Mechanistic Understanding of High Flow Nasal Cannula Therapy and Pressure Support with an In Vitro Infant Model.

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ID: 63015
2019
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Abstract
Despite the increased use of high flow nasal cannula therapy, little has been done to predict airway pressures for a full breath cycle. A 3-month-old infant in vitro model was developed, which included the entire upper airway and the first three bifurcations of the lungs. A breathing simulator was used to create a realistic breath pattern, and high flow was provided using a Vapotherm unit. Four cannulas of varying sizes were used to assess the effects of the inner diameter and nasal occlusion of the cannulas on airway pressures. At 8 L min, end expiratory pressures of 0.821-1.306 cm HO and 0.828-1.133 cm HO were produced in the nasopharynx and trachea, respectively. Correlations were developed to predict full breath cycle airway pressures, based on the gas flow rate delivered, cannula dimensions, as well as the breathing flow rate, for the nasopharynx and trachea. Pearson correlation coefficients for the nasopharynx and trachea correlations were 0.991 and 0.992, respectively. The developed correlations could be used to determine the flow rate necessary for a cannula to produce pressures similar to CPAP settings. The proposed correlations accurately predict the regional airway pressure up to and including 7 cm HO of support for the entire breath cycle.
Reference Key
wilkins2019mechanisticannals Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Wilkins, John V;Gardner, Michelle T;Walenga, Ross;Hosseini, Sana;Longest, P Worth;Golshahi, Laleh;
Journal Annals of biomedical engineering
Year 2019
DOI
10.1007/s10439-019-02377-z
URL
Keywords
pediatric occlusion respiratory support noninvasive ventilation positive distending pressure predictive correlations test lung model

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