Coronary endothelial dysfunction is known to be related with adverse cardiovascular outcome. We obtained a long-term follow-up of patients without significant coronary atherosclerosis, complaining of chest pain, in whom intra-coronary acetylene testing was performed in order to assess endothelial function. The study included 41 patient (35 with endothelial dysfunction, 6 with preserved endothelial function). Events considered as adverse outcome were cardiovascular death, acute myocardium-dial infarction, unstable angina pectoris, percutaneous coronary intervention, coronary-aortic by-pass grafting, ischemic stroke and peripheral artery re-vascularization. A high cardiovascular event rate was observed in patients with and without endothelial dysfunction, 34,3% and 50% respectively. Adverse outcome was related not only to endothelial dysfunction but also to traditional cardiovascular risk factors. Thus, evaluation of endothelial function or its determinants seems to be helpful in identifying a subgroup of patients at high risk.
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