Cowan F, Thoresen M
Pediatrics. 1985 Jun;75(6):1038-47.
A pulsed Doppler bidirectional ultrasound system has been used to measure alterations in the blood velocities in the superior sagittal sinus of the healthy term newborn infant in response to unilateral and bilateral jugular venous occlusion. These maneuvers were performed with the baby lying in different positions: supine, prone, and on the side (both left and right), the neck flexed or extended, and with the head in the midline or turned 90 degrees to the side (both left and right). Transfontanel pressure was also measured in these positions during occlusions. Results show that turning the head effectively occludes the jugular vein on the side to which the head is turned and that occluding the other jugular vein does not force blood through this functional obstruction. The effect of different forms of external pressure to the head on the superior sagittal sinus velocities was also examined. Alterations in velocities were frequently profound although they varied considerably from baby to baby. This work shows how readily large fluctuations in cranial venous velocities and pressures can occur in the course of normal handling of babies.
一种脉冲多普勒双向超声系统已被用于测量健康足月儿上矢状窦的血流速度变化，以响应单侧和双侧颈静脉阻塞。这些操作是在婴儿处于不同体位时进行的：仰卧位、俯卧位和侧卧（左右两侧），颈部屈曲或伸展，头部位于中线或向一侧（左右两侧）转动90度。在阻塞过程中，还在这些体位下测量了前囟压力。结果表明，转动头部可有效阻塞转向侧的颈静脉，而阻塞另一侧颈静脉并不会迫使血液通过这种功能性阻塞。还研究了头部不同形式的外部压力对上矢状窦血流速度的影响。尽管不同婴儿之间血流速度变化差异很大，但速度变化通常很显著。这项研究表明，在正常护理婴儿的过程中，颅内静脉血流速度和压力很容易出现大幅波动。
