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Passing out on the toilet from the vagal response is caused by bearing down to pass the bowel movement. Bearing down triggers the vagal response which slows the heart rate way down and causes her to pass out and I imagine the slow heart rate is lasting for a while which is causing the extreme weakness afterwards. She should try not to bear down so hard or so long to pass the stool.
Hopefully the doc can give her something for the orthostatic hypotension (passing out from the blood pressure drop when sitting or standing up). I think she may be invoking the vagal response when she is scooting up in the chair.
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 Gayle
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