title: O2 administration by a nasal probe improves respiration in cataract surgery after retrobulbar anesthesia.
abstract: We measured certain respiratory conditions (respiratory rate [RR], oxygen saturation [SO2], and end-expiratory carbon dioxide partial pressure [pCO2]) of 31 patients undergoing planned cataract surgery using local anesthesia in order to determine the effects of administering pure oxygen (3 L/min) by a nasal probe in 10 of them. In the patients who did not receive pure oxygen, at the end of surgery the mean RR was 15.8 +/- 4.4/min (maximum, 21; minimum, 6.4/min); the mean SO2 was 86.9% +/- 6.6% (maximum, 98%; minimum, 74%; in 11/25 patients, the SO2 was lower than 90%); and the mean pCO2 was 34.9 +/- 7.7 mm Hg (maximum, 46.5; minimum, 12.15; in 4/25 patients, the pCO2 was greater than 45 mm Hg). In the patients who received pure oxygen by a nasal probe, the mean SO2 increased intraoperatively from 80.6% +/- 5.8% to 96.9 +/- 2.9% (in no patients was SO2 lower than 90%). Therefore we recommend an intraoperative administration of pure oxygen by a nasal probe.
authors.affiliation: Department of Ophthalmology, University Erlangen-Nuernberg, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Michelson
authors.forename: B
authors.initials: B
authors.lastname: Naujoks
mesh_terms: D000281:Administration, Intranasal; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000772:Anesthesia, Local; D002387:Cataract Extraction; D006439:Hemodynamics; D006801:Humans; D007910:Lenses, Intraocular; D008875:Middle Aged; D009915:Orbit; D010101:Oxygen Consumption; D010102:Oxygen Inhalation Therapy; D011897:Random Allocation; D012119:Respiration / Q000502:physiology*