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low o2 when lying down
My cardiologist sent me to a sleep clinic to see if there was a sleep apnea problem.  The first thing they did in preparation for the sleep study was to check my blood O2 level.  It remains at 98 or 99 while I'm active, but the moment I lie down, it goes to about 72.  I watched the gizmo for about an hour after going to bed. The results were very consistent:  up- about 98 or 99, down-about 72 or 73.  The sleep specialist wanted a sleep study right away.  I was not able to schedule for 5 weeks, so I'm going in July 13th.  After reading some postings on this site, I'm a little worried.  Should I try to get O2 therapy before the sleep study?  I had no idea that I might be at risk for stroke or heart attack.  I've always just watched my cholesterol (never over 120), triglycerides, etc.
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