title: CPAP with air and oxygen to non-ventilated lung improves oxygenation during one lung anaesthesia.
abstract: Ten adult patients undergoing one lung ventilation for elective thoracotomy were selected. All these patients failed to maintain oxygen saturation (SaO2) > 90% despite administration of 100% oxygen to the non-ventilated lung (NVL). These patients were studied for the efficacy of continuous positive airway pressure (CPAP) of the NVL using air and oxygen combination (FiO20.5) employing a variable FiO2CPAP system. It was observed that application of CPAP (5-10 cm H2O) with a mixture of air and oxygen to the NVL increased the SaO2 > 90% in all these patients. This could be attributed to nitrogen in air which prevented absorption atelectasis in the NVL. This produced a better ventilation/perfusion ratio and hence the increased oxygen saturation.
authors.affiliation: Department of Anaesthesiology, King Fahad National Guard Hospital, Riyadh, Saudi Arabia.
authors.forename: M
authors.initials: M
authors.lastname: Maroof
authors.forename: R M
authors.initials: RM
authors.lastname: Khan
authors.forename: T H
authors.initials: TH
authors.lastname: Bhatti
mesh_terms: D000328:Adult; D000769:Anesthesia, Inhalation; D006801:Humans; D008168:Lung / Q000187:drug effects / Q000378:metabolism; D008875:Middle Aged; D010100:Oxygen / Q000008:administration & dosage; D010101:Oxygen Consumption; D011013:Pneumonectomy / Q000379:methods*; D011175:Positive-Pressure Respiration; D013997:Time Factors
chemical_list: D010100:Oxygen