Ischemia-modified albumin predicts mortality in ESRD

Abstract

Background: The primary study aim is to determine whether ischemia-modified albumin (IMA) levels predict mortality in patients with end-stage renal disease (ESRD). The secondary aim is to determine characteristics of patients with elevated IMA levels.

Methods: A prospective observational study of 114 renal transplantation candidates was performed. All underwent coronary angiography and dobutamine stress echocardiography. The primary end point is total mortality.

Results: During a follow-up period of 2.25 +/- 0.71 years, there were 18 deaths; 10 were cardiac related. Diabetes, severe coronary artery disease, positive dobutamine stress echocardiography result, cardiac troponin T (cTnT) level, IMA level, left ventricular (LV) end-systolic diameter, LV ejection fraction, left atrial size, and mitral peak velocity of early filling (E)/early diastolic velocity (Ea) ratio all predicted mortality. The receiver operating characteristic area under the curve for mortality prediction was similar for IMA and cTnT levels. An IMA level of 95 KU/L or greater (n = 46) predicted mortality with a sensitivity of 76% and specificity of 74%. cTnT level of 0.06 ng/mL or greater (> or = 0.06 microg/L; n = 51) predicted mortality with a sensitivity of 75% and specificity of 72%. Thirty-eight patients (33%) had both IMA and cTnT levels elevated. With multivariate analysis, a positive dobutamine stress echocardiography result (P = 0.003), combined elevated IMA and cTnT levels (P = 0.005), and E/Ea ratio (P = 0.009) were independent prognostic factors. IMA and cTnT levels alone were not independent predictors of mortality. Patients with an elevated IMA level had a significantly larger LV size, decreased LV systolic function, and greater E/Ea ratio compared with those without an increased level.

Conclusion: IMA level predicts mortality in patients with ESRD. Patients with elevated levels have larger LV size, decreased systolic function, and greater estimated LV filling pressures.