The Science Journal of the American Association for Respiratory Care

2011 OPEN FORUM Abstracts

HIGH FLOW NASAL CANNULA OXYGEN THERAPY USING A SIMPLE MODIFICATION OF THE RESPIRONICS BIPAP VISION CIRCUIT.

Mark S. Siobal, Roberto Bautista; Anesthesia, SFGH/UCSF, San Francisco, CA

Background: High flow oxygen delivery by face mask using the Respironics BiPAP Vision has been previously described (Siobal RC Abstract 2005). Employing this simple modification to the Vision circuit also allows the delivery of high flow nasal cannula (HFNC) therapy at adjustable concentrations of oxygen. Method: With the device in the STD mode, IPAP and EPAP set to the same pressure, alarms for Low Pressure, Low Minute Ventilation, and Apnea disabled, with a pressure sensing line connected to the Plateau Exhalation Valve placed at the device outlet, the device delivers a constant flow rate at the approximate set FiO2 without any alarms. Flow measurements were performed at pressure settings of 4, 5, 6, 7, 8, 9, and 10 cm H2O using a Ventrak 1550 Respiratory Mechanics Workstation with the flow sensor positioned between the distal end of the circuit and Fisher Pakel HFNCs of varying sizes Results: Delivered flow rates between 24 and 52 L/min at pressure settings between 4 and 10 cm H2O were delivered with small, medium, and large HFNCs. Conclusion: HFNC therapy can be delivered with this simple modification to the Respironics BiPAP Vision circuit. Delivered flow rate is dependent on the pressure setting and the HFNC size.
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