While performing indirect calorimetry on a mechanically ventilated patient who is unable to achieve steady state. What should the therapist do to obtain a resting energy expenditure measurement?
A. Obtain data for at least 15 minutes, and extrapolate the value to 24 hours.
B. Obtain data for three 15-minute intervals, determine the average, and extrapolate the value to 24 hours.
C. Obtain a mean value over the time of the testing period, and extrapolate the value to 24 hours.
D. No useful value for the resting energy expenditure can be obtained.
?ANS: C
A. Incorrect response: See explanation C.
B. Incorrect response: See explanation C.
C. Correct response: When a critically ill patient undergoes an indirect calorimetry test, achieving a steady state may be difficult for the patient. The achievement of a steady state ensures a greater degree of validity in terms of the resting energy expenditure (REE) measurement. For patients who fail to achieve steady-state conditions, obtaining a mean value for the REE over the time of the study is acceptable. This value is extrapolated over 24 hours.
D. Incorrect response: See explanation C.
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