Table 4

 Sedation agents used, maximum sedation level, and median recovery time

Sedation agentNumber of patientsLevel 1Level 2Level 3Level 4Level not recordedSuccessful proceduresMedian time to return to level 1
Midazolam only5733811235220 min
Midazolam and ketamine804400920 min
Ketamine only402200420 min
Midazolam, ketamine,11000010 min
and entonox
Entonox only1275000110 min
Entonox and midazolam193123011910 min