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.

纵隔硬膜外相比，硬膜外制交感神经，引起明显血流动化，而纵隔同时制心交感和心迷走神经，不引起明显血流动化。