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Related Experiment Videos

Multiple breath nitrogen dead space.

M Arborelius1, H E Rosberg, R Wiberg

  • 1Department of Clinical Physiology, Lund University, Allmänna Sjukhuset, Malmö, Sweden.

Clinical Physiology (Oxford, England)
|December 1, 1988
PubMed
Summary
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This study introduces a new method using nitrogen washout to measure functional dead space, which correlates well with physiological dead space and effectively assesses ventilatory efficiency in lung disease patients.

Area of Science:

  • Pulmonary Physiology
  • Respiratory Medicine
  • Diagnostic Methods

Background:

  • Ventilatory efficiency, crucial for gas exchange, is often assessed using physiological dead space (VD phys).
  • Measuring physiological dead space requires invasive arterial blood sampling.
  • A non-invasive method to assess ventilatory efficiency is needed.

Purpose of the Study:

  • To introduce and validate a non-invasive method for calculating functional dead space using multiple breath nitrogen washout (VDF N2).
  • To compare VDF N2 with physiological dead space (VD phys CO2).
  • To evaluate VDF N2's utility in assessing ventilatory efficiency in healthy individuals and patients with lung disease.

Main Methods:

  • Utilized multiple breath nitrogen washout with oxygen to calculate functional dead space for nitrogen (VDF N2).

Related Experiment Videos

  • Applied the method to 21 healthy volunteers, 18 patients with COPD, and 2 with acute bronchospasm.
  • Correlated VDF N2 with VD phys CO2 and forced expiratory volume in one second (FEV%).

    • Main Results:

    • VDF N2 showed a strong correlation with VD phys CO2 (r = 0.78) but was consistently higher.
    • In COPD patients, VDF N2 was inversely related to the degree of obstruction (r = 0.85).
    • Subjects with bronchospasm exhibited high VDF N2 relative to their FEV%.

    Conclusions:

    • Functional dead space measured by nitrogen washout (VDF N2) is a valid, non-invasive surrogate for physiological dead space.
    • VDF N2 effectively reflects ventilatory inefficiency and the degree of airway obstruction in lung diseases.
    • Subtracting predicted airway dead space from VDF N2 provides a measure of alveolar dead space, indicating uneven gas distribution.