A compound of formula I wherein A, R1, R3, and R24 are described herein. The compounds are useful as inhibitors of potassium channel function and in the treatment and prevention of arrhythmia, IKur- associated disorders, and other disorders mediated by ion channel function.本發明係關於式I化合物:其中A、R1、R3及R24係如本文所述。該等化合物可用作鉀通道功能之抑制劑,及用於治療及預防心律失常、IKur-相關病症及離子通道功能介導的其他病症。