Strange discovery in astronaut's bloodstream by NASA scientists

National Aeronautics and Administration (NASA) scientists have discovered new risk for humans in flight after y observed backwards blood flow in astronauts’ veins. Researchers performed assessment to find out impact of long-term exposure to a weightless environment during flight as it can result in a chronic headward blood and tissue fluid shift compared with upright posture on Earth. However, risks vanishes as soon as astronauts come bck to earth.

' net-forward movement'

Speaking to an American magazine, a senior NASA scientist Karina Marshall-Goebel said that y were t expecting such a result since it was never reported before. findings showed a strange phemen where blood in jugular vein began moving in opposite direction. Marshall-Goebel, who authored research paper, said that though it was sloshing back and forth a bit, re was net-forward movement.

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Blood clot in flight

As a part of research, six out 11 International Station crew members, demonstrated a stagnant or retrograde flow in internal jugular vein, one of most important parts of body. jugular vein drains deoxygenated blood from brain which is essential to reduce pressure and stalled blood flow can cause severe dam to internal organs. One of crew members even developed a clump of blood during flight.  astronauts without any clot-related symptoms were also given blood-thinning drugs for rest of ir time in orbit.

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'May have switched directions'

According to report, in-flight IJV measurements were acquired at approximately 50 days and 150 days into flight during rmal flight conditions as well as during use of lower body negative pressure. “Lower body negative pressure may be a promising countermeasure to enhance veus blood flow in upper body during flight,” read report. NASA scientists also said that blood may have switched directions citing similar phemen in patients with tumours where blood tries to find a different root to heart. y said that condition vanished after astronauts returned to earth.

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