We selected 231 petients with WPW syndrome that was concomitant withhistory of tachycardia and 200 patients with history of AVNRT.The inci-dence of atrial fibrillation in WPW group was 46.3 % That in AVNRTgroup was 2.5%.Comparison of two groups showed significantly different.Af(+)patients in WPW group were significantly shorter than Af(-)in sameGroup and atrial refractory stage in AVNRT group.Relative smaller wave-length of atrial impulse(FRPA/PA)also showed significantly decreased.The maximal value DI/D2 of prolonsed degrce of persistant time by righttrial wave in high siie was obtained by early stimulating in right atrial highsite.D2/D1 was sited above 1.5 in non-contimal strial active area that con-duced delay ares below 20 ms of persistant time prolonged of atrial waveand area of fast atrial fibrillation.The incidence of these indexes in Af(+)group and RAF(+)was significantlyInased.The results suggested that atrial fibrillation in WPW syndromehas an important relation with pathway existed end atrial characters.
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