Table 2 Adverse events in two groups.

Adverse events	Standard monitoring group (n = 899)	Capnography monitoring group (n = 888)	P value
Any adverse sedation event	29 (3.3)	36 (4.1)	0.374
Vomiting / Retching	1 (0.1)	0 (0)	0.500
Muscle rigidity, Myoclonus	0 (0)	2 (0.2)	0.479
Hypersalivation	0 (0)	1 (0.1)	0.500
Paradoxical response	0 (0)	1 (0.1)	0.500
Prolonged recovery	0 (0)	1 (0.1)	0.500
Failed sedation	0 (0)	2 (0.2)	0.479
Bradycardia	25 (2.8)	24 (2.7)	0.888
Hypotension	5 (0.6)	4 (0.5)	1.000
Ventricular arrhythmias	0 (0)	2 (0.2)	0.479
Tactile stimulation	1 (0.1)	1 (0.1)	1.000
Antisialogogue	0 (0)	1 (0.1)	0.500
Reversal agents	0 (0)	1 (0.1)	0.500
Atropine to treat bradycardia	9 (1.0)	9 (1.0)	0.998
Ephedrine to treat hypotension	5 (0.6)	4 (0.5)	1.000
Intraoperative ventilation change		131 (14.8)
Apnea		603 (67.9)