What is it about?
HFNC is an emerging therapy for respiratory failure but the extent of exhaled air dispersion during treatment is unknown. We examined exhaled air dispersion during HFNC therapy versus CPAP on a human patient simulator (HPS) in an isolation room with 16 air changes/hr.
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Why is it important?
Exhaled air dispersion from HFNC and CPAP is limited provided there is good mask interface fitting. However, exhaled air leakage to 620 mm laterally occurs when the connection between HFNC and the interface tube becomes loose.
Perspectives
In summary, exhaled air dispersion distance during application of HFNC at 60 L/min is shorter than those from application of CPAP via commonly used nasal pillows. However, sideway leakage to 620 mm may occur in the presence of a loose connection between HFNC and the interface tubing. Exhaled air dispersion during application of CPAP via the Quattro Air face mask and a single circuit is a safe option for patients with respiratory infections complicated by respiratory failure due to its negligible leakage through the circular vent holes if NIV via helmet through a double circuit is not available.
David Hui
Chinese University of Hong Kong
Read the Original
This page is a summary of: Exhaled air dispersion during high-flow nasal cannula therapy versus CPAP via different masks, European Respiratory Journal, January 2019, European Respiratory Society (ERS),
DOI: 10.1183/13993003.02339-2018.
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