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经食道心房调搏可无创伤地测量预激旁道不应期。23例预激旁道不应期平均为283±49毫秒,<280毫秒者9例,房颤诱发率高(66.6%),心室率快,形似室速。≥280毫秒者(14例),房颤诱发率低(14.3%)心室率慢,QRS波正常者居多。普鲁卡因酰胺明显地延长旁道不应期,有利于预激合并房颤的治疗。
Transesophageal atrial pacing may be noninvasive measurement of refractory bypass refractory period. In 23 cases, the mean pre-shunt refractory period was 283 ± 49 ms, <280 ms in 9 cases, high incidence of atrial fibrillation (66.6%), fast ventricular rate and ventricular tachycardia. ≥280 msec (14 cases), a low rate of induced atrial fibrillation (14.3%) ventricular rate is slow, mostly normal QRS wave. Procaine amide significantly prolong the bypass refractory period, is conducive to the pre-excitation combined with the treatment of atrial fibrillation.