After several days of sedation and mechanical ventilation, a client is successfully extubated and is placed on oxygen 40% by face mask. While making rounds, the nurse finds that the client is confused and is attempting to get out of bed. Vital signs are temperature 99.2° F (37.3° C), heart rate 112 beats/minute, respirations 16 breaths/minute, blood pressure 100/70, and oxygen saturation 98%. Which action should the nurse take?

Rationale:
A. Place the client's feet on pillows while sleeping: Elevating the feet can reduce peripheral edema but does not alleviate nocturnal dyspnea or orthopnea associated with left ventricular failure. This intervention addresses circulation but not respiratory comfort.

B. Elevate head of bed to a semi-Fowler's position while asleep: Elevating the head reduces venous return to the heart, decreases pulmonary congestion, and relieves orthopnea. This position helps minimize nighttime coughing and shortness of breath, directly addressing symptoms of left ventricular failure.

C. Leave a glass of water at the bedside for use during the night: While hydration is important, water does not alleviate cardiac-related nocturnal symptoms and does not prevent fluid accumulation in the lungs causing cough or dyspnea.

D. Give a PRN dose of cough syrup or expectorant: Cough medications may temporarily relieve irritation but do not treat the underlying pulmonary congestion from left ventricular failure. Symptom management should focus on optimizing cardiac function and positioning rather than suppressing the cough.

Rationale:
A. Unstable hemodynamics: Performing a thoracentesis in a client with unstable blood pressure or cardiac output increases the risk of circulatory collapse. Fluid removal can further compromise venous return and perfusion, making hemodynamic stability a critical prerequisite for the procedure.

B. Coagulation deficiencies: Clients with coagulopathies, such as low platelet counts or elevated INR, face a high risk of bleeding into the pleural space or chest wall during thoracentesis. Correction of clotting abnormalities is necessary before proceeding to prevent hemothorax or uncontrolled bleeding.

C. Hypertension: Elevated blood pressure alone is not a contraindication for thoracentesis. It may require monitoring and control, but it does not inherently increase procedural risk unless accompanied by other cardiovascular instability.

D. Mechanical ventilation required: Clients on mechanical ventilation can safely undergo thoracentesis when carefully monitored, although it requires expert technique to prevent pneumothorax. The need for mechanical ventilation is not an absolute contraindication.

E. Tracheal deviation: Tracheal deviation is often a sign of mediastinal shift or large pleural effusion, not a reason to avoid thoracentesis. In fact, the procedure may help relieve pressure by removing excess pleural fluid.

F. Infection is incorrect because systemic infection alone is not a strict contraindication; however, infection at the puncture site would be a concern, but this option is too general.