目的 研究体外电除颤的能量选择对于除颤成功率的影响?方法 回顾性分析了107例体外非同步电除颤临床病例?将除颤尝试以次序(首次?第二次?第三次)进行分组，分别研究各组除颤结果?分析不同能量下的除颤成功率以及除颤成功组与失败组的除颤能量分布，并研究病例基础疾病对除颤能量的影响?结果 随着除颤次序的增加，常规能量组(≤200J)的除颤成功率逐渐下降;相反，高除颤能量组(>200J)的除颤成功率逐渐升高，且两组间的除颤成功率差异不断扩大?另外，随着除颤次序的增加，成功组的平均除颤能量不断升高，与失败组平均能量的“,”Objective To investigate the effects of external defibrillation energy on the success rate. Methods A retrospective analysis of 107 clinical cases of external defibrillation was conducted. The defibrillation attempts were divided into groups by their sequence (first， second， third)， and the results of defibrillation attempts in each group were studied separately. The success rate under different defibrillation energies and energy distribution of the success and failure groups were analyzed， as well as the impact of underlying diseases on defibrillation energy. Results The increase in the defibrillation sequence， success rate of conventional energy group (≤200 J) decreased;in contrast， that of high energy (>200 J) increased;the difference in the success rate between two groups expanded. The average defibrillation energy of the success group increased， and the difference of average energy between success and failure group had expanded. Moreover， for cases with underlying heart diseases， a larger proportion of cases required high energy to achieve a successfully defibrillation (32.50% vs. 19.44%， P<0.05). Conclusions For cases with underlying heart diseases， when conventional energy defibrillations fail， a higher energy should be considered to increase the success rate of defibrillation.