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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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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.
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes...
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Sleep-Wake Cycles01:24

Sleep-Wake Cycles

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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
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Stages of Sleep01:22

Stages of Sleep

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Sleep progresses through distinct stages, each characterized by specific brain wave patterns and physiological responses ranging from wakefulness to stages of non-rapid eye movement, known as non-REM, to rapid eye movement, referred to as REM. Understanding these stages helps in recognizing how sleep supports various bodily and cognitive functions.
Before sleep begins, in wakefulness, the brain exhibits primarily beta waves, which are high in frequency and low in amplitude, indicating alertness...
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Respiratory Volumes and Capacities I01:26

Respiratory Volumes and Capacities I

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Assessing the respiratory rate and rhythm for a complete minute is crucial for evaluating the breathing pattern. Even a minor increase in the patient's average respiratory rate, by as little as three to five breaths per minute, is an early and vital indicator of respiratory distress. Patients with a respiratory rate exceeding twenty-four breaths per minute require close monitoring to determine the physiological alterations. This careful observation is essential for prompt recognition and...
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Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

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Respiratory Depth
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
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Drug-Induced Sleep Endoscopy DISE with Target Controlled Infusion TCI and Bispectral Analysis in Obstructive Sleep Apnea
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Examining Sleep-Disordered Breathing Events Using Latent Profile Analysis.

Marina Weinberger1, Anwar E Ahmed2, Ahmed Almuttari3

  • 1School of Medicine, Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA.

Behavioural Neurology
|April 14, 2025
PubMed
Summary
This summary is machine-generated.

This study identified four distinct subtypes of sleep-disordered breathing (SDB) using polysomnography data. Recognizing these SDB subtypes may improve patient diagnosis and treatment strategies.

Keywords:
AHIREM/AHINREM ratioobstructive sleep apneapolysomnographysleep

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Area of Science:

  • Sleep Medicine
  • Respiratory Physiology
  • Clinical Research

Background:

  • The clinical significance of the apnea-hypopnea index (AHI) ratio between REM and NREM sleep (AHIREM/AHINREM) in sleep-disordered breathing (SDB) remains debated.
  • Understanding SDB heterogeneity is crucial for personalized treatment approaches.

Purpose of the Study:

  • To investigate REM and NREM sleep behavior heterogeneity in SDB.
  • To identify distinct SDB subtypes and their demographic and clinical characteristics.

Main Methods:

  • Latent profile analysis of polysomnography data from 3626 adult patients.
  • Categorization based on AHIREM, AHINREM, and the AHIREM/AHINREM ratio.
  • Multinomial logistic regression to assess SDB profile predictors.

Main Results:

  • Four SDB subtypes were identified: Class I (normal REM AHI), Class II (REM-dominant OSA), Class III (moderate NREM AHI), and Class IV (severe NREM AHI).
  • Class IV was associated with older age, higher BMI, hypertension, reduced sleep quality, and increased daytime sleepiness.
  • Distinct demographic and clinical features were observed across the identified SDB subtypes.

Conclusions:

  • The study successfully characterized distinct SDB subtypes based on REM/NREM AHI patterns.
  • These identified subtypes may offer clinical utility in refining SDB diagnosis and predicting treatment response in adult patients.
  • Further research into subtype-specific management strategies is warranted.