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Related Experiment Videos

[Basic evaluation of nitric oxide inhalation therapy]

H Kobayashi1, Y Takahashi, H Mitsufuji

  • 1Department of Medicine, School of Medicine, Kitasato University, Kanagawa, Japan.

Nihon Kyobu Shikkan Gakkai Zasshi
|December 1, 1995
PubMed
Summary

Inhaled nitric oxide (NO) dilates pulmonary vessels near alveoli in ARDS models. This improves oxygenation (PaO2) without significantly affecting blood

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Area of Science:

  • Pulmonary Medicine
  • Cardiovascular Physiology
  • Respiratory Pharmacology

Background:

  • Acute Respiratory Distress Syndrome (ARDS) involves pulmonary vasoconstriction and impaired gas exchange.
  • Inhaled nitric oxide (NO) is a potential vasodilator for treating ARDS.
  • Understanding NO's precise action site and safety profile is crucial.

Purpose of the Study:

  • To determine the site of action of inhaled NO in an ARDS model.
  • To establish the dose-response relationship between inhaled NO and arterial oxygen tension (PaO2).
  • To assess the safety of NO inhalation by measuring nitrosyl-hemoglobin (Hb-NO) and nitrogen dioxide (NO2) levels.

Main Methods:

  • Utilized an ovine model of ARDS induced by lung lavage.
  • Employed pressure-flow plots to identify the site of NO action.

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  • Measured PaO2, pulmonary artery pressure, Hb-NO in arterial and mixed venous blood, and NO2 levels.

    • Main Results:

    • Pressure-flow plots indicated inhaled NO acts near the alveoli.
    • Inhaled NO decreased pulmonary artery pressure and increased PaO2, peaking at 10-20 ppm.
    • Hb-NO levels remained <0.1% of total hemoglobin, and NO2 generation was negligible (<0.1 ppm).

    Conclusions:

    • Inhaled NO effectively dilates pulmonary vessels near alveoli in ARDS.
    • NO inhalation improves oxygenation without compromising blood's oxygen-carrying capacity.
    • The studied NO inhalation system is safe, producing minimal NO2.