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. 1989 Jan;209(1):63–72. doi: 10.1097/00000658-198901000-00010

An integrated analysis of glucose, fat, and protein metabolism in severely traumatized patients. Studies in the basal state and the response to total parenteral nutrition.

J H Shaw 1, R R Wolfe 1
PMCID: PMC1493884  PMID: 2491939

Abstract

A series of isotopic infusions were performed in 43 severely ill patients suffering from blunt trauma (mean injury severity score of 31). The patient data have been compared with data obtained from 32 normal volunteers, and in addition the metabolic response of the trauma patient to total nutritional support (TPN) has been assessed. The rate of VO2 was elevated in the trauma patients compared with that of the volunteers (160 mumol/kg/minute vs. 103 mumol/kg/minute). Glucose production was significantly increased in the patients compared with the volunteers (21 +/- 2 mumol/kg/minute vs. 14 +/- 1 mumol/kg/minute), but the trauma patients had an impaired capacity to directly oxidize plasma glucose. The percentage of glucose uptake oxidized in the volunteers was 36 +/- 2%, and the percentage of glucose uptake recycled was 10 +/- 1%. By contrast, in the trauma patients, 23 +/- 4% of the glucose uptake was directly oxidized, and 29 +/- 11% was recycled. The rate of glycerol turnover in the trauma patients (5.3 +/- 0.3 mumol/kg/minute) was significantly elevated compared with the volunteer value (2.2 +/- 0.1 mumol/kg/minute), and the basal rate of fat oxidation was twice as high in the patients as in the volunteers (2 mg/kg/minute vs. 1 mg/kg/minute). The rate of whole body protein catabolism was significantly higher in the patients (5.8 +/- 0.7 g/kg/day vs. 4.3 +/- 0.3 g/kg/day), and as a result, the rate of net protein catabolism was significantly elevated in the patients. The response to TPN (amino acids and a 50:50 mixture of glucose and fat) included an increase in the percentage of glucose uptake oxidized (up to 45 +/- 12%), a decrease in the oxidation of fat (up to 0.8 mg/kg/minute), and a significant increase in whole body protein synthesis (up to 6.1 +/- 1.1 g/kg/day) so that the rate of net protein loss was minimized but not prevented. (The rate of net protein catabolism during TPN was 1.3 +/- 0.5 g/kg/day.) There was no correlation between the injury severity score (ISS) and the degree of metabolic abnormality. The rate of NPC in the patients with ISS less than 20 was higher than in the volunteers (ISS = 0), but the values for NPC in patients with ISS 21-40, and ISS greater than 40 were virtually identical to the corresponding values in patients with ISS less than 20. It is concluded from these studies that: 1) Trauma patients have a high rate of VO2.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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