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Expiratory timing in obstructive sleep apnoeas.

F Cibella1, O Marrone, S Sanci

  • 1Istituto di Fisiopatologia Respiratoria del C.N.R. Palermo, Italy.

The European Respiratory Journal
|March 1, 1990
PubMed
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Investigating obstructive sleep apnea (OSA), this study analyzed expiratory time (TE) during NREM sleep. Findings reveal distinct modulation of TE components, influenced by both mechanical and chemical factors in the apnea-ventilation cycle.

Area of Science:

  • Respiratory Physiology
  • Sleep Medicine
  • Neurobiology

Background:

  • Obstructive sleep apnea (OSA) is characterized by recurrent upper airway collapse during sleep.
  • Understanding the control of breathing during OSA events is crucial for managing the condition.
  • Expiratory time (TE) is a key parameter reflecting respiratory control mechanisms.

Purpose of the Study:

  • To investigate the behavior of expiratory time (TE) components during the obstructive apnea-ventilation cycle in patients with OSA.
  • To differentiate the roles of mechanical and chemical drives in modulating TE during sleep apnea.

Main Methods:

  • Diaphragmatic electromyogram (EMGdi) was recorded during NREM sleep in 4 OSA patients.
  • Expiratory time (TE) was analyzed by separating its components: time of post-inspiratory inspiratory activity (TPIIA) and time of expiratory phase 2 (TE2).

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Main Results:

  • TPIIA duration was short and stable during apneas but more variable and longer between apneas, correlating with inspiratory volumes.
  • TE2 exhibited continuous modulation, increasing pre-apnea, decreasing during apnea, and rising post-apnea, linked to chemical drive oscillations.
  • These findings indicate differential regulation of TE components during the apnea-ventilation cycle.

Conclusions:

  • Expiratory time (TE) regulation in OSA involves distinct modulation of its components (TPIIA and TE2).
  • Pulmonary stretch receptor feedback likely influences TPIIA, suggesting mechanical control.
  • Oscillations in chemical drive appear to modulate TE2, indicating chemical control.