“…A range of sedation strategies were reported, including chloral hydrate, ketamine, and nitrous oxide [ 26 , 28 , 29 , 30 , 31 , 34 , 35 , 38 , 39 , 47 , 48 , 49 , 54 , 57 , 63 , 69 , 73 ]. Anorectal manometry was performed without sedation in nine studies [ 14 , 22 , 32 , 43 , 50 , 52 , 55 , 57 , 67 ]. Reported approaches to preparation and sedation are summarized in Table 2 .…”