients in group B (n = 13) had neither.
Results: The incidences both of poor anterograde perfusion with TIMI grade 1 or 2 (77 versus 38%, P < 0.05) and of well-developed collateral vessels (Rentrop grade 3) in the perfusion territory of the target vessel for coronary angioplasty (77 versus 15%, P < 0.01) were higher for patients in group B than they were for those in group A. The incidence of no myocardial ischemia during balloon inflation among the patients with well-developed collateral vessels was higher than that among those without (59 versus 7%, P < 0.01). The prediction of the absence of myocardial ischemia during balloon inflation according to whether well-developed collateral vessels were present had the sensitivity 77% (10 of 13) and the specificity 93% (40 of 43) for the study patients.
Conclusion: Absence of myocardial ischemia (revealed by electrocardiographic changes or angina during transient coronary balloon occlusion) was associated with presence of well-developed collateral vessels (Rentrop grade 3; visualized by baseline angiography), suggesting that the patients with well-developed collateral vessels have a low risk of developing acute myocardial infarction or hemodynamic instability upon abrupt closure of the culprit coronary artery.
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