Detailed text transcripts for TV channel - KGO - 20120301:11:16:00
Consciousness at a wedding. but wherever it happens, it can be bewildering, even terrifying. >> my heart started racing very fast. >> reporter: cathy chandler is a chronic fainter. and her doctor says it's startling scenes like this that may hold clues to keeping her healthy. watch as astronaut heidi marie stephenshen collapses after returning from her first space mission. >> astronauts are very prone to fainting, dizziness. if you're in space, you're not using all your muscles, including your heart, because you don't have gravity to fight against. and so their heart sizes were decreasing. >> ...
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