title: Application and validation of a computerized cough acquisition system for objective monitoring of acute cough: a meta-analysis.
abstract: OBJECTIVE
  The purpose of the meta-analysis was to understand the antitussive effect of treatment with dextromethorphan hydrobromide, 30 mg, vs placebo over a 3-h treatment period in patients with cough due to uncomplicated upper respiratory tract infection (URTI), and to show that the computerized system for acquisition and analysis of cough sound was consistent and reproducible across the individual studies.
  
  
  METHODS
  The six studies used for the meta-analysis were randomized, double-blind, parallel-group, single-dose, placebo-controlled studies with a 3-h postdose cough evaluation period.
  
  
  METHODS
  One study was conducted in Durban, South Africa, and five studies were conducted in Bombay, India. Four studies took place in clinics, and two studies were in-home studies.
  
  
  METHODS
  Seven hundred ten adult patients with cough due to uncomplicated URTI who were otherwise healthy and who satisfied the inclusion/exclusion criteria for the meta-analysis.
  
  
  RESULTS
  For each patient, a standard baseline was calculated pretreatment, then a 3-h continuous cough recording was made after treatment was initiated. Five efficacy variables were measured in 30-min intervals: cough bouts, cough components, cough effort, cough intensity, and cough latency. The meta-analysis showed consistent results across most of the studies for each of the efficacy variables. It demonstrated significantly greater overall reductions in cough bouts, cough components, and cough effort, and an increase in cough latency for patients treated with dextromethorphan hydrobromide, 30 mg, vs those treated with placebo.
  
  
  CONCLUSIONS
  The results of a meta-analysis of the six clinical studies show that the antitussive effect of a single dose of dextromethorphan hydrobromide, 30 mg, has been established. The consistent nature of the results shows that the computerized cough acquisition and analysis system is a valid and reproducible methodology for evaluating cough associated with URTI.
authors.affiliation: Clinical Development Department, Procter and Gamble Technical Centers, Staines, Middlesex, United Kingdom. pavesi.l@pg.com
authors.forename: L
authors.initials: L
authors.lastname: Pavesi
authors.forename: S
authors.initials: S
authors.lastname: Subburaj
authors.forename: K
authors.initials: K
authors.lastname: Porter-Shaw
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000996:Antitussive Agents / Q000008:administration & dosage*; D003371:Cough / Q000188:drug therapy*; D003915:Dextromethorphan / Q000008:administration & dosage*; D003936:Diagnosis, Computer-Assisted; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007194:India; D008297:Male; D008875:Middle Aged; D018670:Monitoring, Ambulatory; D016032:Randomized Controlled Trials as Topic; D012141:Respiratory Tract Infections / Q000188:drug therapy; D012815:Signal Processing, Computer-Assisted; D013018:Sound Spectrography
chemical_list: D000996:Antitussive Agents; D003915:Dextromethorphan