Final answer:
The nurse should take hemodynamic measurements when the patient is stable and follow strict aseptic techniques, ensuring transducers are calibrated for accurate readings in an ICU or surgery setting.
Step-by-step explanation:
When a nurse is caring for a mechanically ventilated patient with a pulmonary artery catheter and continuous enteral tube feedings, the best nursing action for obtaining continuous hemodynamic monitoring measurements is to ensure that the measurements are taken at appropriate times when the patient is hemodynamically stable, and to evaluate the readings in the context of the patient's overall clinical picture. When handling catheters for pressure measurements, it's important for the nurse to follow strict aseptic techniques to prevent infections and to ensure the transducers are calibrated correctly for accurate readings. As these procedures are quite invasive, they are generally performed in a surgery or intensive care setting by highly trained health professionals.