At what point (at steady state) during the procedure does the therapist terminate indirect calorimetry?
A. when the Vo2 and Vco2 vary by less than 5% and the RQ by less than 10% over 5 consecutive minutes
B. when the Vo2 and Vco2 vary by less than 10 % and the RQ by less than 5% over 5 consecutive minutes
C. when the ratio of the Vo2 and Vco2 equals 0.8 and when the RQ equals 0.8 for at least 3 consecutive minutes
D. when the ratio of the Vo2 and Vco2, and the RQ vary by less than 10% for 3 consecutive minutes
?ANS: B
A. Incorrect response: See explanation B.
B. Correct response: Once indirect calorimetry is initiated, the end point of testing is achievement of a steady state defined by variation of the Vo2 and Vco2 by less than 10%, and respiratory quotient (RQ) by less than 5% over a consecutive 5-minute interval. Extrapolating test results from this steady-state period over 24 hours provides an adequate measure of caloric expenditure.
C. Incorrect response: See explanation B.
D. Incorrect response: See explanation B.
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