Final answer:
Given the patient's chronic junctional escape rhythm with no atrial activity but normal AV node function, ventricular pacing is the most appropriate pacing modality due to the direct support it provides to the ventricles.
Step-by-step explanation:
The question relates to the situation where a patient exhibits a chronic junctional escape rhythm and has no atrial activity, but normal AV node function. Since there is no atrial activity, atrial pacing would not be beneficial. However, since the AV node is functioning normally, the need for pacing is focused on supporting the ventricles. Therefore, ventricular pacing is the appropriate choice, as it supports the ventricle directly. Dual-chamber pacing could also be considered as it could mimic the natural pacing of the heart if atrial activity becomes present at a later time. Transcutaneous pacing is typically used in emergency situations and would not be a long-term solution for chronic issues.