Borderline coronary lesions may lead to serious coronary events--long-term outcome in 65 conservatively treated patients.

Abstract The choice of optimal therapy in a patient with borderline coronary lesion is difficult. The long-term outcome of conservatively treated patients has not yet been well defined. To analyse long-term outcome in patients with a borderline lesion in a single coronary artery who were selected for conservative treatment. The study group consisted of 65 patients (mean age 59.4+/-7.4 years, 48 males) with (1) stable angina (CCS class I/II), (2) isolated single borderline coronary lesion (40-70% stenosis demonstrated by quantitative coronary angiography) and (3) no demonstrable ischaemia during non-invasive tests. Patients with heart failure, left ventricular ejection fraction