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Related Experiment Videos

Variability of pulmonary function tests in stable corticosteroid dependent asthma patients.

W B Klaustermeyer1, K S Garb, S M Santiago

  • 1Allergy and Immunology Section, Wadsworth VA Medical Center, West Los Angeles, California 90073.

Allergy Proceedings : the Official Journal of Regional and State Allergy Societies
|July 1, 1991
PubMed
Summary

Establishing a reliable baseline over several months is crucial for accurately assessing steroid-sparing agents in asthma patients due to significant weekly variability in lung function. Shorter baseline periods are inadequate.

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Area of Science:

  • Pulmonology
  • Clinical Pharmacology

Background:

  • Corticosteroid dependence in asthma necessitates exploring alternative treatments like steroid-sparing agents.
  • Accurate assessment of therapeutic efficacy requires reliable patient baseline data.

Purpose of the Study:

  • To establish a baseline for future clinical trials of corticosteroid-sparing agents in corticosteroid-dependent asthmatics.
  • To evaluate the adequacy of short-term (1-2 months) baseline data collection in this patient population.

Main Methods:

  • Longitudinal study of 24 corticosteroid-dependent asthmatic patients over 10 months.
  • Collected data included clinical symptoms, corticosteroid dose, peak expiratory flow (PF), forced expiratory volume in 1 second (FEV1), and forced vital capacity (FVC).
  • Analyzed correlations between lung function parameters, symptom severity, time, and corticosteroid dosage.

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Main Results:

  • Significant weekly variability observed in PF and FEV1 measurements.
  • Over nearly a year, 54% of patients showed no significant change in PF, while 29% worsened and 17% improved.
  • Neither patient-reported symptom severity nor corticosteroid dosage correlated with objective spirometric measurements.

Conclusions:

  • A minimum baseline period of several months is necessary to account for weekly variability and accurately assess treatment effects in corticosteroid-dependent asthmatics.
  • Current 1-2 month baseline assessments are insufficient for this population.
  • Objective spirometry is essential, as subjective symptom assessment and steroid dose do not reliably correlate with lung function.