You are being oriented to a new unit and are working with one of the nurses. You notice the nurse places his patient supine and raises the patient's legs up to 45 degrees and holds them there. You know that the nurse is doing which of the following?

Choice A rationale Preventing blood clots in the legs, known as deep vein thrombosis prophylaxis, usually involves the use of sequential compression devices, anticoagulants like heparin, or early ambulation. Simply holding the legs at a 45-degree angle for a short period does not provide the sustained movement or chemical intervention needed to prevent clot formation. While elevation can help with venous return, it is not a recognized standalone procedure for the prevention of systemic venous thromboembolism in clinical practice. Choice B rationale Checking for skin breakdown requires a thorough visual inspection of bony prominences such as the sacrum, heels, and hips. While lifting the legs allows the nurse to see the heels, the specific action of holding them at 45 degrees while the patient is supine is a specialized hemodynamic assessment. Skin assessments involve repositioning the patient and looking for redness or stageable ulcers rather than performing a specific maneuver designed to shift blood volume back toward the heart for diagnostic purposes. Choice C rationale This maneuver is known as a Passive Leg Raise. It serves as a functional hemodynamics challenge by shifting approximately 300 mL of venous blood from the lower extremities into the central circulation. This acts as an endogenous fluid bolus. If the patient’s cardiac output or stroke volume increases after this maneuver, they are considered fluid responsive, meaning they will likely benefit from intravenous fluid administration. This is a reliable, reversible way to assess the need for fluids without the risk of fluid overload. Choice D rationale Active range of motion exercises require the patient to move their own limbs through their full range of motion to maintain joint flexibility and muscle strength. If the nurse is holding the legs up, the exercise is at best passive, not active. Furthermore, holding the legs static at 45 degrees does not move the joints through any range of motion. Therefore, this action does not meet the criteria for therapeutic exercise and is clearly intended for a different diagnostic clinical purpose.