摘要(Abstract)：

<正> When the pre-exitation is complicated with strial fibrilation,there is a potential ofventrial fibrilation because of the high ventricular rate.this can severely changethe dyamics of blood and induce sudden death.So it is important to be treatedtimely and correctly.In our study,among 252 patients with PSVT treated byRFCA in our hospital in recent years,there were 8 cases had atrial fibrilation,6 ofwhich had left excessory pathway(including 2 having conceal excessorypathway),the other 2 cases had right excassory pathway.4 cases with dominontexcessory pathway,of the eight patients were given no antiarrhythmic drugsbefore the operation and atrial fibrilation occured in 2 patients during theelectrode location surveying.The other two patients with dominant excessorypathway were given amiodarone before the operation,and no atrial fibrilationoccured during the dilation.No management was given to the 2 patients withconceal excessory pathway before the operations and atrial fibrilation occuredduring the operstion and the arrhythmia disappeared after using diazeparn andcadilanid.It is said that most of the excessory pathway are in left side in patientsof pre-exitation complicated with atrial fibrilation.It maybe due to the highpressure of atrium when ventricular pacing or hypoxia caused by reentranttechycardia or the unstability of electrophysilogy when in high heart rate.Toavoid complications,some procedures should be performed in the patients of pre-exitation with atrial fibrilation treated by RFCA.The procedure are as following:1)If the Patients had a definite history of AF,amiodarone should be used beingtaken for 7 days or 2-3 weeks to prevent the occurance of AF during theoperation.This can reduce the incidence rate of effectively,so as to increase thesuccess rate and reduce the malignant arrhythmias.Propafenone is effective forthe AF occured during the operation.The application of digltalis should beavoided.If the AF still occure after the application of drugs during the operations,defibrilation is to be used if necessary.2)reduced the excessive stimulation to themyocardium during the operation and shorten the stimulating time when the heartis pacing.

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