血管迷走性晕厥ppt课件

型:?-心脏抑制型?- 混合型Р类型:?-血管抑制型Р类型:?-心脏抑制型?- 混合型Р80%Р20%Р25%Р75%Р起搏治疗Р60%Р40%Р二、血管迷走性晕厥? Vaso-vagal SyncopeР河南省胸科医院РCerebral?CortexРVascular?BedРBradycardia/?Hypotension?oppositionРBaro-?receptorsРHeartРFeedback via?Carotid Baroreceptors?Other MechanoreceptorsР¯ Heart Rate?¯AV?ConductionРopposition ? VasodilatationРBenditt DG, Lurie KG, Adler SW, et al. Pathophysiology of vasovagal syncope. In: Neurally mediated syncope: Pathophysiology, investigations and treatment. Blanc JJ, Benditt D, Sutton R. Bakken Research Center Series, v. 10. Armonk, NY: Futura, 1996Рsympathetic (+) Parasympathetic (+)РSympathetic(+)?Parasympathetic (+)РoppositionР河南省胸科医院Р正常心血管神经反射? 平卧改为直立? 腹部和下肢积血300-800ml? 回心血量减少? 中心静脉压、每搏输出量及动脉血压下降? 激活压力感受器(颈动脉窦和主动脉弓及心、肺) ? 冲动传入至脑干? 交感神经张力升高? 心率增快10-15次∕分? 舒张压升高5-10mmHg? 收缩压无改变或轻度下降