Oxygen enrichment of entrained room air during Venturi jet ventilation of children undergoing bronchoscopy.
Intermittent oxygen jet ventilation at an inspiratory:expiratory ratio of 1:3 was used to ventilate 15 children undergoing rigid Storz bronchoscopy for removal of inhaled foreign body. Oxygenation of the patient was continuously monitored by pulse oximetry. In all children SpO2 was above 95% when the bronchoscope was above the carina. When the bronchoscope was introduced into one of the bronchi, SpO2 decreased to 70-85% in five children. Delivery of a continuous flow of oxygen via a T-piece attached to the side-arm of the bronchoscope increased the SpO2 > 95% in the five children. Oxygen jet ventilation during bronchoscopy is based on the Venturi principle; the oxygen jet will entrain room air from the side arm of the bronchoscope which functions as an entrainment orifice. This will decrease the FIO2. The FIO2 can be increased by flowing oxygen continuously via the T-piece attached to the side arm of the bronchoscope.
Baraka
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Department of Anesthesiology, American University of Beirut, Lebanon.
D000293:Adolescent; D001980:Bronchi; D001999:Bronchoscopy; D002648:Child; D002675:Child, Preschool; D005260:Female; D005547:Foreign Bodies / Q000628:therapy; D006611:High-Frequency Jet Ventilation / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D007385:Intermittent Positive-Pressure Ventilation; D008297:Male; D010100:Oxygen / Q000008:administration & dosage*
D010100:Oxygen