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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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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.
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Physiological Control of Respiration01:23

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Physical assessment of the respiratory tract through inspection is a crucial step in understanding the patient's respiratory health. It provides insights into the functioning of the respiratory system, the musculoskeletal structure, and even the patient's nutritional status. This comprehensive approach involves observing several vital aspects: chest configuration, breathing patterns, respiratory rates, skin color, and use of accessory muscles.
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Mechanism of Breathing I: Inspiration01:30

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Updated: Dec 3, 2025

Drug-Induced Sleep Endoscopy DISE with Target Controlled Infusion TCI and Bispectral Analysis in Obstructive Sleep Apnea
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Normal and obstructive breathing physiology during sleep.

Jens Kerl1, Pia Noeke2, Detlev Heyse2

  • 1Fachkrankenhaus Kloster Grafschaft GmbH, Annostr. 1, 57392, Schmallenberg, Germany. j.kerl@fkkg.de.

Sleep & Breathing = Schlaf & Atmung
|October 31, 2020
PubMed
Summary
This summary is machine-generated.

The obstructive coefficient (OC) quantifies inspiratory flow flattening in sleep apnea (OSA) patients. Esophageal pressure (EP) is the key marker differentiating OSA severity, not breath flattening alone.

Keywords:
Breathing physiologyEsophageal manometryFlow limitationNasal cannulaPressure transducerSleep apnea

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Area of Science:

  • Sleep Medicine
  • Respiratory Physiology

Background:

  • Obstructive sleep apnea (OSA) diagnosis often relies on respiratory event indices.
  • Quantifying inspiratory flow limitation during sleep is crucial for assessing OSA severity.
  • Previous methods for analyzing breath-by-breath flow limitation have been unsuccessful.

Purpose of the Study:

  • To develop and validate a novel automated parameter, the obstructive coefficient (OC), for quantifying inspiratory flow limitation in OSA.
  • To assess the relationship between OC, esophageal pressure (EP), and OSA severity.

Main Methods:

  • Developed an automated parameter, the obstructive coefficient (OC), to analyze inspiratory flow curve flattening.
  • Conducted polysomnography with esophageal manometry in 25 subjects (10 healthy, 9 mild OSA, 6 severe OSA).
  • Analyzed 104,608 breaths, correlating OC with esophageal pressure (EP).

Main Results:

  • No significant differences in airway patency histogram profiles were observed between study groups.
  • Increased esophageal pressure (EP) correlated with increased respiratory disturbance index (RDI), indicating OSA severity.
  • A distinct shift in OC and EP values during N3 sleep was noted between healthy subjects and OSA patients.

Conclusions:

  • The obstructive coefficient (OC) allows for breath-by-breath quantification of inspiratory flow flattening.
  • Esophageal pressure (EP) required to achieve a given airflow is the sole parameter differentiating OSA severity.
  • The ratio of limited to less limited breaths remained consistent across all study groups.