An Evaluation of 2 New Devices for Nasal High-Flow Gas Therapy

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°C). The Vapotherm device achieved 99.9% relative humidity at a temperature setting of 37°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's condition and cost.