Yea, that is why I mentioned it. My sister in law was getting winded and tired when she ordinarily should not have been. This went on for a couple of years, with her doc (a GP) postulating all kinds strange diseases and syndromes that made no sense to me.

An RN friend of hers suggested she see a cardiologist, and a stress test revealed a 90% blockage. She got a stent and she's now fine.

And she fired her GP. Not recommending a cardio workup was malpractice, and may have killed her.