title: Normocapnic anaesthesia for intraocular surgery.
abstract: Measurement of intraocular pressure (IOP) by applanation tonometry in 23 patients undergoing lens extraction showed that a normocapnic general anaesthetic technique with controlled ventilation of the lungs (IPPV) reliably reduced the IOP by 50% for the duration of the operative period. This was not associated with large falls in systemic arterial pressure which are often a feature of spontaneously breathing halothane anaesthesia for eye surgery. Normocapnia and IPPV were easy to achieve by use of the single-limb coaxial Bain anaesthetic breathing circuit in conjunction with an electrically driven, small, and inexpensive ventilator while the anesthetic mixture of 33% oxygen and 0.5% halothane in nitrous oxide was delivered at a rate of 70 ml/kg body weight per minute.
mesh_terms: D000328:Adult; D000368:Aged; D000769:Anesthesia, Inhalation / Q000295:instrumentation / Q000379:methods*; D001794:Blood Pressure; D002245:Carbon Dioxide / Q000097:blood; D002387:Cataract Extraction; D005260:Female; D006221:Halothane; D006801:Humans; D007385:Intermittent Positive-Pressure Ventilation; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged
chemical_list: D002245:Carbon Dioxide; D006221:Halothane