(Circulation. 1996;93:253-258.)
© 1996 American Heart Association, Inc.
Articles |
Coronary Thrombi Increase PTCA Risk
Angioscopy as a Clinical Tool
From the Department of Internal Medicine, Section on Cardiology, Ochsner Clinic and Alton Ochsner Medical Foundation, New Orleans, La; the Arizona Heart Institute and Foundation, Phoenix (R.R.H.); the Scripps Clinic and Research Foundation, La Jolla, Calif (P.S.T.); the Montreal (Quebec) Heart Institute (R.B.); Cardiology Associates, Lubbock, Tex (P.D.W.); and Herman Hospital, Houston, Tex (R.W.S.).
Background The presence of angiographically identified intracoronary thrombus has been variably associated with complications after coronary angioplasty. Angiography has been shown to be less sensitive than angioscopy for detecting subtle details of intracoronary morphology, such as intracoronary thrombi. The clinical importance of thrombi detectable by angioscopy but not by angiography is not known.
Methods and Results Percutaneous coronary angioscopy was performed in 122 patients undergoing conventional coronary balloon angioplasty (PTCA) at six medical centers. Unstable angina was present in 95 patients (78%) and stable angina in 27 (22%). Therapy was not guided by angioscopic findings, and no patient received thrombolytic therapy as an adjunct to angioplasty. Coronary thrombi were identified in 74 target lesions (61%) by angioscopy versus only 24 (20%) by angiography. A major in-hospital complication (death, myocardial infarction, or emergency bypass surgery) occurred in 10 of 74 patients (14%) with angioscopic intracoronary thrombus, compared with only 1 of 48 patients (2%) without thrombi (P=.03). In-hospital recurrent ischemia (recurrent angina, repeat PTCA, or abrupt occlusion) occurred in 19 of 74 patients (26%) with angioscopic intracoronary thrombi versus only 5 of 48 (10%) without thrombi (P=.03). Relative risk analysis demonstrated that angioscopic thrombus was strongly associated with adverse outcomes (either a major complication or a recurrent ischemic event) after PTCA (relative risk, 3.11; 95% CI, 1.28 to 7.60; P=.01) and that angiographic thrombi were not associated with these complications (relative risk, 0.85; 95% CI, 0.36 to 2.00; P=.91).
Conclusions The presence of intracoronary thrombus associated with coronary stenoses is significantly underestimated by angiography. Angioscopic intracoronary thrombi, the majority of which were not detected by angiography, are associated with an increased incidence of adverse outcomes after coronary angioplasty.
Key Words: angioplasty • occlusion • thrombus • angioscopy
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