A client with heart failure (HF) develops cardiac tamponade. The client has muffled, distant heart sounds, and is anxious and restless. After initiating oxygen therapy and IV hydration, which intervention is most important for the nurse to implement?

A. Cardiac tamponade is a life-threatening condition that requires urgent intervention, typically pericardiocentesis to relieve pressure on the heart. Immediate notification to the healthcare provider for preparation of this procedure is the priority. B. Paradoxical blood pressure (a drop in systolic BP during inspiration) is a key sign of cardiac tamponade, but the most important action is to prepare for pericardiocentesis. C. Jugular vein distention can be a sign of tamponade, but pericardiocentesis is the priority to address the underlying cause of the symptoms. D. While monitoring oxygen saturation is important, it is not the most critical action in this emergency situation.