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Factors affecting respiratory system stability.

G S Longobardo1, N S Cherniack, B Gothe

  • 1Case Western Reserve University, Cleveland, Ohio 44106.

Annals of Biomedical Engineering
|January 1, 1989
PubMed
Summary
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Periodic breathing, characterized by recurrent central apneas during sleep, is linked to respiratory control system instability. Increased circulation time, controller gain, hypoxia, and faster PCO2 rise at sleep onset exacerbate periodic breathing.

Area of Science:

  • Physiology
  • Computational Biology
  • Sleep Medicine

Background:

  • Periodic breathing, marked by recurrent central apneas, is common during sleep.
  • It can stem from instability within the respiratory control system.
  • Understanding factors influencing periodic breathing is crucial for sleep disorder research.

Purpose of the Study:

  • To systematically investigate how respiratory disturbances and system parameters affect periodic breathing during sleep using a mathematical model.
  • To explore the boundaries of stable breathing under various conditions.

Main Methods:

  • A mathematical model of the respiratory control system was developed, including O2 and CO2 stores, and peripheral and central controllers.
  • The model simulated episodes of hyperventilation or asphyxia to disturb the system.

Related Experiment Videos

  • Parameters such as circulation time, metabolic rate, and controller gain were varied.

    • Main Results:

    • Increased circulation time and controller gain led to more central apneas.
    • Hypoxia and reduced metabolic rate (associated with sleep) also increased apnea frequency.
    • A faster rise in partial pressure of carbon dioxide (PCO2) at sleep onset heightened the likelihood of recurrent apneas.
    • Greater disturbance intensity correlated with more apneas.

    Conclusions:

    • Mathematical modeling provides insights into the complex dynamics of periodic breathing.
    • Circulation time, controller gain, hypoxia, metabolic rate, and PCO2 dynamics are key determinants of periodic breathing during sleep.
    • These findings contribute to understanding the physiological basis of sleep-related breathing disorders.