Oh, yes.
I've been a medfetter since my early childhood, in the early 80's, before I knew what fetishes were. My very first medical fetish was seeing a girl go under the "black beauty" anesthesia mask. But fairly quickly, it morphed into seeing a girl be required to wear a mask because of her immune system.
In 2006, at age 30, I was on deviantART and saw a girl doing modeling while wearing a half mask cartridge respirator (like in my avatar, but very dark blue. Almost matte black). Reading her bio, I saw that she had cystic fibrosis, a terminal disease of the lungs and pancreas. I knew that patients with CF had compromised immune systems, and so usually needed to wear masks in public (at least that's how it seems to be in America).
I very sheepishly PMed her and explained that I like her photos of her in her mask, and that that's actually a fetish of mine, and that I understand CF from documentaries (which invariably contained girls in masks). I gave her my AIM address and within an hour, she chatted me up. We chatted for a while, and talked about masks and such, and planned out a commission. She was quite comfortable with it.
Later on in our friendship, I even traveled to meet her at a party held to raise funds for her transplant. She was wearing a white lace "fashion mask", which is supposed to be rated N95, and then later on she switched into her big respirator. Both were stunning, but I liked her respirator better. I think in a way, it actually looks kind of like the "black beauty", but with big cartridges sticking out the sides, and big black straps to hold it on her mouth.
I Can Breathe "fashion mask": https://icanbreathe.com/products/icb-honeycomb-mask-with-classic-coconut-activated-carbon-filter
North 5500 cartridge respirator: (from her modeling site ) https://img00.deviantart.net/5396/i/2006/348/4/a/guilty_as_seen_by_spirit_of_kina.jpg
As for anesthesia or oxygen scenes, I don't really think about how it affects the professionals. As for te patient, yes I do think about it. I think about how the girl has no choice, really, but to be masked up in public, and she may not see or understand the sexual side of that, and is probably a bit embarrassed by having to wear a mask into, say, a grocery store. So I don't make any comments on pics that would make me stand out.
I still think about the girl I met to this very day, even though she passed away a few years ago, and we had fallen out years before. My most intense fantasies still involve her. Sometimes so intense, it's a bit painful. A real feeling of having to suppress my fetish. Sometimes looking at pics helps, and sometimes it hurts. Like, "why can't I have that girl?"