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Lung function measured by impulse oscillometry and spirometry following eucapnic voluntary hyperventilation.

Kenneth W Rundell1, Tina M Evans, Jennifer M Baumann

  • 1Marywood University, 2300 Adams Avenue, Scranton, PA 18509, USA. rundell@marywood.edu

Canadian Respiratory Journal
|August 19, 2005
PubMed
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Impulse oscillometry (IOS) effectively measures airway calibre changes and can help determine airway hyperresponsiveness (AHR). This lung function test supplements spirometry for comprehensive evaluation.

Area of Science:

  • Pulmonary Physiology
  • Respiratory Medicine
  • Diagnostic Tools

Background:

  • The established efficacy of impulse oscillometry (IOS) for assessing airway caliber changes remains under investigation.
  • Spirometry is a standard tool, but its limitations in certain assessments necessitate exploring alternative methods.

Purpose of the Study:

  • To evaluate lung function changes following eucapnic voluntary hyperventilation (EVH).
  • To compare IOS-derived indices with spirometry-based maximal expiratory flow measurements.
  • To assess IOS's utility in identifying airway hyperresponsiveness (AHR).

Main Methods:

  • Twenty participants (10 with AHR, 10 without) underwent IOS and spirometry.
  • EVH involved inhaling 5% CO2 in a nitrogen balance for 6 minutes.

Related Experiment Videos

  • Measurements included forced expiratory volume in 1 second (FEV1), airway resistance (R5), reactance, resonant frequency (Fres), and area of reactance (AX).

    • Main Results:

    • Baseline IOS parameters (R5, AX) correlated with FEV1 decline post-EVH.
    • Airway hyperresponsive subjects showed significantly greater FEV1 falls and changes in IOS indices (R5, Fres, reactance, AX) compared to normal subjects.
    • Specific IOS thresholds (≥50% change in R5, ≥12 cm H2O/L in AX) demonstrated high sensitivity (90%) for detecting a 10% FEV1 fall at 80% specificity.

    Conclusions:

    • Impulse oscillometry is a viable method for detecting airway hyperresponsiveness.
    • IOS serves as a valuable supplementary tool to spirometry in lung function assessments.
    • IOS provides objective measures of airway caliber changes, aiding in the diagnosis of respiratory conditions.