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Small airway function in obese individuals with self-reported asthma.

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Obese individuals with self-reported asthma but normal spirometry show distinct clinical features and enhanced small airway dysfunction. These findings suggest subtle airway changes may indicate early asthma in obesity, even with normal lung function tests.

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Area of Science:

  • Pulmonology
  • Obesity Medicine
  • Respiratory Physiology

Background:

  • Asthma diagnosis in obese individuals is challenging due to normal spirometry results.
  • Obesity is linked to various comorbidities that may affect respiratory health.
  • Small airway dysfunction can be an early indicator of respiratory disease.

Purpose of the Study:

  • To investigate clinical characteristics, metabolic comorbidities, and small airway dysfunction in obese subjects with self-reported asthma and normal spirometry.
  • To compare these findings with obese subjects without asthma and those with asthma and airflow obstruction.
  • To identify potential early markers of asthma in obese individuals.

Main Methods:

  • Spirometry, plethysmography, and oscillometry were performed on 357 obese subjects across three groups: no asthma, self-reported asthma with normal spirometry, and asthma with obstruction.
  • Oscillometry was repeated during voluntary inflation to predicted functional residual capacity (FRC) to assess obesity-related lung volume effects.
  • Data were analyzed pre- and post-bronchodilator to evaluate airway changes.

Main Results:

  • Subjects with self-reported asthma (normal or obstructed spirometry) reported more cough and wheeze and had higher rates of metabolic comorbidities than the no-asthma group.
  • Elevated resistance at 5-20 Hz (R5-20) in oscillometry indicated small airway dysfunction in both no-asthma and normal-spirometry asthma groups, more so than in healthy obese individuals.
  • Bronchodilator response and voluntary inflation to FRC normalized R5-20 in the normal-spirometry asthma group, suggesting reversible dysfunction, unlike the obstructed group.

Conclusions:

  • Obese subjects with self-reported asthma and normal spirometry exhibit enhanced small airway dysfunction compared to healthy obese individuals.
  • These subtle airway abnormalities may serve as an early marker for asthma in obese populations, even when spirometry is normal.
  • Increased metabolic comorbidities in this group may contribute to the observed airway dysfunction, highlighting the complex interplay between obesity, metabolism, and respiratory health.