Efficacy and safety of propofol target-controlled infusion combined with butorphanol for sedated colonoscopy

Table 4 Comparison of frequency of adverse events in perianesthesia among the different groups

Groups	n	Hypoxemia	Sinus bradycardia	Hypotension	Nausea, vomiting	Vertigo
Group C	38	5 (13.2%)	1 (2.6%)	1 (2.6%)	2 (5.3%)	4 (10.5%)
Group B1	36	2 (5.6%)	0 (0%)	0 (0%)	1 (2.8%)	3 (8.3%)
Group B2	32	3 (9.4%)	2 (6.3%)	0 (0%)	2 (6.3%)	3 (9.4%)