Energy expenditure before and after surgery was determined in seven patients by the doubly labeled water (2H218O) method (DLW). The values were compared with values obtained by respiratory gas exchange by means of a metabolic measuring cart (MMC). Patients were maintained on total parenteral nutrition before and after trauma. The principal finding was an increase in the rate of CO2 rpoduction of 11.9 ± 5.0% after surgery. This corresponds to a 267 ± increase in energy expenditure (p < 0.05). No trauma-associated change in energy expenditure was found with the MMC. The correlation of preoperative values from MMC and DLW was not statistically significant (r = 0.25), nor was the correlation of MMC and the Harris-Benedict equation, but the correlation of DLW with Harris-Benedict equation was statistically significant (r = 0.73, p < 0.05). We suggest that the discrepancy is because the DLW method measures the cumulative energy expenditure over a period, whereas the MMC gives a 'spot' measurement.
|Original language||English (US)|
|Number of pages||8|
|State||Published - Jan 1 1988|
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