title: A randomised controlled trial of periconal eye blockade with or without ultrasound guidance.
abstract: We randomly allocated 129 participants with normal eyes to periconal blockade with (n = 69) or without (n = 60) ultrasound guidance before cataract surgery. There was no difference in the rates of complication, 1/69 and 0/60, respectively, p = 1.0. The rate of intraconal needle placement was 1/69 with ultrasound and 12/60 without ultrasound, a relative risk (95% CI) of 0.07 (0.01-0.55), p < 0.0001.
authors.affiliation: Department of Anaesthesiology, Botucatu School of Medicine, UNESP, São Paulo, Brazil; Benjamin Constant Institute for the Blind, Rio de Janeiro, Brazil.
authors.forename: I E
authors.initials: IE
authors.lastname: Najman
authors.forename: R
authors.initials: R
authors.lastname: Meirelles
authors.forename: L B
authors.initials: LB
authors.lastname: Ramos
authors.forename: T C F
authors.initials: TC
authors.lastname: Guimarães
authors.forename: P
authors.initials: P
authors.lastname: do Nascimento
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000779:Anesthetics, Local / Q000008:administration & dosage; D002387:Cataract Extraction / Q000379:methods*; D005123:Eye; D005260:Female; D006801:Humans; D056965:Injections, Intraocular; D008297:Male; D019300:Medical Errors / Q000517:prevention & control / Q000706:statistics & numerical data; D008875:Middle Aged; D009339:Needles; D009407:Nerve Block / Q000009:adverse effects / Q000379:methods*; D018084:Ultrasonography, Interventional; D055815:Young Adult
chemical_list: D000779:Anesthetics, Local