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Related Experiment Videos

Decrease the flow setting to improve trans-nasal pulmonary aerosol delivery via "high-flow nasal cannula" to infants

Jie Li1, Lingyue Gong1, Arzu Ari2

  • 1Department of Cardiopulmonary Sciences, Division of Respiratory Care, Rush University Medical Center, Chicago, Illinois.

Pediatric Pulmonology
|March 29, 2019
PubMed
Summary

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Optimizing trans-nasal pulmonary aerosol delivery for infants and toddlers is crucial. Lowering nasal cannula flow below inspiratory flow significantly enhances lung deposition, with the highest delivery observed at 0.25 L/kg/min.

Area of Science:

  • Pediatric respiratory medicine
  • Pharmacokinetics and drug delivery

Background:

  • Trans-nasal pulmonary aerosol delivery is increasingly used for infants and toddlers.
  • Current methods report low lung deposition rates, necessitating optimization strategies.

Purpose of the Study:

  • To investigate factors influencing trans-nasal aerosol delivery in pediatric models.
  • To identify optimal conditions for improving lung deposition in infants and toddlers.

Main Methods:

  • Utilized infant (5 kg) and toddler (15 kg) airway manikins with breath simulators.
  • Tested various nasal cannula flow rates (0.125–2 L/kg/min) with a mesh nebulizer.
  • Measured albuterol deposition using UV spectrophotometry after elution from collection filters.

Main Results:

Keywords:
aerosolflowhigh-flow nasal cannulaoxygen inhalation therapy

Related Experiment Videos

  • Nebulizer placement at the humidifier inlet improved delivery compared to proximal placement, except at low flows in the infant model.
  • Higher aerosol deposition occurred when gas flow was below the patient's inspiratory flow (8.77% vs. 2.16%).
  • Deposition increased as gas flow decreased, peaking at 0.25 L/kg/min (11.29%). Gas flow was the primary predictor.

Conclusions:

  • Trans-nasal aerosol delivery significantly improves when nasal cannula flow is below the patient's inspiratory flow.
  • Reduced nasal cannula flow enhances aerosol deposition, with optimal delivery achieved at 0.25 L/kg/min.