title: In vitro effect of ventriculocordectomy before laryngoplasty on abduction of the equine arytenoid cartilage.
abstract: OBJECTIVE
  To determine whether ventriculocordectomy (VCE) performed before prosthetic laryngoplasty (PL) results in increased rima glottidis size compared with PL alone.
  
  
  METHODS
  Experimental study.
  
  
  METHODS
  Equine cadaver larynges (n=13).
  
  
  METHODS
  Right arytenoid cartilages were maximally abducted using a standard PL technique. Standard PLs were then performed on the left side and the force required to maximally abduct the left arytenoid cartilage recorded (F(max) ). Photographs were taken of the rima glottidis at zero force and at five equal levels of force up to F(max) . The force applied was released, left VCE performed, and photographs repeated. Arytenoid left:right angle quotients (LRQ) and glottic cross-sectional area ratios (CSAR) were calculated at each force level in each condition (PL and VCE-PL).
  
  
  RESULTS
  Mean LRQ and CSAR for both PL and VCE-PL increased with increasing force, initially rapidly before plateauing at ~50% of F(max) . LRQ and CSAR were significantly greater for VCE-PL than for PL (P<.001). When VCE was performed before PL, 12% less force was required to achieve an LRQ of 0.8, and 45% less for a CSAR of 0.8.
  
  
  CONCLUSIONS
  In vitro, VCE performed before PL enables the arytenoid cartilage to be abducted to a greater degree for a given PL suture force.
authors.affiliation: Department of Veterinary Clinical Sciences, Royal Veterinary College, Hawkshead Lane, North Mymms, Hatfield, Hertfordshire, UK. jperkins@rvc.ac.uk
authors.forename: Justin D
authors.initials: JD
authors.lastname: Perkins
authors.forename: Hazel
authors.initials: H
authors.lastname: Meighan
authors.forename: Zoë
authors.initials: Z
authors.lastname: Windley
authors.forename: Susanne
authors.initials: S
authors.lastname: Troester
authors.forename: Richard
authors.initials: R
authors.lastname: Piercy
authors.forename: Jim
authors.initials: J
authors.lastname: Schumacher
mesh_terms: D000818:Animals; D001193:Arytenoid Cartilage / Q000601:surgery*; D002102:Cadaver; D005931:Glottis / Q000033:anatomy & histology; D006736:Horses; D058753:Laryngoplasty / Q000379:methods / Q000662:veterinary*