Effect of nutritional status on acute phase protein response to elective surgery.

The aim of this study was to assess the effect of nutritional status on the acute phase protein response to elective surgery. Matched pairs of patients with gastric or colorectal cancer were studied. Undernourished patients (body-weight less than 80 per cent of ideal and triceps skinfold thickness less than 65 per cent of standard) were matched with controls (body-weight greater than 95 per cent of ideal and triceps skinfold thickness greater than 80 per cent of standard) for age, sex, type of pathology and surgery. Blood samples taken preoperatively and on days 1-5 after operation were analysed for C-reactive protein, alpha 1-antitrypsin, alpha 1-acid glycoprotein, albumin, prealbumin and transferrin. There was no significant difference in any of the preoperative protein concentrations between the two groups although undernourished patients tended to have lower transferrin concentrations (mean +/- s.e.m., 2.2 +/- 0.3 g/l) than the control group (2.9 +/- 0.1 g/l). C-reactive protein response was significantly smaller in the undernourished group than in the control group (P = 0.05, Mann-Whitney U test). The responses of the other acute phase proteins did not differ between the two groups. There was no difference in the length of hospital stay after operation when undernourished patients (mean +/- s.e.m., 17.7 +/- 3.0 days) were compared with controls (14.3 +/- 3.6 days). Undernourished patients therefore have an attenuated C-reactive protein response to elective surgery. The significance of this in relation to morbidity and mortality in severely ill patients requires further investigation.