Which assessment finding post cardiac catheterization warrants immediate action?

The absence of a peripheral pulse following a cardiac catheterization is a significant concern that requires immediate action. This finding suggests potential complications such as arterial occlusion or thrombosis, which can lead to serious consequences if not addressed promptly. When a peripheral pulse is absent, it may indicate that blood flow to the extremity is compromised, which can result in ischemia. Immediate intervention is crucial to restore blood flow and prevent further tissue damage or loss.

In contrast, an increase in heart rate, while it may warrant monitoring, is not as urgent as the lack of a pulse. An increased level of consciousness is generally a positive sign, indicating that the patient is alert and responsive. A feeling of warmth in the extremities could indicate normal blood flow and is usually not associated with an emergency situation. Thus, among the choices provided, the absence of a peripheral pulse is the most critical assessment finding that requires rapid evaluation and intervention.