title: Laryngeal pseudosulcus as a predictor of laryngopharyngeal reflux.
abstract: OBJECTIVE
  Laryngeal pseudosulcus is an accurate prognostic indicator of laryngopharyngeal reflux (LPR) disease.
  
  
  METHODS
  Prospective study of 20 consecutive patients with laryngeal pseudosulcus. Pseudosulcus is infraglottic laryngeal edema that is thought to be secondary to LPR. All patients were evaluated with dual-channel pH probe 24-hour monitoring to evaluate for the presence of laryngopharyngeal reflux.
  
  
  METHODS
  Twenty patients identified with laryngeal pseudosulcus on routine physical examination were included in the study. Each patient underwent a 24-hour dual-channel pH probe. The data were analyzed and compared with previously published normative data. The data included the total number of reflux episodes and the percentage of time the pH dropped below 4 at the proximal probe.
  
  
  RESULTS
  Eighteen of the 20 patients with laryngeal pseudosulcus were found to have LPR. The mean number of reflux episodes at the proximal probe was 29.4 (range, 3-82). The mean percentage of time the pH dropped below 4 was 1.15%. In the upright position the mean value was 1.59% and in the supine position it was 0.19%. This gives pseudosulcus a positive predictive value for LPR of 90%.
  
  
  CONCLUSIONS
  This study shows laryngeal pseudosulcus to be an accurate predictor of laryngopharyngeal reflux disease.
authors.affiliation: Department of Otolaryngology--Head and Neck Surgery, University of Texas Health Science Center, San Antonio, Texas 78229-3900, USA.
authors.forename: C
authors.initials: C
authors.lastname: Hickson
authors.forename: C B
authors.initials: CB
authors.lastname: Simpson
authors.forename: R
authors.initials: R
authors.lastname: Falcon
mesh_terms: D000328:Adult; D000368:Aged; D003937:Diagnosis, Differential; D004942:Esophagitis, Peptic / Q000175:diagnosis*; D005260:Female; D005745:Gastric Acidity Determination; D006801:Humans; D007819:Laryngeal Edema / Q000175:diagnosis*; D007827:Laryngitis / Q000175:diagnosis*; D007828:Laryngoscopy; D008297:Male; D008875:Middle Aged; D018670:Monitoring, Ambulatory; D010612:Pharyngitis / Q000175:diagnosis*; D011379:Prognosis