The present invention provides compounds of formula (I): wherein A, R1, R2, R3I, V, X, and Z are defined herein, which are potassium channel inhibitors. The invention further provides pharmaceutical compositions comprising the compounds of formula (I) and their use in therapy, in particular in treatment of diseases or conditions that are mediated by Kir3.1 and/or Kir3.4 or any heteromultimers thereof, or that require inhibition of Kir3.1 and/or Kir3.4 or any heteromultimers thereof.本發明提供式(I)化合物,其中A、R1、R2、R3I、V、X及Z係定義於本文中,該等化合物係鉀通道抑制劑。本發明另外提供包含該等式(I)化合物之醫藥組合物,及其在療法中之用途,特別用於治療由Kir3.1及/或Kir3.4或其任何異多聚體介導或需要抑制Kir3.1及/或Kir3.4或其任何異多聚體之疾病或病況。