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Related Concept Videos

Trachea01:22

Trachea

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The trachea, commonly known as the windpipe, is a vital part of the human respiratory system. It serves as a passageway for air to travel between the larynx and the bronchi, allowing oxygen to reach the lungs. Let's explore its anatomical features, dimensions, layers of the tracheal wall, associated muscles, and the functions of its parts.
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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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Cardiopulmonary Resuscitation II: ACLS Airway Management01:22

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Airway management is a key skill in emergency and critical care settings, as maintaining a clear airway is essential for adequate oxygenation and ventilation.Head Tilt-Chin Lift TechniqueThe head tilt-chin lift maneuver is an essential technique primarily used in patients without suspected cervical spine injuries. To perform this maneuver, one hand is placed on the patient’s forehead, and gentle pressure is applied backward to tilt the head. The fingertips of the other hand are positioned...
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Assessment of Airway, Skin Color, and Use of Accessory Muscles01:30

Assessment of Airway, Skin Color, and Use of Accessory Muscles

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A thorough assessment of respiratory health is paramount in clinical settings to identify and manage respiratory distress and ensure adequate oxygenation. This article elaborates on the critical aspects of respiratory evaluation, including airway assessment, skin color examination, and the observation of accessory muscle use, which are integral to effectively diagnosing and managing patients with respiratory conditions.
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Suctioning the Oropharyngeal Airway01:25

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In preparing for oropharyngeal airway suctioning, a nurse must gather all necessary equipment, including a suction unit with tubing, a prepackaged suction kit, sterile gloves, water or saline for irrigation, a water-soluble lubricant, and additional personal protective equipment (such as a gown, mask, and goggles) to control infections.
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Related Experiment Video

Updated: Nov 27, 2025

Minimally Invasive Murine Laryngoscopy for Close-Up Imaging of Laryngeal Motion During Breathing and Swallowing
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Minimally Invasive Murine Laryngoscopy for Close-Up Imaging of Laryngeal Motion During Breathing and Swallowing

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Subglottic Stenosis Position Affects Work of Breathing.

Max M Yang1, Nara S Higano2,3, Chamindu C Gunatilaka2,4

  • 1University of Cincinnati College of Medicine, Cincinnati, Ohio, U.S.A.

The Laryngoscope
|December 6, 2020
PubMed
Summary

Subglottic stenosis (SGS) in neonates impacts breathing. Computational fluid dynamics reveal that stenosis location, not just severity, significantly affects the work of breathing (WOB).

Keywords:
Subglottic stenosisimaging, neonatal, computational fluid dynamics, magnetic resonance imagingwork of breathing

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Area of Science:

  • Neonatal airway dynamics
  • Computational fluid dynamics (CFD) in medicine
  • Pediatric respiratory research

Background:

  • Subglottic stenosis (SGS) is the most common neonatal laryngeal stenosis.
  • Current grading relies on percent area of obstruction (%AO), but clinical outcomes vary.
  • Patient-specific airway geometry and flow dynamics influence clinical course.

Purpose of the Study:

  • To investigate the impact of %AO and axial position of SGS on neonatal work of breathing (WOB).
  • To utilize patient-specific imaging and CFD for precise WOB quantification.
  • To explore novel parameters beyond %AO for diagnosing SGS severity.

Main Methods:

  • Acquired high-resolution MRI of neonatal airways.
  • Constructed 3D airway models and introduced virtual SGSs with varying %AO and axial positions.
  • Performed CFD simulations of peak inspiratory flow to calculate patient-specific WOB.

Main Results:

  • CFD simulations demonstrated a clear relationship between stenosis geometry and WOB increase.
  • WOB increased sharply with %AO exceeding 70%.
  • Axial SGS position changes significantly impacted WOB, comparable to a 10% %AO increase, especially with lumen misalignment.

Conclusions:

  • A strong, predictable relationship exists between WOB and the axial position of SGS relative to the glottis.
  • Axial SGS positioning is a critical factor in neonatal respiratory mechanics.
  • Findings may enable precision diagnosis and treatment prediction tools for neonatal SGS.