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. Monitoring oxygen saturation is important but secondary to addressing the immediate cause of the cardiac tamponade.B. Observing for jugular vein distention is relevant but not the priority compared to directly addressing the tamponade.C. Notifying the healthcare provider to prepare for pericardiocentesis is the most critical intervention. Cardiac tamponade requires immediate decompression to relieve pressure on the heart and restore normal function.D. Assessing for paradoxical blood pressure can provide additional information but does not address the immediate need for intervention.