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Background:A high ablation success rate for ventricular arrhythmia (VA) from outflow tract has been achieved,but some of them cannot be eliminated from endocardium.We investigated the association between adenosine sensitivity and ablation success/recurrence rates with a nonirrigated or an irrigated catheter.Methods:According to adenosine test,all patients were divided into a sensitive group (S group) or an insensitive group (Ⅰ group).The patients of each group were randomized into a nonirrigated catheter (NA) subgroup or an irrigated catheter (IA) subgroup with a 2∶1 ratio.Results:In S group of 122 patients (84 in NA subgroup),the ablation success rate was similar between two subgroups (94.7％ vs.90.5％,P ＞ 0.05),but in Ⅰ group of 94 patients (60 in NA subgroup),it was higher in IA subgroup (94.1％) than that in NA subgroup (73.3％,P ＜ 0.05).The success rate using nonirrigated catheter was significantly higher in S group (90.5％) than that in Ⅰ group (73.3％,P ＜ 0.01),and the recurrence rate was lower in S group than that in Ⅰ group (1.3％,vs.13.6％,P ＜ 0.05).On the contrary,the success rate and the recurrence rate using irrigated catheter were similar between S group and 1 group (94.7％,94.1％,P ＞ 0.05,vs.2.8％,6.3％,P ＞ 0.05).Conclusions:Adenosine insensitivity is associated with a lower success rate and a higher recurrence rate for VA patients undergoing nonirrigated catheter ablation.Thus,irrigated catheters should be the first choice for VA ablation in adenosine insensitive patients.