An Alarming Discovery In an Astronaut's Bloodstream

Thelasko shared this article from the Atlantic about a surprising medical observation on the International Space Station: An astronaut was carrying out an ultrasound on their own body as part of a new study, guided in real time by a specialist on the ground. A similar test before the astronaut launched to space had come back normal. But now the scan showed a clump of blood... Before the astronauts launched, researchers measured blood flow in their jugular vein in seated, supine, and tilted positions. The readings looked normal. The researchers had the astronauts repeat the ultrasounds during their missions on the ISS. Scans showed that blood flow in the vein stalled in five of the 11 astronauts. "Sometimes it was sloshing back and forth a bit, but there was no net-forward movement," Marshall-Goebel says. Seeing stagnant blood flow in this kind of vein is rare, she says; the condition usually occurs in the legs, such as when people sit still for hours on a plane... All the astronauts were considered to be in good health before they launched. And when they came home, the conditions vanished in nearly all of them. When the researchers analyzed the data, they found that a second astronaut may have developed a blood clot no one had seen while they were in orbit. But no one experienced any health troubles. "None of the crew members actually had any negative clinical outcomes," Marshall-Goebel says. An associate professor of space medicine at the International Space University in France tells the Atlantic that the findings were compelling. "I think we need to understand this before we embark on long-duration missions where the astronaut would be so far away that we wouldn't be able to help them in the case of a medical emergency."

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