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Physiologic diagnosis and function in asthma

R M Cherniack1

  • 1Division of Pulmonary Science and Critical Care Medicine, University of Colorado School of Medicine, Denver, USA.

Clinics in Chest Medicine
|December 1, 1995
PubMed
Summary
This summary is machine-generated.

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Asthma involves reversible airway narrowing due to triggers. Severe asthma exacerbations show decreased oxygen and increased carbon dioxide, indicating respiratory muscle fatigue.

Area of Science:

  • Pulmonology
  • Respiratory Physiology

Background:

  • Asthma is characterized by airway hyperresponsiveness and reversible narrowing.
  • Symptoms like chest tightness and cough result from airway inflammation and obstruction.

Purpose of the Study:

  • To describe the physiological alterations in asthma exacerbations.
  • To highlight the subtle early changes and indicators of severe obstruction.

Main Methods:

  • The abstract discusses physiological changes observed in asthma exacerbations.
  • It references concepts like airway resistance, FEV1, and lung volumes.

Main Results:

  • Early exacerbations may have subtle physiologic changes, with decreased PaO2 and increased P(A-a)O2.
  • Severe exacerbations show increased lung volumes, altered static volume-pressure curves, and reversible airway obstruction with treatment.

Related Experiment Videos

  • A decreasing PaO2 and increasing PaCO2 indicate severe obstruction and impending respiratory failure.

    • Conclusions:

    • Asthma exacerbations involve complex physiological changes affecting gas exchange and lung mechanics.
    • Monitoring gas exchange (PaO2, PaCO2) and lung function (FEV1) is crucial for assessing asthma severity and guiding therapy.