@OverRainbow "Just an opinion, but given your case because of your condition the route used was medically indicated?"
Among other bodily repairs, I required facial reconstructive surgery. For over three months after the accident, anything I could "eat" had to fit in a straw. Lol. I had to be taught how to swallow, and it was painful.
In its day (nearly 40 years ago), I'm sure they felt the route was medically indicated. Likely today, they'd use less invasive means.
What I remember, in the ICU for 24 hours, they placed a tiny sensor into my rectum that monitored my temp continuously. I was so drugged up at the time, I didn't know it was there until a nurse removed it.
Transferred to a med-surg patient room, nurses tools rectals with an electronic probe hooked to a unit beside the bed. It was uncomfortable being turned on my side, but the probe took only 10 to 15 seconds until I heard a beep. Sometimes a nurse would do a temp check in the middle of the night, but with the sleep medication they gave me, I was only faintly aware what was happening.
When at home, a visiting nurse started by taking axillary (underarm) temps with a glass thermometer, and it worked OK. That changed on the third day when I started getting terrible headaches and a low-grade fever. Then she wanted it taken in the butt and also trained my husband to do it. They got to laughing, and I got sooo upset at them because it hurt so much to laugh.
My husband joked that he never knew someone who had such an intimate relationship with a thermometer. By the way, we still have that thermometer, and it's still spot-on accurate.