Hello My father who is 70 had bypass three years ago. He is a diabetic. But problem is he had severe chest pain few weeks ago and after several tests the doctor said it was due to blockages in the heart. What are the treatment options he has. Doc has asked him to double his heart medication for now. But please offer advice. I also saw this option online. (ESMR) Has anyone tried it or have any thoughts about it ?? ESMR ESMR stands for Extracorporeal Shockwave Myocardial Revascularization. ESMR can also be termed Non invasive Cardiac Angiogenesis therapy (Ni-CATh).