PCakes, I don't even know. I am not sure if it is discussing the jugulars when supine or upright?
http://journals.lww.com/anesthesiology/ ... us.36.aspx
The development of severe neurologic dysfunction after surgery and anesthesia is rare in children and typically results from hypoxia, emboli, or hemorrhage in children with congenital heart abnormalities. The neurologic complication described here, however, occurred in a child without cardiac disease, and in the absence of hypoxia. The child was hypotensive for a 1-h period, but the recorded low blood pressure (50-70 mmHg) alone would not be expected to produce global cerebral ischemia. The complication seen in this child is thought to be the result of bilateral jugular venous occlusion combined with hypotension. The left IJV was occluded by the catheter-sheath in combination with a pressure dressing, whereas the right IJV was compressed after neck rotation by the invisible subcutaneous loop of the Broviac catheter.
Blood drains from the brain by two major routes: the jugular veins and vertebral venous plexus. The vertebral venous plexus is a major source of cerebral venous drainage only in the upright position, [1,2] and it is generally assumed that in the supine position, the jugular veins are the main cerebral venous drainage routes. It has been shown in animals that ligation of IJVs affects venous return from the cranial cavity and results in intracranial hypertension.  Similar events have been seen in humans. [4-6] It is likely that impairment of venous outflow is the main cause of these abnormal changes within the cranium. Further, impairment of venous return is likely to influence the reabsorption of cerebral spinal fluid possibly contributing further to intracranial hypertension and edema.  In the supine position, head rotation alone has an effect on IJV flow and increases the intracranial pressure (ICP), particularly with rotation 90 [degree sign] to the right. Because the left IJV often is smaller than the right IJV, there is a greater increase in ICP with head rotation to the right in patients with a baseline ICP greater than 10mmHg compared with that on head rotation to the left. [1,8] Studies using the range-gated Doppler technique have shown that rotation of the head 90 [degree sign] to the side completely obstructs jugular venous flow on that side.  Early recognition of jugular venous obstruction is necessary to avoid progressive cerebral injury.
I can comment on this later, but I bolded some of what seemed relevant. This was a tragic situation where a child undergoing abdominal surgery had both jugulars obstructed.