Dialysis in The Netherlands: the clinical condition of new patients put into a European perspective. NECOSAD Study Group. Netherlands Cooperative Study on the Adequacy of Dialysis phase 1

BACKGROUND: The unadjusted annual mortality rate among prevalent Dutch dialysis patients increased from 1981 to 1992. Part of this increase may be attributed to the ageing of the dialysis population, but hardly any data were available on other important prognostic features of new Dutch dialysis patients, such as co-morbidity and other aspects of their clinical condition. The aim of the present study was to obtain these data and to put them into a European perspective. METHODS: Two hundred and fifty consecutive new patients were included in this prospective multi-centre study. Data were collected 3 months after start of dialysis. Multivariate linear regression analysis was used to explain the variability of parameters of nutritional state and blood pressure. RESULTS: Mean age was 57 years, co-morbid conditions were present in 51%, diabetes mellitus in 18%, and cardiovascular disease in 28%. Decreased protein intake was related to diminished residual renal function. Our patients did not have more co-morbidity than Dutch patients participating in a European study some years earlier. Comparison with other studies was complicated by the use of different definitions of co-morbidity and of selected patient populations. CONCLUSIONS: Despite the fact that Dutch dialysis patients have become older and the incidence of diabetic nephropathy has increased, no conclusions could be drawn on a concomitant increase in co-morbidity. This patient group may serve as a reference population to study future changes in patient case-mix within the Netherlands. Furthermore, the use of common international definitions of co-morbidity is needed to be able to make comparisons of survival data