Airway obstruction: Difference between revisions
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==Diagnosis== | ==Diagnosis== | ||
===Laboratory Tests== | |||
Obstruction can be measured using [[spirometry]]. A decreased FEV1/VC 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/VC ratio, would produce a reduced [[vital capacity]]. | Obstruction can be measured using [[spirometry]]. A decreased FEV1/VC 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/VC ratio, would produce a reduced [[vital capacity]]. | ||
== | ==Related Chapters== | ||
* [[Stridor]] | * [[Stridor]] | ||
{{Respiratory pathology}} | {{Respiratory pathology}} | ||
[[sl:Obstrukcija dihal]] | [[sl:Obstrukcija dihal]] | ||
[[Category:Abnormal respiration]] | [[Category:Abnormal respiration]] | ||
[[Category:Signs and symptoms]] | [[Category:Signs and symptoms]] | ||
Revision as of 12:35, 27 September 2011
| Airway obstruction | |
| MeSH | D000402 |
|---|---|
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Overview
Airway obstruction is a respiratory problem 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).
Diagnosis
=Laboratory Tests
Obstruction can be measured using spirometry. A decreased FEV1/VC 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/VC ratio, would produce a reduced vital capacity.