Question

Following insertion of a pulmonary artery catheter (PAC), the physician orders the nurse to obtain a blood sample for mixed venous oxygen saturation (SvO2). Which action by the nurse best ensures the obtained value is accurate?

Answer 1

To obtain an accurate SvO2 measurement, the nurse should ensure the PAC is properly inserted, fill the balloon completely, position the patient supine, maintain the waveform on the monitor, draw a blood sample from the proximal port, and transport it to the lab for analysis.

Step-by-step explanation:

To ensure an accurate mixed venous oxygen saturation (SvO2) measurement, the nurse should follow these steps:

1. Ensure the pulmonary artery catheter (PAC) is properly inserted and functioning.
2. Fill the balloon at the end of the PAC completely with air.
3. Position the patient in a supine position.
4. Maintain the waveform on the monitor.
5. Draw a blood sample from the proximal port of the PAC using a heparinized syringe.
6. Immediately transport the blood sample to the lab for analysis.

By following these steps, the nurse can obtain an accurate measurement of SvO2, which reflects the oxygen saturation of mixed venous blood returning to the heart.