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Brief mechanical ventilation impacts airway cartilage properties in neonatal lambs
Author(s) -
Kim Minwook,
Pugarelli Joan,
Miller Thomas L.,
Wolfson Marla R.,
Dodge George R.,
Shaffer Thomas H.
Publication year - 2012
Publication title -
pediatric pulmonology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.866
H-Index - 106
eISSN - 1099-0496
pISSN - 8755-6863
DOI - 10.1002/ppul.21616
Subject(s) - medicine , cartilage , airway , extracellular matrix , tracheomalacia , mechanical ventilation , in vivo , anatomy , elastin , ventilation (architecture) , pathology , biomedical engineering , anesthesia , microbiology and biotechnology , biology , mechanical engineering , engineering
Ultrasound imaging allows in vivo assessment of tracheal kinetics and cartilage structure. To date, the impact of mechanical ventilation (MV) on extracellular matrix (ECM) in airway cartilage is unclear, but an indication of its functional and structural change may support the development of protective therapies. The objective of this study was to characterize changes in mechanical properties of the neonatal airway during MV with alterations in cartilage ECM. Trachea segments were isolated in a neonatal lamb model; ultrasound dimensions and pressure–volume relationships were measured on sham (no MV; n = 6) and MV (n = 7) airways for 4 hr. Tracheal cross‐sections were harvested at 4 hr, tissues were fixed and stained, and Fourier transform infrared imaging spectroscopy (FT‐IRIS) was performed. Over 4 hr of MV, bulk modulus (28%) and elastic modulus (282%) increased. The MV tracheae showed higher collagen, proteoglycan content, and collagen integrity (new tissue formation); whereas no changes were seen in the controls. These data are clinically relevant in that airway properties can be correlated with MV and changes in cartilage ECM. MV increases the in vivo dimensions of the trachea and is associated with evidence of airway tissue remodeling. Injury to the neonatal airway from MV may have relevance for the development of tracheomalacia. We demonstrated active airway tissue remodeling during MV using an FT‐IRIS technique which identifies changes in ECM. Pediatr Pulmonol. 2012. 47:763–770. © 2011 Wiley Periodicals, Inc.