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.

纵隔与硬膜相比，硬膜制交感神经，引起流动力学变化，而纵隔同时制心交感和心迷走神经，不引起流动力学变化。