<s>[INST] I am currently 29 years old. 6 years ago (age 23), I had to have an emergent double cardiac bypass related to inflammatory occlusion from my Takayasus aortitis. I am otherwise very healthy an have not had any complications following surgery and my grafts are patent. Is it okay for me to ride steel roller coasters? Is there anything about the shifts in gravity that would be contraindicated? [/INST] Thanks for your question on Chat Doctor. I can understand your concern. In my opinion, you should not ride on any roller coaster ride. These rides can damage operated vessels. Actually, there is sign board stating that bypass patients are not allowed in roller coasters. This is because they are not safe such patients. So better not to take ride in such roller coasters as it can cause sudden death in such patients. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks </s>