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Effect of correction of acidosis on nutritional status in dialysis patients.

Malnutrition is a well-recognised feature of end-stage renal failure and contributes to the continuing high morbidity and mortality in this group of patients. One of the aetiological factors is metabolic acidosis which has been shown to increase protein degradation in both experimental models of chronic renal failure and in humans with uraemia. Many patients currently receiving haemodialysis have subnormal values of plasma bicarbonate. However, the values can be normalised by using a dialysate bicarbonate concentration of 35-40 mmol/l and in continuous ambulatory peritoneal dialysis (CAPD), a similar increment in plasma bicarbonate can be achieved using a dialysate lactate content of 35-40 mmol/l. In short-term studies in haemodialysis patients there is evidence of an increase in body weight and other anthroprometric parameters when the plasma bicarbonate has been normalised by increasing the dialysate bicarbonate content. A long-term study in CAPD patients has demonstrated increased body weight, tricep skinfold thickness and midarm muscle circumference in those patients with a plasma bicarbonate of 27.2 +/- 0.3 mmol/l, compared to those with a value of 23.0 +/- 0.3 mmol/l. These studies strongly suggest that correction of acidosis by increased dialysate buffering capacity will improve nutritional status for patients with end-stage renal failure.