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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

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
NREM sleep comprises four progressive stages that seamlessly merge:
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Narcolepsy01:07

Narcolepsy

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Narcolepsy is a chronic sleep disorder characterized by pervasive, uncontrolled sleepiness and other sleep disturbances. One of its hallmark symptoms is an abrupt transition to REM sleep upon falling asleep, which causes symptoms typically associated with this phase to occur unexpectedly during wakefulness. These include the following symptoms, which typically last from a minute or two to half an hour.
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REM Sleep Behavior Disorder01:15

REM Sleep Behavior Disorder

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REM Sleep Behavior Disorder (RBD) is a sleep disorder characterized by the absence of muscle paralysis that normally occurs during the REM phase of sleep. This absence allows individuals to physically act out their dreams, which are often vivid and disturbing. Common behaviors exhibited during episodes include kicking, punching, and yelling. These actions can be dangerous, potentially leading to injuries for the person with RBD or their bed partner.
RBD is significantly associated with...
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Sleepwalking and Sleep Talking01:17

Sleepwalking and Sleep Talking

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Somnambulism, commonly known as sleepwalking, involves individuals engaging in activities ranging from simple walking to more complex behaviors such as driving. Sleepwalking typically occurs during the slow-wave sleep stages 3 and 4 early in the night when the person is not dreaming, contradicting the myth that sleepwalkers are acting out their dreams.
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Other Pulmonary Disorders01:17

Other Pulmonary Disorders

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Respiratory disorders encompass a range of conditions with varying levels of severity. Asthma, marked by chronic airway inflammation and hypersensitivity, is one such condition. It can lead to airway obstruction due to factors like bronchial spasms, mucosal edema, increased mucus secretion, or epithelial damage. Asthma triggers are diverse, ranging from allergens to emotional upset, and treatment focuses on both immediate relief through bronchodilators and long-term inflammation suppression.
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Related Experiment Video

Updated: Feb 25, 2026

Drug-Induced Sleep Endoscopy DISE with Target Controlled Infusion TCI and Bispectral Analysis in Obstructive Sleep Apnea
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[Complex sleep apnea syndrome].

A D Palman1

  • 1Sechenov First Moscow State Medical University, Moscow, Russia.

Zhurnal Nevrologii I Psikhiatrii Imeni S.S. Korsakova
|August 5, 2017
PubMed
Summary
This summary is machine-generated.

Complex sleep apnea syndrome (Comp-SAS) arises in patients with obstructive sleep apnea (OSAS) treated with CPAP. Most cases resolve within months, but treatment for asymptomatic patients remains unclear.

Keywords:
CPAPadaptive servo-ventilationcentral sleep apneacomplex sleep apneaobstructive sleep apnea

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Area of Science:

  • Sleep Medicine
  • Respiratory Physiology
  • Cardiovascular Pathology

Background:

  • Complex sleep apnea syndrome (Comp-SAS) is defined as central sleep apnea emerging during treatment for obstructive sleep apnea syndrome (OSAS) with continuous positive airway pressure (CPAP).
  • The exact mechanisms are unclear but may involve increased carbon dioxide elimination and improved ventilation due to CPAP.
  • Comp-SAS affects 5-20% of OSAS patients on CPAP, with higher likelihood in older males with severe OSAS and cardiovascular comorbidities.

Purpose of the Study:

  • To review the characteristics, prevalence, and management of Comp-SAS.
  • To discuss potential treatment options and the necessity of treating asymptomatic Comp-SAS patients.

Main Methods:

  • Literature review of studies on Comp-SAS.
  • Analysis of prevalence data and risk factors.
  • Discussion of current and novel treatment strategies.

Main Results:

  • Central apnea events in Comp-SAS are often transient, resolving within 1-2 months of consistent CPAP use.
  • Older males with severe OSAS and conditions like heart failure are more prone to Comp-SAS.
  • Adaptive servo-ventilation and BiPAP-ST are alternatives for CPAP non-responders, except in systolic heart failure.

Conclusions:

  • Most Comp-SAS cases resolve with continued CPAP therapy.
  • The need for treatment in asymptomatic Comp-SAS patients requires further investigation.
  • Careful consideration of comorbidities is essential when selecting treatment for Comp-SAS.