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Related Concept Videos

Sleep Apnea01:21

Sleep Apnea

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Sleep apnea is a condition where breathing stops intermittently during sleep, often leading to significant health issues. Each episode can last from 10 to 20 seconds or more and is frequently accompanied by a brief arousal from sleep. This disturbance, largely unnoticed by the individual, can lead to severe daytime fatigue. Commonly, individuals seek help after being informed by their partners about loud snoring and noticeable breathing pauses during sleep.
The condition is more prevalent among...
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The human body's intricate network of arteries ensures that every organ system receives the necessary oxygen and nutrients for optimal function. The arterial network in the head and neck region is particularly complex, providing vital blood flow to the brain, eyes, and other critical structures. Prominent arteries in this region include the internal carotid arteries and the vertebral arteries.
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A Model to Simulate Clinically Relevant Hypoxia in Humans
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How does obstructive sleep apnea alter cerebral hemodynamics?

Clara Gregori-Pla1, Peyman Zirak1, Gianluca Cotta1

  • 1ICFO-Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Av. Carl Friedrich Gauss, 3, Castelldefels (Barcelona), 08860, Spain.

Sleep
|June 19, 2023
PubMed
Summary
This summary is machine-generated.

Obstructive sleep apnea events cause significant, cyclical changes in cerebral blood flow and oxygenation. Event duration and type (apnea vs. hypopnea) strongly influence these cerebral hemodynamic responses.

Keywords:
cerebral hemodynamicsdiffuse correlation spectroscopynear-infrared spectroscopyobstructive sleep apneasleep disorder

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Area of Science:

  • Neurology
  • Sleep Medicine
  • Cardiovascular Physiology

Background:

  • Obstructive sleep apnea (OSA) is a condition characterized by repeated episodes of airway obstruction during sleep.
  • Understanding the impact of OSA on cerebral hemodynamics is crucial for assessing its overall severity.
  • Conventional polysomnography may not fully capture the extent of neurological compromise in OSA patients.

Purpose of the Study:

  • To characterize the cerebral hemodynamic response to obstructive sleep apnea/hypopnea events.
  • To evaluate the association between these hemodynamic changes and polysomnographic parameters.
  • To provide complementary information for understanding OSA severity.

Main Methods:

  • Studied 16 severe OSA patients during overnight polysomnography.
  • Utilized bedside diffuse correlation spectroscopy (DCS) and near-infrared diffuse correlation spectroscopy (NIRS-DOS) to monitor microvascular cerebral hemodynamics in the frontal cortex.
  • Analyzed changes in cerebral blood flow (CBF), total hemoglobin concentration (THC), and cerebral blood oxygen saturation (StO2).

Main Results:

  • Observed a biphasic response in CBF, THC, and StO2 during 3283 obstructive apnea/hypopnea events.
  • StO2 changes mirrored SpO2 dynamics, while CBF and THC changes were out of phase.
  • Longer events correlated with greater CBF changes, faster responses, and slower recoveries; apneas caused more extreme responses than hypopneas.

Conclusions:

  • Obstructive apneas/hypopneas induce significant, periodic alterations in cerebral hemodynamics, including intermittent hyper/hypoperfusion and hypoxia.
  • Event duration is a key factor determining the magnitude of the cerebral hemodynamic response.
  • Cerebral hemodynamic responses are more pronounced during apneas compared to hypopneas.