title: Patient self-assessment of test-day symptoms in 24-h pH-metry for suspected gastroesophageal reflux disease.
abstract: BACKGROUND
  Marked daily fluctuations may occur in the pattern and degree of gastroesophageal reflux (GOR) and in patients' symptoms. The aim of this study was to observe how patients' self-assessment of their symptoms on the day of a 24-h pH test correlates with the likely outcome of the test and the potential value in repeating it.
  
  
  METHODS
  367 patients with symptoms suggestive of GOR underwent 24-h pH tests. Fifty-eight patients had repeat studies. Patients assessed the severity of their test-day symptoms as 'better than typical', 'typical' or 'worse than typical'.
  
  
  RESULTS
  A 'typical' or 'worse than typical' day was more likely to produce an abnormal test result (P < 0.0001). A normal first test on a 'better than typical' day was more likely to be followed by an abnormal second test than a normal first test on a 'typical' or 'worse than typical' day (55% versus 22%; P = 0.025). The symptom index score, the total acid exposure time on the first test and the presence of oesophagitis were not associated with an abnormal second test (P not significant).
  
  
  CONCLUSIONS
  Patients' self-assessment of the severity of their test-day symptoms should be included in the interpretation of 24-h pH tests for suspected GOR. Patients with a normal pH test on a 'better than typical day warrant a repeat test.
authors.affiliation: Dept. of Surgery, Royal Berkshire Hospital, Reading, UK. mlb@1chapel.fsnet.co.uk
authors.forename: M I
authors.initials: MI
authors.lastname: Booth
authors.forename: J
authors.initials: J
authors.lastname: Stratford
authors.forename: T C
authors.initials: TC
authors.lastname: Dehn
mesh_terms: D016099:Endoscopy, Gastrointestinal / Q000009:adverse effects; D005764:Gastroesophageal Reflux / Q000175:diagnosis*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D010349:Patient Compliance; D011237:Predictive Value of Tests; D012647:Self-Assessment; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires