Acute coronary syndrome. Response kind!

I have complaint of chronic obstructive pulmonary disease since 2010. I Developed complaints of dyspnea on exertion since 15 days. After recent tests of ECG, ECHO and coronary angiography I was suggested for coronary artery disease. The report says that I have 70% blockage in my left artery. I have attached all the recent reports for lungs (COPD) and heart (acute coronary syndrome). Though the doctor have suggested me for angioplasty with stent and he was open for a second opinion from the other doctors. I was hoping if you could suggest me some other options for the treatment (other than angioplasty). So far I haven't experienced any chest pain and I was wondering if there is any injectable medication though which the blockage could be removed. Also it will be very helpful if you could tell me about angioplasty without stent. Looking forward for your response Kind regards R.H.Khan