本文应用临床电生理检查及药物激发试验,探讨了流行性出血热(EHF)并发心动过缓的机理,27例EHF中并发心动过缓18例,占66.7%.其中5例窦房结功能经电生理及药物试验揭示明显异常,符合窦房结功能不全诊断标准.余13例电生理参数较非心动过缓组及对照组明显增高,但尚在正常范围.提示EHF并发心动过缓病例中部分系窦房结功能不全所致,推测可能与窦房结区充血、水肿、炎症、出血有关;部分病例则可能是植物神经功能失调,迷走神经张力增高所致. In this paper, clinical electrophysiological examination and drug challenge test to explore the mechanism of epidemic hemorrhagic fever (EHF) complicated with bradycardia, 27 cases of EHF complicated by bradycardia in 18 cases, accounting for 66.7% of which 5 cases of sinus node function Electrophysiological and drug tests revealed significant abnormalities consistent with the diagnosis of sinus node dysfunction.The remaining 13 cases of electrophysiological parameters than non-bradycardia group and control group was significantly higher, but still in the normal range.It suggests EHF complicated with bradycardia cases Part of the Department of sinus node dysfunction caused, presumably with the sinus node congestion, edema, inflammation, bleeding; in some cases may be autonomic dysfunction, vagus nerve tension increased.