A client has just returned to the nursing unit following cardiac catheterization. In the immediate postprocedure period, which of the following is the priority nursing action?

A. Monitoring the insertion site for infection: Infection is a potential complication, but it is not an immediate concern right after the procedure. Signs of infection develop hours to days later, so this assessment is important but not the priority in the immediate postprocedure period. B. Checking for orthostatic hypotension: Orthostatic changes are not typically the most urgent issue immediately after cardiac catheterization. The client is usually kept in a supine position, which limits the risk of sudden blood pressure drops. While monitoring vital signs is important overall, vascular site integrity takes precedence at this stage. C. Forcing fluids: Increasing fluid intake is encouraged postprocedure to promote excretion of contrast dye and protect kidney function. However, this intervention does not address the primary acute risk, which is bleeding from the catheter insertion site. Fluids are helpful but not the most immediate priority. D. Immobilizing the affected extremity: The insertion site, often in the femoral artery, is at high risk for bleeding or hematoma formation immediately after the procedure. Immobilizing the extremity helps maintain pressure at the site and prevents disruption of the arterial puncture. This action directly reduces the risk of hemorrhage, making it the top priority.