Taylor D E, Tukmachi E S
Q J Exp Physiol. 1987 Apr;72(2):171-80. doi: 10.1113/expphysiol.1987.sp003061.
In experiments on six anaesthetized dogs it was found that the vertebral artery contributed 69.2 +/- 1.7% of cerebral and 41.5 +/- 2.5% of cephalic flow. The input characteristics were that the vertebral artery had a flow of 0.71 +/- 0.05 ml X s-1 into an input impedance of 23.7 +/- 1.9 GN X m-5 X s. This compared to external and internal carotid flows of 0.69 +/- 0.05 and 0.31 +/- 0.02 ml X s-1 into input impedances of 23.9 +/- 2.1 and 52.1 +/- 2.7 GN X m-5 X s respectively. Standardized per 100 g of tissue the impedances of the vertebral and internal carotid arteries were similar at 18.6 +/- 2.0 and 19.1 +/- 1.5 GN X m-5 X s X 100 g-1 respectively, while that for the external carotid was higher at 129.9 +/- 10.2 GN X m-5 X s X 100 g-1. The impedance spectrum for the vertebral artery was of low impedance type, settling about a characteristic impedance of 2.01 +/- 0.28 GN X m-5 X s without significant oscillation, associated with the phase only becoming slightly positive above 10 Hz and reflexion coefficients of less than 0.25 by a frequency of 6 Hz. This was similar to the spectrum for the internal carotid artery and contrasted with the high impedance spectrum with major reflexion found for the external carotid artery.
在对六只麻醉犬进行的实验中发现，椎动脉对脑血流的贡献为69.2±1.7%，对头血流的贡献为41.5±2.5%。其输入特征为，椎动脉的血流量为0.71±0.05 ml·s⁻¹，输入阻抗为23.7±1.9 GN·m⁻⁵·s。相比之下，颈外动脉和颈内动脉的血流量分别为0.69±0.05和0.31±0.02 ml·s⁻¹，输入阻抗分别为23.9±2.1和52.1±2.7 GN·m⁻⁵·s。按每100 g组织标准化后，椎动脉和颈内动脉的阻抗相似，分别为18.6±2.0和19.1±1.5 GN·m⁻⁵·s·100 g⁻¹，而颈外动脉的阻抗较高，为129.9±10.2 GN·m⁻⁵·s·100 g⁻¹。椎动脉的阻抗谱为低阻抗类型，稳定在特征阻抗2.01±0.28 GN·m⁻⁵·s左右，无明显振荡，仅在10 Hz以上相位略有正值，且在6 Hz频率时反射系数小于0.25。这与颈内动脉的谱相似，与颈外动脉发现的具有主要反射的高阻抗谱形成对比。
