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
外阻滞相比，外阻滞抑制交感神经，引起明
动力
变化，而纵隔阻滞同时抑制心交感和心迷走神经，不引起明动力变化。
