引言 在军事航空中遇到高而迅速变化的+Gz作用能导致压力感受器所受压力的巨大改变,这种变化可能影响系统的血管阻力的调节和极限的G耐力。我们研究了颈动脉窦压力的改变对压力感受器血管传递响应程度和时间的影响。方法 用氯醛酮将狗麻醉,人工通气并打开胸腔,用灌注回路从而允许对胸主动脉和与脉管独立的颈动脉窦单独进行压力控制。以 INTRODUCTION The high and rapidly changing + Gz effect encountered in military aviation can lead to a drastic change in the pressure on the baroreceptors that may affect the regulation of systemic vascular resistance and the ultimate G endurance. We investigated the effect of changes in carotid sinus pressure on the degree and duration of baroreceptor vascular responses. Methods Dogs were anesthetized with chloralkrone, artificially ventilated and the chest opened, with a perfusion circuit allowing separate pressure control of the thoracic aorta and of the vessel-independent carotid sinus. To