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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.
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Brain diffusion changes in obstructive sleep apnoea syndrome.

Muhammed Emin Akkoyunlu1, Levent Kart, Rukiye Kılıçarslan

  • 1Department of Pulmonology, Bezmialem Vakif University, Fatih, Turkey.

Respiration; International Review of Thoracic Diseases
|June 12, 2013
PubMed
Summary

Obstructive sleep apnoea syndrome (OSAS) causes brain changes. Diffusion-weighted imaging (DWI) revealed increased apparent diffusion coefficients (ADCs) in the hippocampus, amygdala, and putamen, indicating hypoxia.

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Area of Science:

  • Neurology
  • Radiology
  • Sleep Medicine

Background:

  • Obstructive sleep apnoea syndrome (OSAS) involves repeated breathing pauses during sleep.
  • Hypoxia in specific brain regions associated with OSAS can lead to neurocognitive deficits.
  • Diffusion-weighted imaging (DWI) offers a non-invasive method to detect OSAS-related brain alterations.

Purpose of the Study:

  • To utilize DWI to investigate brain changes resulting from hypoxia in patients with OSAS.
  • To compare apparent diffusion coefficients (ADCs) in various brain regions between OSAS patients and healthy controls.

Main Methods:

  • Eighty-eight patients underwent polysomnography to classify OSAS severity (non-OSAS, mild-moderate, severe).
  • DWI was employed to assess 14 brain areas, calculating apparent diffusion coefficients (ADCs).
  • ADC values were analyzed to identify differences between non-OSAS and OSAS groups.

Main Results:

  • ADC values were significantly elevated in the hippocampus, amygdala, and putamen of OSAS patients.
  • Severe OSAS patients showed increased putamen ADCs; moderate/severe OSAS patients had increased hippocampus ADCs; moderate OSAS patients had increased amygdala ADCs.
  • A negative correlation was observed between lowest oxygen saturation and ADC values in the hippocampus and amygdala.

Conclusions:

  • Elevated ADC levels in the hippocampus, amygdala, and putamen suggest hypoxia-induced vasogenic edema in these brain regions in OSAS patients.
  • DWI can identify specific brain regions affected by hypoxia in OSAS.