NDT Advance Access published online on October 5, 2006
Nephrology Dialysis Transplantation, doi:10.1093/ndt/gfl558
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1 Nephrology Service, Fundación Hospital Alcorcón, Madrid, Spain
* To whom correspondence should be addressed. Background. Retrospective studies have shown hospitalization and mortality rates during haemodialysis (HD) to be associated with anaemia. Methods. The prospective, multicentre Morbidity-and-mortality Anaemia Renal (MAR) study was designed to establish the burden of anaemia by controlling for other risk factors. Charlson index was used for comorbid adjustment. Finally, 1428 patients from 119 centres (60% men, aged 64.4 years, time on HD 15.3 months, Charlson comorbidity index 6.5 ± 2.3) completed follow-up. They had hypertension (75.8%), diabetes mellitus (25.9%), heart failure (13.9%) and coronary disease (16.7%). Of the total patients, 94.8% were receiving erythropoietin (111.6 ± 70.6 U/kg/week) and 76.7% i.v. iron, and haemoglobin (Hb) at inclusion was 11.7 ± 1.5 g/dl. Results. Hospitalization rate was 1.1 admissions/patient/year. Yearly mortality was 12% [35% cardiovascular (CV)]. The relative risk and confidence interval (CI) for hospitalization and death were 0.86 (0.81-0.91) and 0.82 (0.73-0.91), respectively, per 1 g/dl increase in initial Hb after adjustment for comorbidity, vintage, aetiology, access type, albumin and Kt/V. The probability of remaining free from hospitalization (CI) was 0.34 (0.27-0.41) for initial Hb <10 g/dl, 0.47 (0.41-0.53) for Hb 10-11 g/dl, 0.54 (0.49-0.59) for Hb 11-12 g/dl, and 0.63 (0.59-0.67) for Hb >12 g/dl. Same analysis for patient survival was 0.77 (0.71-0.83) for Hb <10 g/dl vs 0.82 (0.77-0.87) for Hb 10-11 vs 0.89 (0.86-0.92) for Hb 11-12 vs 0.92 (0.90-0.94) for Hb > 12 g/dl, P < 0.001. The Cox regression model for hospitalization-free survival included the risk factors initial Hb (relative risk 0.86 per 1 g/dl increase, P < 0.001) Charlson, albumin and prior CV event. Conclusion. Hb level predicted 1-year-survival and hospitalization. This effect persisted after adjustment for comorbidity and other prognostic factors.
Received September 12, 2005
Accepted August 21, 2006
Original Papers
A prospective multicentre study of the role of anaemia as a risk factor in haemodialysis patients: the MAR Study
José Portolés 1 *, Juan Manuel López-Gómez 2, and Pedro Aljama 3, on behalf of the MAR Study Group
2 Nephrology Service, Hospital Universitario Gregorio Marañón, Madrid, Spain
3 Nephrology Service, Hospital Universitario Reina Sofía, Córdoba, Spain
José Portolés, E-mail: jmportoles{at}fhalcorcon.es
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