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Related Experiment Videos

The association between baseline lung function and bronchial responsiveness to methacholine

G Wassmer1, R A Jörres, J Heinrich

  • 1GSF, Institut für Epidemiologie, Neuherberg, Germany. gernot.wassmer@medizin.uni-koeln.de

European Journal of Medical Research
|February 21, 1997
PubMed
Summary

Gender differences in bronchial hyperresponsiveness (BHR) disappear when accounting for lung function and height. These factors, not intrinsic differences, likely explain prevalence variations in BHR between males and females.

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Area of Science:

  • Pulmonology
  • Respiratory Medicine
  • Epidemiology

Background:

  • Females reportedly exhibit higher bronchial hyperresponsiveness (BHR) frequencies than males.
  • Previous studies suggest this gender disparity in BHR diminishes when baseline lung function, specifically forced expiratory volume in one second (FEV1), is considered.
  • The influence of different BHR definitions on observed gender prevalence rates requires further investigation.

Purpose of the Study:

  • To analyze how the distribution of BHR in males and females is affected by various definitions of BHR.
  • To determine if BHR prevalence rates, under different definitions, correlate similarly with baseline subject characteristics and lung function.
  • To investigate the underlying factors contributing to gender differences in BHR prevalence.

Main Methods:

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  • Analysis of data from the European Community Respiratory Health Survey (ECRHS) in Erfurt, Germany (n=931, ages 20-65).
  • Logistic regression models incorporating age, height, gender, smoking, baseline FEV1, forced vital capacity (FVC), and FEV1% FVC.
  • Evaluation of different BHR definitions, including provocative dose causing a 20% fall in FEV1 and dose-response slopes (DRS).

Main Results:

  • BHR was more prevalent in females (27.6%) than males (13.2%) when defined as a 20% fall in FEV1.
  • Similar gender differences were observed with other BHR definitions (10% fall in FEV1, DRS).
  • The gender difference in BHR prevalence vanished when height and FEV1 (or FEV1% FVC) were included in the regression models.

Conclusions:

  • Observed gender differences in BHR prevalence may be artifacts of methacholine dosage per lung size and airway geometry, not intrinsic biological differences.
  • The dose-response slope (DRS) demonstrated superior resolution for analyzing bronchial responsiveness in epidemiological surveys.
  • Adjusting for lung function parameters like FEV1 and height is crucial for accurate interpretation of gender-specific BHR prevalence.