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Determinants of ventilatory instability and variability.

M C Khoo1

  • 1Biomedical Engineering Department, University of Southern California, Los Angeles, CA 90089, USA. khoo@bmsrs.usc.edu

Respiration Physiology
|September 1, 2000
PubMed
Summary
This summary is machine-generated.

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This study explores how respiratory control system instability causes breathing pattern variations. Elevated controller gain and delays can lead to periodic breathing, a key factor in respiratory variability.

Area of Science:

  • Physiology
  • Respiratory Control
  • Control Systems Theory

Background:

  • Ventilatory pattern variability is a complex phenomenon.
  • Understanding the mechanisms of respiratory variability is crucial for diagnosing and treating respiratory disorders.

Purpose of the Study:

  • To review the major mechanisms underlying ventilatory pattern variability.
  • To discuss the role of controller gain, delays, and physiological fluctuations in respiratory instability.
  • To explore nonlinear dynamics in respiratory control.

Main Methods:

  • Review of existing literature on respiratory control mechanisms.
  • Discussion of quantitative methods for assessing ventilatory stability, including 'loop gain' estimation.
  • Analysis of factors influencing periodic and irregular breathing patterns.

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Main Results:

  • Elevated controller gain and feedback loop delays can cause periodic breathing.
  • Physiological fluctuations (e.g., sleep-wake state, cardiac output) can induce periodic breathing even in stable systems.
  • Nonlinear dynamics and stochastic disturbances can generate self-sustained, irregular ventilatory fluctuations.

Conclusions:

  • Ventilatory pattern variability arises from multiple interacting mechanisms.
  • Controller gain, feedback delays, physiological fluctuations, and nonlinear dynamics are key contributors to respiratory instability.
  • Quantitative assessment of 'loop gain' is important for understanding ventilatory stability.