Carbon dioxide insufflation during colonoscopy in deeply sedated patients

Table 1 Patient characteristics, procedure duration, sedation parameters, and capnographic readings with air and CO₂ insufflation during colonoscopy

	Air	CO2	P value
Total procedures	72	70	NS
Age (mean) (yr)	59.97	58.26	NS
Male:female ratio	33:39	45:25	NS
Insertion time (min)	9.88	7.29	0.0083
Withdrawal time (min)	6.69	7.29	NS
Cecal intubation rate (%)	94.4	100	0.012
Sedation used
Propofol (mg)	185.97	184.14	NS
Midazolam (mg)	0.78	0.66	NS
Fentanyl (mg)	32.64	34.93	NS
Sedation (nurse assessment)	1.00	1.09	NS
Discomfort (nurse assessment)	0.69	0.39	0.0155
Pain (patient assessment)	0.82	0.46	0.0228
Bloating (patient assessment)	0.97	0.36	0.001
Capnography at commencement	18.53	20.21	NS
Capnography at caecum	15.1	19.28	NS

NS: Not significant.