The nurse is monitoring a patient's metabolic status with a thermodilution catheter to determine oxygen saturation of venous blood. The physiological study the nurse is conducting would be
1. indirect calorimetry.
2. direct calorimetry.
3. oxygen extraction.
4. Fick equation.
3
Rationale: Oxygen extraction is measured with the use of a special thermodilution catheter at the bedside. An indirect calorimetry is done with the use of a portable unit called a metabolic cart. A direct calorimetry is done with the use of a special room. The Fick equation requires blood gas analysis of arterial and venous blood.
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