CORONARY ANGIOPLASTY OF BIFURCATIONAL LESIONS WITHOUT PROTECTION OF LARGE SIDE BRANCHES

To assess the risk and clinical relevance of side branch (SB) occlusion during angioplasty (PTCA) we attempted PTCA of major branches (MB) without protection of lesion-associated large (greater-than-or-equal-to 1.8 mm) SBs in 67 patients (50 men). There were 32 patients with unstable angina and 35 with stable angina. Their mean age was 55 years (range 31-77). There were 69 SBs: 43 with severe ostium stenosis (type A); 6 with severe non ostial stenosis (type B); and 20 with no or slight nonostial stenosis (type C). PTCA of the MB was successful in all but one patient who underwent acute bypass surgery. After MB PTCA occlusion occurred in 10 SBs (7A, 1B, 2C) and was asymptomatic in 5. Recanalization and dilatation was successful in 4 out of 5 symptomatic SB occlusions. A single patient developed a non-q wave myocardial infarction. PTCA was also attempted in 21 diseased SBs and failed in one. 21 SBs remained severely stenotic and 6 occluded. During follow-up symptomatic MB restenosis occurred in 12 patients, associated with restenosis in 4 out of 6 dilated SBs. Four patients underwent bypass surgery and 8 repeat successful PTCA. The SB was redilated in 2 cases and occluded silently in one. Angiography in 16 asymptomatic patients showed moderate MB restenosis in 3 and SB occlusion in 2. At 2.2 years follow-up 60 (89%) patients were asymptomatic with a normal exercise test and/or maintained angiographic result. Angioplasty of bifurcational lesions without SB protection can be effectively performed with a low rate of complications and a favourable long-term outcome. The clinical importance of dilating large SBs seems limited.