title: The importance of the number of reflux episodes in the diagnosis of laryngopharyngeal reflux disease.
abstract: OBJECTIVE
  The aim of this study is to evaluate the sensitivity parameters of the percentage of time the pH is <4 and >7, as well as the total number of laryngopharyngeal reflux episodes in 24 hours, in patients with suspected laryngopharyngeal reflux disease.
  
  
  METHODS
  Retrospective controlled study.
  
  
  METHODS
  University hospital.
  
  
  METHODS
  The study was conducted on 46 patients with laryngopharyngeal reflux disease and 58 healthy controls. Patients and controls underwent 24 hours of dual-probe pH monitoring of the distal and cervical esophagus. Patients completed a Reflux Symptom Index questionnaire and underwent esophageal manometry. Data concerning the percentage of time the pH was <4 and >7 and the number of reflux episodes registered at the cervical esophagus were collected and evaluated.
  
  
  RESULTS
  The percentage of time the pH is <4 and the number of laryngopharyngeal reflux episodes seem to be a reliable diagnostic laryngopharyngeal reflux criterion reaching satisfactory sensitivity (81% and 83%, respectively). Although the pH >7 parameter appeared statistically different between the 2 groups (P < .001), the sensitivity of the test appeared to be poor (55%).
  
  
  CONCLUSIONS
  Our study demonstrates the importance of the absolute number of laryngopharyngeal reflux episodes in 24 hours in the diagnosis of patients with suspected laryngopharyngeal reflux, proposing it as a new diagnostic criterion.
authors.affiliation: Department of Sensory Organs, Division of Otorhinolaryngology, Sapienza University of Rome, Rome, Italy.
authors.forename: Massimo
authors.initials: M
authors.lastname: Fusconi
authors.forename: Armando
authors.initials: A
authors.lastname: De Virgilio
authors.forename: Michela
authors.initials: M
authors.lastname: Conte
authors.forename: Maria Giovanna
authors.initials: MG
authors.lastname: Colicchio
authors.forename: Andrea
authors.initials: A
authors.lastname: Gallo
authors.forename: Antonio
authors.initials: A
authors.lastname: Greco
authors.forename: Giovanni
authors.initials: G
authors.lastname: Ralli
authors.forename: Marco
authors.initials: M
authors.lastname: de Vincentiis
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D006863:Hydrogen-Ion Concentration; D057045:Laryngopharyngeal Reflux / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012720:Severity of Illness Index; D018709:Statistics, Nonparametric; D011795:Surveys and Questionnaires