The Science Journal of the American Association for Respiratory Care

2010 OPEN FORUM Abstracts

A COMPARISON OF DELIVERED FIO2 WITH A 10 LPM 80:20 HELIOX BLEED-IN ON A RESPIRONICS VISION AT DIFFERENT SET FIO2’S AND TIDAL VOLUMES

Shannon Cocilova, Stanley Baldwin, Michele Grainger, Michael H. Terry; Respiratory Care, Loma Linda University Medical Center, Loma Linda, CA

BACKGROUND: We measured the effect of a 10 LPM 80:20 Heliox bleed-in on the delivered FIO2 for a Respironics Vision delivery system. We were also concerned that combining a fixed bleed-in with different tidal volumes might lead to significant variation in delivered FIO2. So, we compared three delivered tidal volumes and measured FIO2. METHODS: We connected the Respironics Vision to a wall O2 source and bled-in 80:20 heliox into the circuit, (Universal, Non-invasive Ventilator Circuit, Hudson RCI), at the outlet of the ventilator at 10 LPM. Ventilator settings were rate=24, ITime=0.8, IPAP/EPAP=16/5. The leak test was performed and the system was connected to a Michigan Test Lung (MTL). Set FIO2 was varied in four steps, 1.0, 0.7, 0.5 & 0.3. The delivered VT was assessed on the MTL (volumetric measurement) and was varied by changing the compliance and resistance to achieve three VT’s 800, 500 & 200 mL. The delivered FIO2 was measured distal to the proximal pressure port, at the patient connection with a MiniOx III O2 analyzer (Catalyst Research). The ventilator was operated for 5 minutes between changes of Set FIO2 or VT. FIO2 stability was reached within 2 minutes of each change. RESULTS: A Set FIO2 of 1.0 resulted in a delivered FIO2 of 0.4. Decreasing the Set FIO2 decreased delivered FIO2, (see figure 1). We did not observe significant variation in delivered FIO2 with changes in delivered VT. CONCLUSION: The bleed-in method into a Respironics Vision at 10 LPM 80:20 heliox resulted in a stable delivered FIO2 at the settings tested. Sponsored Research - None