A catheter assembly, comprising: a catheter body (130) including a proximal portion, an intermediate portion (140) extending from the proximal portion and a distal portion (142) extending from the intermediate portion the distal portion comprising an ablation section (144) and a mapping section (138, 148) distal to the ablation section, the ablation section including an ablative element (134) and an ablative energy source coupled to the ablation section to activate the ablative element wherein upon activation by the energy source, the ablative element creates a lesion, the mapping section including reference electrodes (148) not coupled to the ablative energy source wherein electrical activity sensed by the electrodes provides information for determining whether ablation is required, the distal portion comprising a loop, the ablation element (134) positioned along the loop.
