Which of the following is a critical aspect to monitor in a patient immediately following a heart catheterization?

Rationale: A. While infection monitoring is important, the risk immediately post-procedure is low; infection typically develops later, not immediately. B. Immediately following a heart catheterization, there is a risk of arrhythmias, bleeding, or hemodynamic instability, making continuous monitoring of cardiac rhythm and vital signs critical to detect complications early. C. Routine glucose monitoring is not specifically indicated unless the patient has diabetes; it is not a priority related to the catheterization procedure. D. While ongoing hydration and diet are part of overall care, they are not immediate priorities in the immediate post-catheterization period.