3.2 Study characteristics
Baseline characteristics among these studies are shown in Table 1 and 2. There were 2397 underwent HPSD RFA and 2537 underwent conventional ablation procedures. In the HPSD group and conventional group, mean age was 63.53 and 61.88 years, with 67.58% and 70.40% male, respectively. The baseline characteristics were not significant difference between the two groups and the follow-up duration was at least 6 months. Study quality assessed by Newcastle Ottawa scale demonstrated that ten studies scored 9 and seven studies scored 8, which indicated good quality of the included studies (Table 3).