Document Detail

The dynamic face of respiratory research: understanding the effect of airway disease on a lung in constant motion.
MedLine Citation:
PMID:  21463699     Owner:  NLM     Status:  Publisher    
The lungs are in a constant state of motion. The dynamic nature of tidal breathing, whereby cycles of pressure changes across the lungs cause the chest wall, lung tissue and airways to repeatedly expand and contract, ventilates the lung tissue and allows respiration to occur. However, these regular cycles of tidal inspirations and expirations are punctuated by breaths of differing volumes, most particularly periodic deep inspirations. In normal, healthy subjects, these deep inspirations have a dual effect in reducing airway responsiveness. Firstly, deep inspirations taken under baseline conditions protect the airways against subsequent bronchoconstriction, termed DI bronchoprotection. Secondly, deep inspirations are able to dramatically reverse bronchoconstriction. The ability for deep inspirations to reverse bronchoconstriction appears to be due to both the ability to dilate the airways with a full inspiration to total lung capacity (TLC) and the rate at which the airways re-narrow once tidal breathing is resumed. Deep inspiration reversal is reduced in subjects with asthma and is due both to a reduced ability to dilate the airways as well as an increase in the rate of re-narrowing. On the other hand, DI bronchoprotection is completely absent in asthma. Although the mechanisms behind these abnormalities remain unclear, the inability for deep inspirations to both protect against and fully reverse bronchoconstriction in patients with asthma appears critical in the development of airway hyperresponsiveness. As such, determining the pathophysiology responsible for the malfunction of deep inspirations in asthma remains critical to understanding the disease and is likely to pave the way for novel therapeutic targets.
David G Chapman; Nathan J Brown; Cheryl M Salome
Related Documents :
18182939 - Effects of estradiol and the angiotensin ii receptor blocker irbesartan on vascular fun...
8586809 - Central nervous system mediates an antihypertensive property in glucocorticoid hyperten...
645899 - Aldosterone metabolism in isolated perfused rat kidney.
24674349 - Are we estimating the adverse effects of shock-wave lithotripsy on a faulty scale?
2743599 - Increased sympathetic nerve activity at home in young subjects with hypertension.
7792819 - Mineralocorticoid modulation of central control of blood pressure.
3228529 - Direct mail as a prompt for follow-up care among persons at risk for hypertension.
18182409 - The impact of sex in primary glomerulonephritis.
18323249 - Pharmacognosy and hypotensive evaluation of ficus exasperata vahl (moraceae) leaf.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-4-1
Journal Detail:
Title:  Pulmonary pharmacology & therapeutics     Volume:  -     ISSN:  1522-9629     ISO Abbreviation:  -     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-4-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9715279     Medline TA:  Pulm Pharmacol Ther     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011. Published by Elsevier Ltd.
Woolcock Institute of Medical Research, Sydney, NSW, Australia; Cooperative Research Centre for Asthma and Airways, Sydney, NSW, Australia; The University of Sydney, Sydney, NSW, Australia.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Crocodilian Phylogeny Inferred from Twelve Mitochondrial Protein-Coding Genes, with New Complete Mit...
Next Document:  Mast cells and COPD.