My dad has a 70% blockage in his carotid artery. What can I do if I have explained what the risk is?

Debbie - this is the hardest of all situations - when a parent decides to just let things be. We know it will mean their passing away is more likely than if they didn't have something done. If it were my parent, I'd research all the non-invasive treatments available and discuss those as possibilities with him. I'd also tell him that you worry about him being in pain or having a massive stroke and being forced to move to a nursing home. Tell him you want to help him make decisions while he is in charge - you don't want to wait until he's forced into something - a situation where there is only ONE option left. If that doesn't work then, you have to accept his decision and expect that something will happen at some point. Easier said than done, I know - been there and still dealing with the guilt but it's getting better every day. You must tell yourself that you've tried, try to approach the situation with love and caring for his quality of life Best of luck.