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Related Experiment Videos

Repeatability of lung function tests during methacholine challenge in wheezy infants.

C Delacourt1, M R Benoist, S Waernessyckle

  • 1Laboratoire d'Explorations Fonctionnelles Respiratoires, Hôpital des Enfants Malades, Paris, France.

Thorax
|April 8, 1999
PubMed
Summary

Repeatability of lung function tests in wheezy infants was assessed. Methacholine challenge tests using VmaxFRC or Ptco2 showed similar repeatability, with significant changes requiring over 3.7 doubling doses.

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Area of Science:

  • Pediatric Pulmonology
  • Respiratory Physiology

Background:

  • Recurrent wheezing in infants presents diagnostic challenges.
  • Assessing airway hyperresponsiveness is crucial for managing pediatric respiratory conditions.

Purpose of the Study:

  • To evaluate the repeatability of lung function tests and methacholine inhalation challenges in recurrently wheezy infants.
  • To compare the repeatability of using maximal flow at functional residual capacity (VmaxFRC) versus transcutaneous oxygen tension (Ptco2) as outcome measures.

Main Methods:

  • Eighty-one symptom-free, wheezy infants underwent paired methacholine challenge tests one month apart.
  • Measurements included VmaxFRC and Ptco2, with provocative doses (PD15 Ptco2, PD30 VmaxFRC) determined.
  • The rapid thoracic compression technique was employed.

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Main Results:

  • Baseline VmaxFRC values exhibited significant variability in wheezy infants.
  • Repeatability for PD30 VmaxFRC and PD15 Ptco2 demonstrated similar precision.
  • A change exceeding 2.7 doubling doses in VmaxFRC or similar for Ptco2 was observed within a single determination's 95% range.

Conclusions:

  • Baseline VmaxFRC is highly variable in wheezy infants.
  • Both VmaxFRC and Ptco2 offer comparable repeatability for methacholine challenges.
  • A change of more than 3.7 doubling doses of methacholine is considered clinically significant.