is angina an arterial problem or are veins also responsible . I have already have a stent, but symptom s of angina Tightness in the upper chest during exercise have recently appeared . I now have been prescribed Isosorbide mononitrate starting on 30mg and after 7 days 60mg. I am happy to continue with my surgeon, but was considering whether another stent might be the answer. I am a 77 year old male. (Most of my male family members have had and died from heart ailments) So far I feel very lucky, but want my luck to continue. Thanks for you time Eric Fry (Australia)