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Related Experiment Videos

Nasal highflow eliminates CO2 from lower airways.

Jens Bräunlich1, Friederike Goldner1, Hubert Wirtz1

  • 1Department of Respiratory Medicine, University of Leipzig, Liebigstraße 20, 04103 Leipzig, Germany.

Respiratory Physiology & Neurobiology
|April 12, 2017
PubMed
Summary

Nasal highflow (NHF) effectively reduces carbon dioxide in the lower airways, independent of airway pressure. This CO2 wash-out mechanism is key to NHF

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Area of Science:

  • Respiratory Physiology
  • Critical Care Medicine

Background:

  • Nasal highflow (NHF) shows promise for hypoxemic respiratory failure.
  • Mechanisms behind NHF's effectiveness in hypercapnia are not fully understood.
  • Upper airway wash-out is a proposed mechanism, but lower airway effects are unclear.

Purpose of the Study:

  • To investigate the CO2 wash-out effect of NHF in the lower airways.
  • To evaluate the role of NHF in reducing hypercapnia.

Main Methods:

  • A sheep lung model was utilized to assess CO2 wash-out.
  • Measuring and insufflation catheters were placed in the lower airways and tracheal space.
  • The lung was not ventilated to isolate NHF effects.

Main Results:

Keywords:
HypercapniaNHFNasal highflowType-II-respiratory failureWash-out

Related Experiment Videos

  • NHF decreased CO2 levels in both the lower airways and tracheal space.
  • CO2 reduction was dependent on the flow rate of NHF.
  • A concurrent increase in airway pressure was observed.

Conclusions:

  • NHF effectively reduces lower airway CO2 in a flow-dependent manner.
  • This CO2 wash-out effect is a significant factor in NHF's efficacy for hypercapnia.
  • The mechanism is independent of increased airway pressure or CO2 rebreathing.