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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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Sleep-Wake Cycles01:24

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Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
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Hyperpnea and Hyperventilation01:25

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Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
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Alterations in Respiration II01:30

Alterations in Respiration II

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There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
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Cushing Syndrome II: Pathophysiology01:19

Cushing Syndrome II: Pathophysiology

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Cortisol production is normally governed by the hypothalamic–pituitary–adrenal (HPA) axis, which maintains hormonal balance through tightly regulated feedback mechanisms. Disruption of this regulatory system is central to the development of Cushing syndrome, whether the excess cortisol originates from external medications or internal pathology. Persistent cortisol elevation alters metabolism, immune function, and endocrine signaling, producing the characteristic clinical features...
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Metabolic States of the Body: The Postabsorptive State01:18

Metabolic States of the Body: The Postabsorptive State

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The postabsorptive state usually starts about four hours after a meal and lasts until the next meal is eaten. During this time, the digestive system stops absorbing nutrients, and the body uses stored energy reserves to maintain stable blood glucose levels.
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Updated: Apr 30, 2026

Drug-Induced Sleep Endoscopy DISE with Target Controlled Infusion TCI and Bispectral Analysis in Obstructive Sleep Apnea
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Insular cortex metabolite changes in obstructive sleep apnea.

Santosh K Yadav1, Rajesh Kumar2, Paul M Macey3

  • 1Department of Anesthesiology, David Geffen School of Medicine at UCLA.

Sleep
|May 3, 2014
PubMed
Summary
This summary is machine-generated.

Obstructive sleep apnea (OSA) is linked to brain changes in the insula, showing neuronal damage and glial activation. These findings suggest inflammation and support targeted neuroprotection strategies for OSA patients.

Keywords:
N-acetylaspartateanxietyautonomiccholinecreatinedepressionmagnetic resonance spectroscopymyo-inositol

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A Model to Simulate Clinically Relevant Hypoxia in Humans
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Area of Science:

  • Neuroimaging
  • Neurology
  • Sleep Medicine

Background:

  • Obstructive sleep apnea (OSA) is associated with autonomic and neuropsychological deficits.
  • These deficits may stem from damage to insular brain regions responsible for these functions.

Purpose of the Study:

  • To assess glial and neuronal status in the anterior insula of adults with OSA compared to controls.
  • To investigate anterior insular metabolites using proton magnetic resonance spectroscopy (PMRS).
  • To gain insights into neuroprotection and reducing injury consequences in OSA.

Main Methods:

  • Cross-sectional study conducted at a university-based medical center.
  • Proton magnetic resonance spectroscopy (PMRS) performed on bilateral anterior insulae using a 3.0-Tesla MRI scanner.
  • Measured metabolite ratios (NAA/Cr, Cho/Cr, MI/Cr, MI/NAA) and assessed sleepiness, quality, and neuropsychological status.

Main Results:

  • Patients with OSA exhibited significantly reduced bilateral NAA/Cr ratios, indicating neuronal damage.
  • Increased left-sided MI/Cr and MI/NAA ratios in OSA suggest glial activation.
  • Correlations found between insular metabolite ratios and OSA severity, sleepiness, and neuropsychological scores.

Conclusions:

  • Adults with OSA demonstrate neuronal damage and glial activation in the anterior insula.
  • This glial activation may indicate increased inflammatory action, potentially leading to further neuronal injury.
  • Findings suggest the need for distinct neuroprotective strategies targeting both glial and neuronal components in OSA.