van Cleef J F, Chleir F, Sentou Y
Hôpital Notre-Dame de Bonsecours, Paris.
Phlebologie. 1993 Jul-Sep;46(3):351-4; discussion 402-3.
The vena cava that has a preferential flattening axis, has also 2 wall sides and 2 borders. The back wall fits closely round on the back vertebral plane and the main colaterals terminate on the borders of the vein. TM echography perfectly analyses the movements of the walls of the vein, as well as the respiratory and auricular movements. In a lying patient, echo-doppler colour shows the expiratory acceleration of the vena cava flow in subrenal area associated with an inspiratory slowing down (as well as for the femoral veins) and the inspiratory acceleration of the flow in suprarenal area associated with an expiratory slowing down. In a standing patient, the vena is cylindrical. When he/she walks on a treadmill, the diameter of the cava seems to be constant, i.e. quasi identical to the aorta's, as fluxes vary in the aorta according to the ventricular contractions and in the LVC according to the patient's gait.
具有优先扁平化轴的腔静脉也有两个壁面和两个边缘。后壁紧密贴合在后背椎体平面上，主要侧支在静脉边缘终止。经胸超声心动图能完美分析静脉壁的运动以及呼吸和心房运动。在卧位患者中，彩色多普勒超声显示肾下区域腔静脉血流呼气时加速，同时吸气时减慢（股静脉也是如此），而肾上区域血流吸气时加速，呼气时减慢。在站立患者中，腔静脉呈圆柱形。当患者在跑步机上行走时，腔静脉直径似乎恒定，即与主动脉直径几乎相同，因为主动脉中的血流根据心室收缩而变化，下腔静脉中的血流则根据患者步态而变化。
