Diaphragm...: If you get increased shortness of breath when you lie flat, this could be a sign of diaphragmatic weakness or even paralysis. If your oxygen level decreases when you lie flat, this could be the reason. There are tests to determine if your diaphragms are weakened so see your doctor and ask about this testing, including ultrasound of your diaphragms, pulmonary function testing upright and supine, et.
Answered 9/3/2013
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