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Sökning: WFRF:(Liew T.) > (2016)

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  • Wang, Allen Y., et al. (författare)
  • Rat model of chronic tympanic membrane perforation : Ventilation tube with mitomycin C and dexamethasone
  • 2016
  • Ingår i: International Journal of Pediatric Otorhinolaryngology. - : Elsevier BV. - 0165-5876 .- 1872-8464. ; 80:1, s. 61-68
  • Tidskriftsartikel (refereegranskat)abstract
    • Objective: Chronic tympanic membrane perforation (TMP) in a clinical setting may attract surgical intervention. With the advent of modern biomaterials, new options are available for myringoplasty but safety and efficacy need evaluation in a chronic TMP animal model. The aim of this study was to evaluate the efficacy of ventilation tube (VT) insertion in conjunction with topical application of mitomycin Cl dexamethasone (M/D) for the creation of chronic TMP in rats. Methods: Thirty male Sprague-Dawley rats underwent myringotomy of the right tympanic membrane (TM) and were divided into three experimental groups: spontaneous healing (myringotomy control), VT insertion for 2 weeks and VT insertion for 2 weeks in conjunction with topical application of M/D (VT-M/D). All TMs were regularly assessed by otoscopy for 10 weeks and then animals were sacrificed for histological evaluation. Results: In the VT-M/D group, seven out of ten (70%) perforations were patent at 10 weeks (mean patency, 57.9 days; P < 0.01). The VT group had two out of ten (20%) perforations patent at 10 weeks (mean patency, 26.5 days; P < 0.01), while all TMPs from the myringotomy control group were closed by day 9 (mean patency, 7.2 days). Histologically, the TMPs patent at week 10 had a stratified squamous epithelialized rim, keratinocyte layer thickening around the perforation edge as well as increased collagen deposition and macrophage infiltration. Conclusion: Chronic TMP in a rat model was successfully created by VT insertion and the efficacy was increased in combination with topical application of M/D.
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