The Science Journal of the American Association for Respiratory Care

2010 OPEN FORUM Abstracts

A COMPARISON OF HELIOX CONSUMPTION BETWEEN RESPIRONICS VISION INTERNAL OXYGEN MIXING VERSUS CIRCUIT BLEED-IN OF 80:20 HELIOX.

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

BACKGROUND: We compared two methods of adding heliox into a Respironics Vision to determine the rate of heliox consumption. METHODS: First; we connected a heliox tank to the air inlet of a blender combined with an O2 wall source, to power the system. Vision FIO2 was set to 100% and delivered FIO2 was controlled by the blender. Ventilator settings, rate=24, ITime=0.8, IPAP/EPAP=16/5, delivered FIO2=0.4. The leak test was performed and the system was connected to a Michigan Test Lung (MTL), compliance =0.03, resistor 2. The delivered VT measured on the MTL was 500 mL. The ventilator was operated for 20 minutes and the heliox consumption was 600 psi. Second; we connected the Respironics Vision from a wall O2 source and bled-in heliox into the circuit, at the outlet of the ventilator. The test system was operated at the same settings as above, with a bleed-in of 10 LPM except the Vision FIO2 set at 1.0, achieving a delivered FIO2 of 0.39. We also tested a 15 LPM bleed-in with the settings as above except the Vision FIO2 set at 1.0, achieving a delivered FIO2 of 0.27. Total run time was 24 minutes with the bleed-in of 10 LPM with a heliox consumption of 170 psi, and 5 minutes with the bleed-in 15 LPM, with a heliox consumption of 50 psi. RESULTS: With the Vision FIO2 controlled by the blender, heliox consumption was 30 psi/minute, a full H cylinder would last 67 minutes. With the Vision operated on wall O2 source and heliox bleed-in at 10 LPM, heliox consumption was 7 psi/minute, a full H cylinder would last 285 minutes. With the Vision operated on wall O2 source and heliox bleed-in at 15 LPM, heliox consumption was 10 psi/minute, a full cylinder would last 200 minutes. CONCLUSION: The bleed-in method into a Respironics Vision at both 10 LPM and 15 LPM consumed less heliox than when the Respironics Vision FIO2 was controlled by the internal blender. Sponsored Research - None