The Science Journal of the American Association for Respiratory Care

2005 OPEN FORUM Abstracts

EQUIPMENT INVESTIGATION OF VAPOTHERM® 2000i TO WARM -26ºC HELIOX GAS MIXTURES, 100% HELIUM, AND 100% OXYGEN TO 37ºC AND TO COOL 51ºC HELIOX GAS MIXTURES, 100% HELIUM, AND 100% OXYGEN TO 37ºC.



Steve T Polston, RRT, Norton Healthcare inc. Louisville, KY, Rebecca Brauch, University of Louisville School of Medicine, Kendra Sikes, EIT, University of Louisville Health Sciences Center, In K. Kim, MD, Assistant Professor, Pediatric Emergency Medicine, University of Louisville Health Sciences Center.

BACKGROUND: Helium-oxygen (heliox) gas mixtures have been shown to be beneficial for treating lower and upper airway respiratory diseases in both children and adults. Helium has 5.7 times the thermal conductivity of nitrogen. This thermal conductivity translates to increased heat or cold transfer for heliox relative to room air. Heliox cylinders are often stored outside and subjected to environmental temperatures in winter and summer. This study is an equipment investigation in order to determine the efficacy of the Vapotherm® 2000i to warm -26ºC to 37ºC (body temperature): 100% helium, 70% helium: 30% oxygen (70:30 heliox), 80% helium: 20% oxygen (80:20 heliox), and 100% oxygen and to cool 51ºC to 37ºC: 100% helium, 70:30 heliox, 80:20 heliox, and 100% oxygen.

METHOD
: First, steel H-cylinders of 100% helium, 100% oxygen, 70:30 heliox, 80:20 heliox were stored overnight in a deep freezer at -26ºC. A Vapotherm® 2000i was set at a temperature output of 37ºC using the -26ºC tanks for source gas. Temperature readings were taken with a Tenma® 72-6700 meter. Second, H-cylinders of 100% helium, 100% oxygen, 70:30 heliox, and 80:20 heliox were heated in an Olympic® medical sterile drier to 51ºC. The Vapotherm® 2000i was set at a temperature output of 37ºC using the 51ºC tanks for source gas. Temperature readings were taken with a Tenma® 72-6700 meter.

RESULTS: Utilizing the -26ºC tanks for source gas, 100% oxygen displayed an output temperature range of 32.2-33.9ºC. The 80:20 heliox displayed an output temperature range of 32.2-33.9ºC. The 70:30 heliox displayed an output temperature range of 30.0-33.9ºC. One hundred percent helium had an output temperature range of 32.2-38.3ºC. Utilizing the 51ºC tanks for source gas, 100% oxygen displayed an output temperature range of 32.2-34.4ºC. The 80:20 heliox displayed an output temperature range of 33.3-33.9ºC. The 70:30 heliox resulted in output temperature ranges of 33.3-38.3ºC. One hundred percent helium resulted in output temperature range of 33.3-37.8ºC.

CONCLUSION
: Caution should be exercised in administering

-26ºC or 51ºC source gases using the Vapotherm® 2000i. Output temperature monitoring may be considered upon administration to patients in order to prevent the risk of hypothermia.



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