@article {Waugh902, author = {Jonathan B Waugh and Wesley M Granger}, title = {An Evaluation of 2 New Devices for Nasal High-Flow Gas Therapy}, volume = {49}, number = {8}, pages = {902--906}, year = {2004}, publisher = {Respiratory Care}, abstract = {BACKGROUND: The traditional nasal cannula with bubble humidifier is limited to a maximum flow of 6 L/min to minimize the risk of complications. We conducted a bench study of 2 new Food and Drug Administration-approved nasal cannula/humidifier products designed to deliver at flows \> 6 L/min. METHODS: Using a digital psychrometer we measured the relative humidity and temperature of delivered gas from each device, at 5 L/min increments over the specified functional high-flow range. RESULTS: The Salter Labs unit achieved 72.5-78.7\% relative humidity (5-15 L/min range) at ambient temperature (21-23{\textdegree}C). The Vapotherm device achieved 99.9\% relative humidity at a temperature setting of 37{\textdegree}C (5-40 L/min). CONCLUSIONS: Both devices meet minimum humidification standards and offer practical new treatment options. The patient-selection criteria are primarily the severity of the patient{\textquoteright}s condition and cost.}, issn = {0020-1324}, URL = {https://rc.rcjournal.com/content/49/8/902}, eprint = {https://rc.rcjournal.com/content/49/8/902.full.pdf}, journal = {Respiratory Care} }