【摘要】 目的：探讨高原人室性早搏对心脏排血和充盈的血液动力学变化的影响。方法：对３５例室性早搏患者用脉冲多普勒心动图分别记录二尖瓣口及主动脉瓣口的血流频谱，同时用Ⅱ导联心电图在超声视屏上同步显示，分别测量室性早搏前正常心动周期二尖瓣口和主动脉瓣口的流速积分（ＮＭＶＩ和ＮＡＶＩ），室性早搏时二尖瓣口和主动脉瓣口的流速积分（ＥＭＶＩ和ＥＡＶＩ），及代偿心搏（室性早搏后）二尖瓣口和主动脉瓣口的流速积分（ＰＭＶＩ和ＰＡＶＩ），室性早搏提前指数为Ｔ－Ｒ＇／Ｒ－Ｒ。结果：ＥＭＶＩ和ＥＡＶＩ明显低于ＮＭＶＩ和ＮＡＶＩ，ＰＭＶＩ和ＰＡＶＩ显著高于ＮＭＶＩ和ＮＡＶＩ，但仅代偿４７％和４４％。室性早搏提前指数Ｔ－Ｒ＇／Ｒ－Ｒ与室性早搏排血比值（ＥＡＶＩ／ＮＡＶＩ）及室性早搏充盈比值（ＥＭＶＩ／ＮＭＶＩ）呈良好相关。结论：室性早搏时心搏量和充盈量明显下降，室性早搏后的心搏量和充盈量增高，但代偿不足，高原人室早时心搏量和充盈的减少较平原人室早时为少，而室早后的代偿能力却较强。过早的、过频的室早临床应予以重视。更多还原

【Abstract】 Objective and Methods:To study the hemodynamics of ventricular extrasystole (VS)on 35 high altitude residents with pulsed Doppler through transmitral and transaortic blood flow at apical 4 and 5 chamber views was waged.NMVI and NAVI were measured before,during and after VS respectively.The prematurity index is TR/RR. Results: EMVI and EAVI were lower than NMVI and NAVI,PMVI and PAVI were higher than NMVI and NAVI,only compensated 47% and 44% respectively.The prematurity index TR/RR well correlated with EAVI/NAVI and EMVI/NMVI. Conclusion: AVI and MVI decreased significantly,while PAVI and PMVI increased,but the compensation is incomplete.The reduction of AVI and MVI of high altitude residents is lower than sea level people do.更多还原