During proecedure main cardiac arrhythmia found its expression in node tachycardia beat(81.8% ), ventricular premature contraction (45.5% ) and after procedure in sinus rate variation.
Results showed that long _ cycle leading to atrial fibrillation and flutter were mostly compensating period due to atrial prematurebeat or obviously sinus bradycardia.
Conclusion: atrial overdrive can prevent AF, which may results from accelerating interatrial conduction, inhibiting atrial prematurebeat, eliminating sinus bradycardia and long short interval.