Hi, My mother is 51 years old. On 26th Jan 2016, she felt angina and we took her to hospital. After doing an angiogram doctor told she had more than 75% stenosis to LAD and advised for a PTCA asap. On 16th Feb 2016 she was gone through an angioplasty and a drug eluting stent has been placed to her LAD. But doctor told me during the procedure a side branch was blocked. I came to know that the side branch is D1 artery. After the procedure, she felt a severe chest pain for 24 hours. I dont know how much it is blocked. Now she is having a chest pain on her left breast and after sometime autometically the pain reduced to zero. I am very worried. I really need to know how much that D1 artery blockage will create problems? Please help me.