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.
滞与硬膜外
滞相比,硬膜外
滞抑制交感神经,引起明显血流动
化,而
滞同时抑制心交感和心迷走神经,不引起明显血流动
化。