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.
纵隔阻滞与外阻滞相,外阻滞抑制交感,引起明显血流动力变化,而纵隔阻滞同时抑制心交感和心迷,不引起明显血流动力变化。