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Conducting Respiratory Oscillometry in an Outpatient Setting
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Physiological differences and similarities in asthma and COPD--based on respiratory function testing.

Michiaki Mishima1

  • 1Department of Respiratory Medicine, Postgraduate School of Medicine, Kyoto University, Kyoto, Japan. mishima@kuhp.kyoto-u.ac.jp

Allergology International : Official Journal of the Japanese Society of Allergology
|July 25, 2009
PubMed
Summary

Asthma and COPD share some respiratory function similarities but differ in airflow reversibility and airway resistance patterns. Differentiating these conditions aids in accurate diagnosis and treatment planning for better patient outcomes.

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Area of Science:

  • Pulmonary Medicine
  • Respiratory Physiology
  • Diagnostic Tools

Background:

  • Asthma and Chronic Obstructive Pulmonary Disease (COPD) are distinct respiratory conditions with overlapping and unique physiological characteristics.
  • Accurate differentiation is crucial for effective management and treatment strategies.
  • Respiratory function testing provides valuable insights into the pathophysiology of both diseases.

Purpose of the Study:

  • To delineate the physiological differences and similarities between asthma and COPD using various respiratory function tests.
  • To evaluate the diagnostic and prognostic utility of specific tests in distinguishing between asthma and COPD.
  • To highlight key parameters for monitoring disease progression and treatment response.

Main Methods:

  • Analysis of airflow reversibility and flow-volume curves.
  • Assessment of inspiratory capacity (IC), peak expiratory flow (PEF), and airway responsiveness.
  • Utilization of the Impulse Oscillation System (IOS) and Diffusing capacity of the lungs for carbon monoxide (D(LCO)).
  • Evaluation of alveolar-arterial oxygen difference (A-aDO2) and arterial blood gases (PaCO2, PaO2).

Main Results:

  • Airflow reversibility is typically key for asthma diagnosis but can be poor in long-standing cases; it predicts treatment response in COPD.
  • Flow-volume curves and inspiratory capacity (IC) offer insights into disease severity and air trapping.
  • Impulse Oscillation System (IOS) differentiates central (asthma) vs. peripheral (COPD) airway resistance, though overlap exists.
  • D(LCO) is reduced in COPD due to emphysema but not typically in asthma.
  • Widened A-aDO2 and hypoventilation indicate severe disease requiring urgent intervention.

Conclusions:

  • Respiratory function tests provide a spectrum of findings that aid in differentiating asthma and COPD.
  • Specific tests like airflow reversibility, IOS, and D(LCO) have distinct roles in diagnosing and monitoring each condition.
  • Understanding these physiological differences is vital for tailored therapeutic approaches and managing severe exacerbations.