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Related Concept Videos

Sleep Apnea01:21

Sleep Apnea

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...
Other Pulmonary Disorders01:17

Other Pulmonary Disorders

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.
Sleep-Wake Cycles01:24

Sleep-Wake Cycles

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:
Chronic Obstructive Pulmonary Disease01:24

Chronic Obstructive Pulmonary Disease

COPD is defined as a heterogeneous lung condition marked by persistent respiratory symptoms such as dyspnea, cough, and sputum production, caused by abnormalities in the airways that cause airflow obstruction.
Smoking is a primary risk factor for COPD, with over 80% of patients having a history of it. Patients typically experience progressive dyspnea or labored breathing, frequent coughing, and recurrent pulmonary infections. Many eventually succumb to respiratory failure, characterized by...
Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...
Hyperpnea and Hyperventilation01:25

Hyperpnea and Hyperventilation

Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...

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Updated: May 11, 2026

Drug-Induced Sleep Endoscopy (DISE) with Target Controlled Infusion (TCI) and Bispectral Analysis in Obstructive Sleep Apnea
07:54

Drug-Induced Sleep Endoscopy (DISE) with Target Controlled Infusion (TCI) and Bispectral Analysis in Obstructive Sleep Apnea

Published on: December 6, 2016

Obstructive sleep apnea.

David P White1, Magdy K Younes

  • 1Harvard Medical School and Brigham and Women's Hospital, Boston, Massachusetts, USA. dpwhite@partners.org

Comprehensive Physiology
|May 31, 2013
PubMed
Summary
This summary is machine-generated.

Obstructive sleep apnea (OSA) involves airway collapse during sleep due to anatomical and muscle control factors. Patient mechanisms vary, influenced by airway size, muscle activation, and chemical drive, leading to diverse causes of sleep apnea.

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Area of Science:

  • Sleep Medicine
  • Respiratory Physiology
  • Otolaryngology

Background:

  • Obstructive sleep apnea (OSA) is a prevalent condition marked by repeated pharyngeal airway collapse during sleep.
  • Pharyngeal patency relies on airway anatomy and dilator muscle activity, regulated by respiratory drive, reflexes, and sleep state.
  • Patients with OSA often have smaller airways, maintained by muscle activation during wakefulness but compromised during sleep onset.

Purpose of the Study:

  • To explore the diverse physiological mechanisms underlying obstructive sleep apnea (OSA).
  • To understand the variable contributions of different factors to OSA pathogenesis among patients.

Main Methods:

  • Review of physiological characteristics influencing pharyngeal airway stability during sleep.
  • Analysis of factors such as upper airway anatomy, dilator muscle activation, chemical drive, and arousal thresholds.
  • Consideration of additional mechanisms like lung volume changes, fluid shifts, and airway edema.

Main Results:

  • OSA mechanisms differ significantly among individuals.
  • Key contributing factors include airway size, dilator muscle function, respiratory control, and arousal patterns.
  • Other mechanisms like reduced lung volume, fluid shifts, and airway edema also play a role.

Conclusions:

  • The underlying causes of obstructive sleep apnea (OSA) are heterogeneous and vary substantially between patients.
  • Understanding these individual variations is crucial for effective OSA management.
  • Progressive apnea severity may be linked to weight gain, aging, and changes in ventilatory control.