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Related Concept Videos

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Respiratory volumes are crucial metrics, meticulously measured to quantify the air exchanged in and out of the lungs during various phases of the breathing cycle. These precise measurements are vital for assessing lung function, diagnosing respiratory conditions, and monitoring overall respiratory health. Each parameter provides specific insights into the mechanics of breathing and the functional capacity of the lungs.
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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.
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Respiratory Volumes and Capacities I01:26

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Assessing the respiratory rate and rhythm for a complete minute is crucial for evaluating the breathing pattern. Even a minor increase in the patient's average respiratory rate, by as little as three to five breaths per minute, is an early and vital indicator of respiratory distress. Patients with a respiratory rate exceeding twenty-four breaths per minute require close monitoring to determine the physiological alterations. This careful observation is essential for prompt recognition and...
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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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Respiratory Depth
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Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
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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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Change in End-Expiratory Lung Volume During Sleep in Patients at Risk for Obstructive Sleep Apnea.

Patrick Koo1, Eric J Gartman1, Jigme M Sethi1

  • 1Alpert Medical School of Brown University, Memorial Hospital of Rhode Island, Pawtucket, Rhode Island.

Journal of Clinical Sleep Medicine : JCSM : Official Publication of the American Academy of Sleep Medicine
|June 22, 2017
PubMed
Summary

End-expiratory lung volume (EELV) decreases after sleep onset, particularly during REM sleep. This reduction in EELV is linked to lower oxygen saturation but not necessarily to more severe sleep-disordered breathing.

Keywords:
REM sleepend-expiratory lung volumemagnetometrysleep-disordered breathing

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Area of Science:

  • Respiratory Physiology
  • Sleep Medicine
  • Medical Instrumentation

Background:

  • Reduced lung volume decreases upper airway traction, increasing collapsibility.
  • Understanding lung volume changes during sleep is crucial for respiratory health.

Purpose of the Study:

  • To measure changes in end-expiratory lung volume (EELV) after sleep onset.
  • To assess the relationship between EELV changes and sleep-disordered breathing.

Main Methods:

  • Overnight polysomnography was conducted on 20 subjects, with 14 diagnosed with obstructive sleep apnea (OSA).
  • End-expiratory lung volume (EELV) changes were continuously monitored using magnetometry.
  • Magnetometry measurements were validated against spirometry in awake subjects.

Main Results:

  • EELV declined across all sleep stages (N1, N2, N3, and REM), with the greatest reduction observed during REM sleep (316.7 ± 131.9 mL).
  • Mean EELV reduction during REM sleep was significantly greater than during non-REM sleep (P < .001).
  • The difference in EELV between REM and non-REM sleep showed an inverse correlation with mean oxygen saturation (r = -0.56, P = .06).

Conclusions:

  • Magnetometry offers a precise and non-invasive method for tracking lung volume changes during sleep.
  • EELV decreases progressively from sleep onset, reaching its lowest point during REM sleep.
  • While reduced EELV during REM sleep is associated with lower oxygen saturation, it was not significantly linked to increased severity of sleep-disordered breathing.