title: Subglottic injury: a clinically relevant animal model.
abstract: OBJECTIVE
  To develop a clinically aligned, reproducible model for subglottic injury.
  
  
  METHODS
  Prospective randomized control pilot study.
  
  
  METHODS
  Juvenile (3-month-old) New Zealand White rabbits underwent intubation with a 3-cm length of an endotracheal tube that was chosen so that there would be no air leak below 20 cm of water. This tube was one or two sizes above the appropriate tube for the animal. It was held in situ with a suture placed at the trachea and secured over a button in the neck for a period of 1 week. Animals were sacrificed 1 week postextubation, and larynges were harvested. A range of histological techniques and gross morphology were utilized to examine the injury caused at the level of the subglottis. Unintubated animals constituted controlled specimens.
  
  
  RESULTS
  Intubated animals demonstrated considerable histopathology including evidence of ulceration, inflammation, granulation tissue, perichondritis, and chondritis when compared with control animals. Morphometric analysis demonstrated a significant increase in lamina propria thickness (P = .0013), mucosal thickness (P ≤ .0001), and in goblet cell areal density (P = .014). Analysis of mucin types found a significant decrease in acidic (P = .0001) mucin coinciding with a significant increase in mixed mucin types (P = .0013).
  
  
  CONCLUSIONS
  Our model provides a reliable and reproducible technique for acute/subacute injury to the subglottis secondary to intubation, which is consistent with previous histological findings of early changes associated with acquired subglottic stenosis (SGS). Future uses of this model could include the examination of current adjunctive therapies and their effects on limiting progression to SGS.
authors.affiliation: School of Medicine and Medical Science, University College Dublin, Dublin, Ireland. nicola.kelly@ucdconnect.ie
authors.forename: Nicola A
authors.initials: NA
authors.lastname: Kelly
authors.forename: Madeline
authors.initials: M
authors.lastname: Murphy
authors.forename: Seamus
authors.initials: S
authors.lastname: Giles
authors.forename: John D
authors.initials: JD
authors.lastname: Russell
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D005931:Glottis / Q000293:injuries*; D020397:Goblet Cells / Q000473:pathology; D007828:Laryngoscopy; D007829:Laryngostenosis / Q000473:pathology*; D009077:Mucins / Q000032:analysis; D009092:Mucous Membrane / Q000473:pathology; D010865:Pilot Projects; D011446:Prospective Studies; D011817:Rabbits; D015203:Reproducibility of Results
chemical_list: D009077:Mucins