Gaceta médica de México
Print version ISSN 0016-3813
CASTANON-GONZALEZ, Jorge A. et al. Effects of Different Positive End Expiratory Pressure Levels on Resting Energy Expenditure Measured by Indirect Calorimeter in Patients with Pressure-Controlled Ventilation. Gac. Méd. Méx [online]. 2004, vol.140, n.6, pp. 583-588. ISSN 0016-3813.
Objective: To identify variations during measurements of resting energy expenditure (REE), oxygen consumption (VO2 and CO production (VCO2 by indirect calorimetry (IC) in patients with pressure-controlled ventilation and different levels of positive end expiratory pressure (PEEP). Design: Prospective and comparative study. Setting: Intensive care unit (ICU) of a university-affiliated hospital. Measurements and Main Results: REE, VO2, and VCO2 were measured by IC in nine patients with pressure- controlled ventilation and different levels of PEEP. Paired t Wilcoxon and coeficient of variation tests for all measurements were carried out. Decrease in REE, VCO2, and VO2 was observed with increments in PEEP, these changes related with a concomitant reduction in VE. Coefficient of variation during IC was above 6%, and was lower in three patients who maintained the same VE throughout the study. Conclusions: Measurement of REE by Ids reliable atvarious levels of PEEP, and it improves if VE remains constant throughout measurement. Respiratory quotient (RQ) in this setting is not accurate.
Keywords : Resting energy expenditure; Indirect calorimetry; Positive end expiratory pressure.