The Cardiologist who performed my heart catheterization has directed me to take 2- 20 mg Isosorbide dinitrate daily as well as my usual dosages of blood pressure medications. It seems to be controlling the angina pectoris fairly well, but it's still disconcerting to deal with since I'm a widow and live alone. I am scheduled to see his PA tomorrow morning. It would seem that a myocardial bridge is not considered life threatening, is this accurate? Thank you.