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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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Disorders of the Autonomic Nervous System01:18

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The autonomic nervous system (ANS) is an intricate network of nerves that controls functions such as the regulation of heart rate, digestion, and blood pressure regulation. When this system malfunctions, it can lead to various disorders that affect multiple bodily functions. One common feature of many autonomic disorders is the involvement of smooth blood vessels, which play a crucial role in regulating blood flow throughout the body.
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Acute Respiratory Failure-III01:30

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Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without...
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Acute Respiratory Failure-II01:21

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Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
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Pathophysiology of Heart Failure01:17

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Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
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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
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Relationship Between Obstructive Sleep Apnea and Autonomic Failure.

Renata Maria de Carvalho Cremaschi1,2, Fernando Morgadinho Santos Coelho1,2, Sasha Moran1

  • 1Mass General Brigham, Department of Neurology, Boston, Massachusetts, USA.

Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society
|October 21, 2025
PubMed
Summary
This summary is machine-generated.

Daytime autonomic dysfunction and small fiber neuropathy are common in obstructive sleep apnea (OSA). The severity of autonomic failure correlates with OSA severity, potentially increasing cardiovascular risks.

Keywords:
Autonomic failureAutonomic testingObstructive sleep apneaParasympatheticSympathetic

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Area of Science:

  • Neurology
  • Sleep Medicine
  • Cardiology

Background:

  • Obstructive sleep apnea (OSA) is linked to various health issues.
  • Autonomic nervous system dysfunction is increasingly recognized in OSA patients.

Purpose of the Study:

  • To investigate daytime autonomic dysregulation in patients with obstructive sleep apnea (OSA).
  • To assess the relationship between OSA severity and autonomic function.

Main Methods:

  • Retrospective analysis of 138 adult patients undergoing autonomic testing and polysomnography.
  • Autonomic function was assessed using deep breathing, Valsalva maneuver, and tilt tests.
  • Small fiber neuropathy was evaluated via skin biopsies; OSA severity was determined by the apnea-hypopnea index.

Main Results:

  • 78% of OSA patients exhibited moderate to severe autonomic failure, compared to 60% of non-OSA controls.
  • Autonomic failure scores significantly increased with OSA severity (P < 0.001).
  • Small fiber neuropathy was more prevalent in moderate/severe OSA patients (70.8%) versus controls (41.8%).

Conclusions:

  • Autonomic failure, particularly small fiber autonomic neuropathy, is prevalent in OSA patients.
  • The degree of autonomic failure is directly proportional to OSA severity.
  • Autonomic dysfunction in OSA may represent an additional cardiovascular risk factor.