STUDY THE VALUE OF EXERCISE STRESS TEST TO ASSESS THE RISK OF PREEXCITATION SYNDROME
Background: Preexcitation syndrome is common to be seen in clinical arrhythmia, some of which may have palpitations and paroxysmal supraventricular tachycardia, while most of which have no symptoms.The main risk of preexcitation syndrome is fast ventricular response and even sudden death induced by artial fibrillation(AF). SO it is necessary for patients of preexcitation syndrome to conduct risk assessment, on whose results whether do the rodiofrequence cathater abtation(RFCA) are depended. It is reported that the loss of preexcitation in a single heartbeat during exercise stress testing(EST)is a predictor of low risk of sudden death in preexcitation syndrome patients.
Objectives: Observe whether the preexcitation disappear during the EST in preexcitation syndrome patients, by which assess the risk of sudden death. Furthermore study the value of EST in preexcitation syndrome patients.
Methods: In this research, choose patients with manifest preexcitation syndrome as objects. Give them treadmill exercise test and transesophageal electrophysiological examination. Observe if the preexcitation disappear among the process of the exercise test in drfferent objects, by which the objects are divided into two groups. Besides, measure the duratiion of the refractory period of the pathway among the process of the transesophageal electrophysiological examination. Compare the duratiion of the of the pathway and general condition (including RR interval, PR interval, Q wave, ST-T and blood pressure) in the two groups.
Results: Of the 78 patients who underwent EST, 6(7.69%), lost preexcitation in a single heartbeat during EST. These patients’ refractory period of bypass are ralatively long.
Conclusions: EST was proved to be a cost-saving strategy in risk assessment of preexcitation patients.