i saw that also. Of interest to some may be that it was used and taught as part of an anesthesia technique in outpatient dentistry by a guy named jorgensen. I believe he taught this at Loma Linda school of dentistry, but my recollection may be incorrect. https://www.dentaldevotee.com/2020/07/jorgensen-technique-of-iv-sedation.html

i saw that also.