麻醉家兔无论在迷走神经完整或切断后,急性缩窄胸主动脉使血压升高时,约半数能诱发少量室性早搏等。但在迷走神经切断后它们潜伏期较短,且可被心得安所阻断。当缩窄胸主动脉或静滴苯肾上腺素使血压预先升高(未出现心律失常)时,可使刺激下丘脑室旁核诱发的室性早搏次数明显增加。这在迷走神经切断后更为明显,而且血压预先升得越高,刺激 Anesthetic rabbits either in the vagus nerve integrity or cut off, acute narrowing of the thoracic aortic blood pressure, about half can induce a small amount of premature ventricular contractions and so on. However, they have a shorter incubation period after the vagus nerve has been cut off and can be blocked by propofol. When narrowing the thoracic aorta or intravenous injection of phenylephrine to increase blood pressure (arrhythmia), the frequency of ventricular premature ventricular contractions induced in the paraventricular nucleus of the hypothalamus can be significantly increased. This is more obvious after the vagus nerve is cut off, and the higher the blood pressure rises in advance, stimulates