Relationship between Serum Total Bilirubin Level and Cardiac Outcomes in Patients with Isolated Coronary Artery Ectasia

Abstract

Objective: This study aimed to investigate the association of admission serum bilirubin concentrations with major adverse cardiacevent (MACE) in isolated coronary artery ectasia (ICAE).Methods: This study enrolled 75 consecutive patients (42.7% women with the mean age of 52.3±11.4 years) with ICAE. MACE, basaldemographic, laboratory, angiographic parameters, and admission serum bilirubin concentrations were recorded on follow-upforms. MACE was defined as heart failure, nonfatal myocardial infarction, and cardiovascular death.Results: During follow-up (median 61±11 months), 19 (25.3%) patients experienced MACE. The patients were assigned into twogroups: with MACE and without MACE. Compared with the non-MACE group, the MACE group had significantly lower serum totalbilirubin levels. In addition, when the patients were subcategorized into tertiles of serum bilirubin concentrations, MACE wereidentified in 11 patients in the first tertile, 7 patients in the second tertile, and 1 patient in the third tertile. In the Cox regressionanalyses, serum total bilirubin and C-reactive protein (CRP) were found as independent risk factors for MACE (p