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.

• 纵隔阻滞与硬膜外阻滞相比，硬膜外阻滞抑制交感神经，引起明显血流动力学变化，而纵隔阻滞同时抑制心交感和心迷走神经，不引起明显血流动力学变化。