Techniques are disclosed for contemporaneously assessing the success of arenaldenervation procedure. One or more characteristics of a patients heart, suchasatrioventricular (AV) interval, PR interval and/or heart rate are monitoredduring anablation procedure. A change in the heart characteristic detected during theablationmay indicate successful denervation. Accordingly, successive new locations maybetargeted for ablation until a change is detected.
