Long-term clinical follow-up in patients with angiographic restudy after successful angioplasty.

BACKGROUND: Restenosis remains a critical limitation after coronary angioplasty. There is little information comparing long-term prognosis in patients who suffer from restenosis and others who do not. The purpose of this paper is to determine the clinical events in patients with restenosis or continued patency documented by restudy coronary arteriography. METHODS AND
RESULTS: The source of data was the clinical data base at Emory University. Patients who had previous coronary surgery and patients who underwent angioplasty in the setting of acute myocardial infarction were excluded. A total of 3,363 patients undergoing angiographic restudy 4 months to 1 year after angioplasty were compared with 3,858 not undergoing restudy. In the restudy population, 1,570 had restenosis and 1,793 had patent arteries at all sites dilated. The restenosis patients were older and had more hypertension, more diabetes, more severe angina, more multivessel coronary artery disease, more severe stenoses, and less satisfactory original results. At restudy, in patients without restenosis, 38.7% had angina versus 70.7% in patients with restenosis (p < 0.0001). There were few deaths in the first 6 months. At 6 years, the survival rate was 0.95 without restenosis and 0.93 with restenosis (p = 0.16). At 6 months and 6 years, freedom from myocardial infarction was 0.97 and 0.88 without restenosis and 0.93 and 0.85 with restenosis (p = 0.0001). On multivariate analysis, restenosis was an independent correlate of myocardial infarction but not mortality. At 6 months and 6 years, freedom from coronary bypass surgery was 0.99 and 0.94 without restenosis and 0.91 and 0.78 with restenosis (p < 0.0001). At 6 months and 6 years, freedom from repeat angioplasty was 0.96 and 0.76 without restenosis and 0.44 and 0.20 with restenosis (p = 0.0001). The highest event rates were noted in the patients with restenosis with recurrent chest pain. Patients not undergoing restudy differed somewhat from the study group, and there were far fewer repeat revascularization procedures in the group not undergoing restudy.
CONCLUSIONS: Patients with restenosis are more likely to have recurrent angina pectoris. Although there is no or little difference in survival, there is a difference in myocardial infarction rate in the patients with and without restenosis. The low myocardial infarction and death rates in the group suffering restenosis may be related to repeat revascularization in these patients; the principal events in the restenosis population are frequent repeat revascularization procedures.