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Short-term variability of nitric oxide diffusing capacity and its components.

Juan M Murias1, Gerald S Zavorsky

  • 1Department of Anesthesia, McGill University Health Center, Montreal, Quebec, Canada.

Respiratory Physiology & Neurobiology
|January 16, 2007
PubMed
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Short-term variability in nitric oxide diffusing capacity (DL(NO)) was assessed in healthy individuals. Results show DL(NO) remains stable, establishing benchmarks for detecting true physiological changes in patients.

Area of Science:

  • Pulmonary Physiology
  • Respiratory Medicine
  • Diagnostic Testing

Background:

  • Monitoring nitric oxide diffusing capacity (DL(NO)) requires differentiating biological variation from actual changes in alveolar-membrane conductance.
  • Short-term variability of single-breath DL(NO) has not been previously established, hindering accurate clinical interpretation.

Purpose of the Study:

  • To determine the short-term variability of single-breath DL(NO) in healthy subjects.
  • To establish reproducibility metrics for DL(NO), DL(CO), Dm(CO), and V(c) over a 2-month period.

Main Methods:

  • Twelve healthy subjects underwent repeated single-breath diffusing capacity tests over 2 months (eight sessions).
  • Subjects inhaled nitric oxide (NO) and a standard diffusion mixture during each test.

Related Experiment Videos

  • DL(NO), DL(CO), Dm(CO), and pulmonary capillary blood volume (V(c)) were measured and analyzed for variability.

    • Main Results:

    • DL(NO), DL(CO), Dm(CO), and V(c) showed no significant alterations over the 2-month study period (P>0.05).
    • Reproducibility values were established: 20 mL min(-1)mmHg(-1) for DL(NO), 5 mL min(-1)mmHg(-1) for DL(CO), 8 mL min(-1)mmHg(-1) for Dm(CO), and 19 mL for V(c).

    Conclusions:

    • DL(NO), DL(CO), Dm(CO), and V(c) are stable in healthy individuals over a 2-month period.
    • Established reproducibility values serve as critical thresholds to distinguish true physiological changes from natural biological or technical variation in DL(NO) measurements.