At what point (at steady state) during the procedure does the ...

[hubes95]

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

Question 2

What is the most immediate potential problem associated with overfeeding in a patient with chronic CO2-retention?
 
  A. The patient's O2 consumption will increase.
  B. The patient's CO2 production will increase.
  C. The patient's energy expenditure will decrease.
  D. Hyperventilation will follow.

[peter]

Answer to Question 1

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.

Answer to Question 2

ANS: B
A. Incorrect response: See explanation B.
B. Correct response: Overfeeding, which induced lipogenesis, promotes excessive CO2 production. An increased CO2 production may overwhelm respiratory function in persons with reduced ventilatory capacity.
C. Incorrect response: See explanation B.
D. Incorrect response: see explanation B.