mb.

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.

纵隔阻滞硬膜外阻滞相比，硬膜外阻滞抑制交神经，引起明显血流动力学变化，而纵隔阻滞同时抑制交迷走神经，不引起明显血流动力学变化。