The hypothalamic stimulation-induced ventricular extrasystole (HVE) is mainly due to an increased activity of the cardiac sympathetic nerves caused by excitement of this area.

• 根据上述结果，可以认为兔下丘脑也存在着“防御反应区”，HVE主要是兴奋了防御反应区造成心交感活动亢进所致。