@kayraymat some patients are in a state where they are not aware of what’s going on, and fight tubes and intravenous lines. In this case intervention is necessary, but if the patient has made a written decision for DNR that includes “no extraordinary measures”, intubating that person would fall under the “DNR” category. It’s usually people who are well into their eighties and beyond, who would add a written “no extraordinary measures” clause to the DNR. I am not an expert, however - it is just what I understand about DNR.

What I mean is, people requesting a DNR should be very specific about what they want before they are in a state where they cannot articulate it. In other words, make up a Living Will. Here’s what I found when I Googled that:
https://www.rvlaw.ca/living-wills-questions-and-answers/