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Related Experiment Videos

Posture and nocturnal asthma.

K F Whyte1, N J Douglas

  • 1Department of Respiratory Medicine, City Hospital, Edinburgh.

Thorax
|July 1, 1989
PubMed
Summary
This summary is machine-generated.

Lying down (supine posture) does not cause prolonged bronchoconstriction in patients with nocturnal asthma. This study suggests that posture is not a major factor in overnight asthma symptoms.

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Area of Science:

  • Pulmonology
  • Respiratory Medicine
  • Sleep Medicine

Background:

  • Nocturnal asthma is characterized by worsening symptoms during sleep.
  • The supine posture is often suspected as a trigger for overnight bronchoconstriction.

Purpose of the Study:

  • To determine if the supine posture induces sustained bronchoconstriction.
  • To assess the contribution of posture to the development of nocturnal asthma.

Main Methods:

  • Nine patients with nocturnal asthma underwent a randomized crossover study.
  • Pulmonary function tests, including peak expiratory flow (PEF), forced expiratory volume in one second (FEV1), and forced vital capacity (FVC), were measured after 4 hours in supine and upright postures.

Main Results:

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  • No significant differences in PEF, FEV1, or FVC were observed between the supine and upright postures at the end of the 4-hour period.
  • No significant changes in pulmonary function developed subsequently in either posture.

Conclusions:

  • The supine posture does not appear to cause prolonged bronchoconstriction in individuals with nocturnal asthma.
  • Posture is unlikely to be a significant contributor to the overnight bronchoconstriction observed in nocturnal asthma.