Hi tks:
That is good to know that your mother-in-laws heart and lungs look okay. That would be the first place to look if she is having problems with shortness of breath. There are several things that can cause shortness of breath, even medications can. I've listed a few other things that may be causes of shortness of breath: anxiety, anemia, blood disorders, pulmonary hypertension, neurological conditions.
Hope this helps,
Take care,
Tara
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