A DNR is very specific medical orders. What you’re talking about is more vague than that. If you have a DNR they will NOT resuscitate you no matter the cause or opinions of the medical professionals. Your wish is to not be resuscitated medically and they honor that. Your heart stops and they can’t and won’t do anything. Based on your feelings you do Not want a DNR but should write up a living will and make instructions for your next of kin or whomever you want to have power over these decisions about what threshold you’re willing to go to and what you do or do not want them to do.