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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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Pulmonary hypertension (PH) is a severe health condition in which the mean pulmonary arterial pressure increases to 25 mmHg or more, even when the body is at rest. This high pressure in the blood vessels that transport blood from the heart to the lungs can cause various symptoms, including shortness of breath, can lead to right heart failure, and significantly affect the overall quality of life.
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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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Asthma-II: Pathophysiology and Classification01:26

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Asthma is a prevalent chronic respiratory condition marked by inflammation and hyperresponsiveness of the airways. Its pathophysiology involves complex interactions among inflammatory pathways, immune responses, and neural mechanisms.
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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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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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Drug-Induced Sleep Endoscopy DISE with Target Controlled Infusion TCI and Bispectral Analysis in Obstructive Sleep Apnea
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Central sleep apnea: pathophysiologic classification.

Shahrokh Javaheri1,2,3, M Safwan Badr4

  • 1Division of Pulmonary and Sleep Medicine, Bethesda North Hospital, Cincinnati, OH, USA.

Sleep
|May 13, 2022
PubMed
Summary
This summary is machine-generated.

Central sleep apnea involves breathing instability, often linked to reduced carbon dioxide levels (PaCO2) or brainstem inhibition. Understanding loop gain (LG) helps measure this instability in various clinical conditions.

Keywords:
Adaptive-Servo Ventilation (ASV)apneic thresholdbi-level positive pressure therapy (BPAP)central apneacontinuous positive pressure therapy (CPAP)controller gainhypocapnialoop gainplant gain

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Area of Science:

  • Sleep Medicine
  • Respiratory Physiology
  • Neuroscience

Background:

  • Central sleep apnea (CSA) is a complex disorder, not a single entity, presenting alone or with other conditions.
  • CSA pathophysiology involves sleep's influence on ventilatory drive and hypocapnia, reducing breathing output below the apneic threshold (PaCO2).
  • CSA is increasingly viewed as breathing instability, characterized by cyclical apnea/hypopnea and hyperpnea, particularly in heart failure.

Approach:

  • This review examines the pathogenesis and pathophysiologic classification of CSA.
  • It explores the role of the "loop gain" (LG) concept in quantifying ventilatory instability.
  • The review discusses diverse clinical conditions associated with CSA, including opioid use and its effect on brainstem rhythm generation.

Key Points:

  • Reduced PaCO2 below the apneic threshold is a key factor in CSA, especially in heart failure.
  • Increased loop gain (LG) is a significant indicator of ventilatory instability and CSA susceptibility.
  • Opioids can cause CSA by directly inhibiting respiratory rhythm generation in the brainstem.

Conclusions:

  • Central sleep apnea arises from various mechanisms, including hypocapnia-induced ventilatory instability and direct brainstem inhibition.
  • The concept of loop gain provides a valuable metric for assessing CSA risk and severity.
  • Further research is needed to fully elucidate the complexities and clinical implications of CSA across different conditions.