title: Use of AlloDerm implant to prevent frey syndrome after parotidectomy.
abstract: OBJECTIVE
  To evaluate the effectiveness of AlloDerm, an acellular human dermal matrix graft, as an interpositional physical barrier to prevent the development of Frey syndrome after parotidectomy.
  
  
  METHODS
  The 30 patients included in the study were divided into 3 groups of 10. In group 1 (study group), patients underwent superficial parotidectomy with placement of an AlloDerm graft (LifeCell Corp, Branchburg, NJ). In group 2 (control) patients had superficial parotidectomy without placement of an interpositional barrier. In group 3 (control), patients underwent deep-plane rhytidectomy without disruption of the parotid fascia. All were evaluated after 1 year and questioned about gustatory sweating. Subjective assessment of Frey syndrome was documented when patients experienced gustatory sweating, even if they were not perturbed by the symptom. The Minor starch-iodine test was performed in each patient for objective assessment.
  
  
  RESULTS
  The incidence of subjective Frey syndrome was observed in 1 patient in group 1 and 5 patients in group 2. The incidence of objective Frey syndrome was noted in 2 patients in group 1 and 8 patients in group 2. Both subjective and objective differences in incidence of Frey syndrome were statistically significant. None of the group 3 patients had subjective or objective Frey syndrome. Two patients in group 1 and 3 patients in group 2 developed a transient seroma or sialocele that resolved with conservative management.
  
  
  CONCLUSIONS
  The use of AlloDerm graft as an interpositional barrier improves parotidectomy outcome by reducing the incidence of Frey syndrome.
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, University of Southern California School of Medicine, 1200 N State St, Box 795, Los Angeles, CA 90033, USA. sinhauk@aol.com
authors.forename: Uttam K
authors.initials: UK
authors.lastname: Sinha
authors.forename: Daryoush
authors.initials: D
authors.lastname: Saadat
authors.forename: Carolyn M
authors.initials: CM
authors.lastname: Doherty
authors.forename: Dale H
authors.initials: DH
authors.lastname: Rice
mesh_terms: D001672:Biocompatible Materials / Q000627:therapeutic use*; D003094:Collagen / Q000627:therapeutic use*; D006801:Humans; D019647:Oral Surgical Procedures / Q000009:adverse effects*; D010306:Parotid Gland / Q000601:surgery*; D019736:Prostheses and Implants; D019651:Plastic Surgery Procedures / Q000379:methods; D013547:Sweating, Gustatory / Q000209:etiology* / Q000517:prevention & control*; D016896:Treatment Outcome
chemical_list: C440568:Alloderm; D001672:Biocompatible Materials; D003094:Collagen