World Library  
Flag as Inappropriate
Email this Article

Airway obstruction

Article Id: WHEBN0003290115
Reproduction Date:

Title: Airway obstruction  
Author: World Heritage Encyclopedia
Language: English
Subject: Head tilt/Chin lift, BODE index, Abnormal respiration, Jaw-thrust maneuver, Surgical emergency
Collection: Abnormal Respiration
Publisher: World Heritage Encyclopedia

Airway obstruction

Airway obstruction
Classification and external resources
MeSH D000402

Airway obstruction is a blockage of respiration in the airway. It can be broadly classified into being either in the upper airway or lower airway.


  • Upper airway obstruction 1
  • Lower airway obstruction 2
  • Consequences 3
  • References 4
  • See also 5

Upper airway obstruction

Causes of upper airway obstruction, foreign body aspiration, blunt laryngotracheal trauma, penetrating laryngotracheal trauma, tonsillar hypertrophy, paralysis of the vocal cord or vocal fold, acute laryngotracheitis such as viral croup, bacterial tracheitis, epiglottitis, peritonsillar abscess, pertussis, retropharyngeal abscess, spasmodic croup.[1] In basic and advanced life support airway obstructions are often referred to as A-problems. Management of airways relies on both minimal-invasive and invasive techniques.

Lower airway obstruction

Lower airway obstruction is mainly caused by increased resistance in the bronchioles (usually from a decreased radius of the bronchioles) that reduces the amount of air inhaled in each breath and the oxygen that reaches the pulmonary arteries. It is different from airway restriction (which prevents air from diffusing into the pulmonary arteries because of some kind of blockage in the lungs). Diseases that cause lower airway obstruction are termed obstructive lung diseases.

Lower airway obstruction can be measured using spirometry. A decreased FEV1/FVC ratio (versus the normal of about 80%) is indicative of an airway obstruction, as the normal amount of air can no longer be exhaled in the first second of expiration. An airway restriction would not produce a reduced FEV1/FVC ratio, would produce a reduced vital capacity. The ventilation is therefore affected leading to a ventilation perfusion mismatch and hypoxia.


Airway obstruction may cause obstructive pneumonitis or post-obstructive pneumonitis.


  1. ^ Acute Upper Airway Obstruction, section Respiratory Emergencies. From FP Essentials 368. January 2010 by American Academy of Family Physicians.

See also

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.