""Reverse flow is really interesting, and we're uncertain if it harmful," Stenger said. "Reverse flow in the jugular vein could be completely harmless as the blood is simply leaving the head via one of the other venous pathways. However, reverse flow implies altered venous pressure dynamics, which could impact the ability of the brain to drain cerebral spinal fluid and possibly increase pressure in the brain."
https://amp.cnn.com/cnn/2019/11/15/health/astronaut-blood-flow-clot-scn-trnd/index.html
Here's the original paper:
Here's the original paper:
Assessment of Jugular Venous Blood Flow Stasis and Thrombosis During Spaceflight
"stagnant or reverse flow in the internal jugular vein was observed in 6 crew members (55%) on approximate flight day 50. Notably, 1 crew member was found to have an occlusive internal jugular vein thrombus, and a potential partial thrombus was identified in another crew member retrospectively."
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