家兔麻醉、制动、人工通气、剪断双侧窦神经和主动脉神经，心率（ＨＲ）和平均动脉血压（ＭＡＰ）与剪断神经前比较无显著性差异。急性低氧（吸入含氧量１１％低氧混合气，模拟海拔６５００ｍ）５分、１０分、１５分时ＨＲ和ＭＡＰ均明显低于低氧前水平（Ｐ＜０．０１），终止低氧后ＨＲ在１５分时恢复到低氧前水平，而ＭＡＰ则在低氧后５分恢复到低氧前水平。结果提示急性低氧可引起ＨＲ减在，ＭＡＰ降低。切断窦神经，主动脉神经不能使这一效应翻转。文中对有关机制进行了讨论。 Rabbits anesthesia, brachial, artificial ventilation, bilateral amputation of sinus and aortic nerves, heart rate (HR) and mean arterial pressure (MAP) compared with before cutting the nerve no significant difference. The HR and MAP in acute hypoxia (inhaled 11% hypoxia with simulated altitude of 6500m) were significantly lower than those before hypoxia (P <0.01) HR returned to hypoxic pre-hypoxic levels at 15 minutes and MAP returned to pre-hypoxic levels 5 minutes after hypoxia. The results suggest that acute hypoxia can cause HR reduction, MAP decreased. Cut off the sinus nerve, aortic nerve can not make this effect flip. The paper discussed the mechanism.