I have only been seeing Dr. Stefek for less than a year at this point. I think he is very knowledgeable in his field of cardiology. If he feels that what he has been doing for you is not working as well as he feels it should he will suggest a specialist to see. In my case, I was not responding to the medications so we made some changes a few times. Then he suggested a specialist in my diagnosis and got me in to see him very soon.
I have great respect for Dr. Stefek as a cardiologist.