OUTCOME AND RISK-FACTORS OF ISCHEMIC-HEART-DISEASE IN CHRONIC UREMIA

To determine the prognosis and risk factors for ischemic heart disease in chronic uremia, a cohort of 432 dialysis patients were followed pr ospectively from start of dialysis therapy until death or renal transp lantation. Baseline demographic, clinical and echocardiographic data w ere obtained. After the initiation of dialysis laboratory data were co llected at monthly intervals, and clinical and echocardiographic data at yearly intervals. Twenty-two percent of patients (N = 95) had eithe r a history of angina pectoris or myocardial infarction on starting di alysis therapy. Median time to onset of heart failure was 24 months in those with ischemic heart disease on initiation of dialysis, compared to 55 months in those without (P < 0.0001). This effect was independe nt of age, diabetes and underlying cardiomyopathy. Median survival was 44 months in those with ischemic disease compared to 56 months in tho se without (P = 0.0001). This adverse impact was independent of age an d diabetes mellitus but, when cardiac failure was added to the Cox's m odel, ischemic heart disease was no longer an independent predictor of survival. De novo ischemic heart disease, not evident on starting dia lysis therapy, occurred in 41 (9%) patients. When compared to patients who never developed ischemic disease (N = 296; 69%), significant and independent predictors of de novo disease were older age (P = 0.0007), diabetes mellitus (P = 0.0001), high blood pressure during follow up on dialysis (P = 0.02) and hypoalbuminemia (P = 0.03), whereas anemia was not an independent predictor. LV mass index was 174 +/- 7 g/m(2) i n those who developed de novo ischemic disease compared to 155 +/- 3 g /m(2) (P < 0.001) in those who did not. Concentric LV hypertrophy, LV dilation and systolic dysfunction were independent risk factors for de novo ischemic heart disease. We conclude that ischemic heart disease occurs frequently in dialysis patients, that its adverse impact is med iated through the development of heart failure, and that the most impo rtant, potentially reversible risk factors are hypertension, hypoalbum inemia, and underlying cardiomyopathy.