经的MB leads little changes of hemodynamics due to inhibit cardiac sympathicotonia and pneumogastric nerve simultaneity, but TEB brings the evident changes due to only inhibit pneumogastric nerve.
纵隔阻滞与
膜外阻滞
，膜外阻滞抑制交感
经，引起明显血流动
化，而纵隔阻滞同时抑制心交感和心迷走经，不引起明显血流动化。
