re: I just had a colonoscopy this morning with Propofol, and damn that is one powerful drug

Ketamine is most often used in combinations with other drugs like propofol. Thus the term ketafol. Propofol used for endoscopies is also often used in combo with benzodiazepines (Versed) and opioids (Fentanyl). The comment earlier about “sleep apnea” (really obstructive sleep disorder) is a very true statement. Most problems during heavy sedation are airway in origin.