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Symptoms and pulmonary function in asthma

S M Alcock1, M Mamun, R J Prescott

  • 1Department of Medicine, Darlington Memorial Hospital NHS Trust, U.K.

Respiratory Medicine
|December 16, 1998
PubMed
Summary
This summary is machine-generated.

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Asthma symptom severity is closely linked to lung function, particularly best lung function. Maintaining actual/best lung function above 85% is crucial for managing asthma symptoms effectively.

Area of Science:

  • Pulmonary Medicine
  • Respiratory Physiology
  • Asthma Research

Background:

  • The relationship between asthma symptoms and pulmonary function is critical for effective asthma management and guideline adherence.
  • Understanding this link helps in assessing disease control and patient adherence to therapy.

Purpose of the Study:

  • To investigate the associations between reported asthma symptoms, pulmonary function metrics, and bronchodilator therapy in a large cohort of asthmatic patients.
  • To determine the predictive value of different pulmonary function measures (best vs. actual/best) for symptom burden.

Main Methods:

  • A cross-sectional study involving 824 asthma patients.
  • Data collected included reported symptoms (daytime and nocturnal), bronchodilator usage, and pulmonary function tests (FEV1, PEF).

Related Experiment Videos

  • Statistical analyses explored univariate relationships and quintile-based comparisons of symptoms against lung function.

    • Main Results:

    • Symptom prevalence decreased as best lung function increased.
    • A significant increase in symptoms was observed in the highest quintile of actual/best FEV1 compared to mid-quintiles.
    • A U-shaped relationship trended between actual/best PEF and symptom prevalence, suggesting a complex interplay.

    Conclusions:

    • Best lung function is a reliable indicator of the expected symptom load in asthma.
    • Actual/best lung function below 85% correlates with a higher prevalence of symptoms.
    • While 85-90% actual/best lung function is a useful benchmark for asymptomatic patients, it may not exclude all symptomatic individuals.