Abstract
BACKGROUND: Previous studies depict low cardiac event and mortality rates in patients with angiographically normal coronary arteries. These studies, however, are limited by small sample sizes, short follow-up intervals, and selection biases. This study was undertaken to determine the natural five-year course of a diverse cohort of subjects with documented normal coronary arteries with respect to coronary heart disease development, revascularization need, and all-cause mortality. METHODS: Consecutive adult patients with angiographically normal coronary arteries were followed up for 5 years through medical record review. Patients with any degree of angiographic abnormality, including minimal luminal irregularity or non-critical stenosis, were excluded. Patients were not excluded based on age, co-morbidities (except cardiac transplant and structural heart disease), indication for angiogram, or initial hospitalization status. RESULTS: Normal coronary arteries were found in 182 (31.3%) of 582 patients; 129 met all inclusion criteria. The mean age was (49.1±12.5) years; 47 (36.7%) were male and 75 (58.1%) were caucasian. The most common indication for angiography was cumulative risk factors (60.5%). Within 5 years of a normal angiogram, 13 of 129 patients died (10.1%; 95 CI 5.7%-16.9%). Six (40%; 95 CI 19.8% to 64.3%) of 15 patients undergoing repeat angiogram within five years developed new coronary heart disease, with one requiring revascularization. Of traditional risk factors of coronary heart disease, only diabetes was associated with a higher risk of death. CONCLUSION: The natural five-year course of a diverse cohort of patients with documented normal coronary arteries suggests that there is significant risk for death and development of coronary heart disease.