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本文通过头颅CT 及穿颅多普勒超声仪研究了106例颈内动脉闭塞病人的脑梗塞类型与脑血管对CO_2反应性的关系。根据不同原因所致的脑梗塞在CT 片中的典型形态及部位,将脑梗塞分为栓塞性、血液动力学型及小血管病变所致的腔隙性梗塞。脑血管对CO_2的反应性用穿颅多普勒超声仪测定,高CO_2状态通过吸入5%CO_2及95%O_2的混合气体,低CO_2是通过过度换气的方法。正常情况下,不同CO_2分压时脑血流的速度不同,呼气末CO_2每增加1vol%,大脑中动脉血流速度增加至少10%;相反,CO_2每下降1vol%,则血流速度至少下降10%。在脑
In this paper, cranial CT and transcranial Doppler ultrasound in 106 cases of internal carotid artery occlusion patients with cerebral infarction and cerebrovascular CO_2 reactivity. According to the typical causes and locations of cerebral infarction caused by different causes in CT slices, cerebral infarction is divided into lacunar infarction caused by embolism, hemodynamics and small vessel disease. Reactivity of cerebrovascular to CO 2 was determined by transcranial Doppler ultrasound. High CO 2 was inhaled through a mixture of 5% CO 2 and 95% O 2, and low CO 2 was hyperventilation. Under normal circumstances, the different partial pressure of CO 2 cerebral blood flow at different speeds, end-expiratory CO 2 for each additional 1vol%, the middle cerebral artery blood flow increased by at least 10%; the contrary, each CO_2 decreased 1vol%, then the blood flow rate decreased at least 10%. In the brain