I am a 64-year-old man who has been having periodic shortness of breath for the past six months or so. This happens mostly upon exertion but sometimes ...

I am a 64-year-old man who has been having periodic shortness of breath for the past six months or so. This happens mostly upon exertion but sometimes occurs when I stand up.

I am a 64-year-old man who has been having periodic shortness of breath for the past six months or so. This happens mostly upon exertion but sometimes occurs when I stand up. I do have a family ...