Objective;To compare and assess the curative effects

starting time and side effects of cardioversion drugs used for treatment of paroxysmal supra - ventricular tachycardia ( PSVT)

including adenosine triphosphate ( ATP)

dofetilide

and cedilanid. Methods; The data of 40 admitted children with PSVT treated with ATP

dofetilide and cedilanid in recent 5 years were collected. The cardioversion time

success rate and side effects of the drugs were compared. The constituent ratio was determined with check x2. Significant level a was 0.05. Results: In group ATP

89.47% of patients were interrupted; 63. 15% of them had side effects; the cardioversion time of ATP was 3-30 seconds. In group dofetilide

72.73% the patients were interrupted; 9.09% of them had side effects; the cardioversion time of dofetilide was 5- 30min. In group cedilanid

61. 11% the patients were interrupted; 5. 55% of them had side effects; the cardioversion time of dofetilide was 20min -5h. Conclusion; ATP should be considered the drug of first choice for PSVT in children without organic heart diseases and serious complication and it has only minor and transient side effects. Dofetilide is equally effective in interrupting PSVT

and has minor side effects

which should be considered the first choice and best suitable for atrioventric-ular reentrant tachycardia. Cedilanid should be considered the drug of first choice for PSVT in children with serious heart failure

and it has a synergic effect to ATP and dofetilide.