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The association between gastro-oesophageal reflux disease and asthma: a systematic review
  1. B D Havemann1,
  2. C A Henderson2,
  3. H B El-Serag1
  1. 1
    Sections of Gastroenterology and Health Services Research at the Houston Department of Veterans Affairs Medical Center, and Department of Medicine, Baylor College of Medicine, Houston, Texas, USA
  2. 2
    Research Evaluation Unit, Oxford PharmaGenesis Ltd, Oxford, UK
  1. H B El-Serag, Gastroenterology and Health Services Research Sections, Michael E DeBakey VA Medical Center and Baylor College of Medicine, Houston, Texas, USA; hasheme{at}bcm.tmc.edu

Abstract

Background and aim: Gastro-oesophageal reflux disease (GORD) has been linked to a number of extra-esophageal symptoms and disorders, primarily in the respiratory tract. This systematic review aimed to provide an estimate of the strength and direction of the association between GORD and asthma.

Methods: Studies that assessed the prevalence or incidence of GORD in individuals with asthma, or of asthma in individuals with GORD, were identified in Medline and EMBASE via a systematic search strategy.

Results: Twenty-eight studies met the selection criteria. The sample size weighted average prevalence of GORD symptoms in asthma patients was 59.2%, whereas in controls it was 38.1%. In patients with asthma, the average prevalence of abnormal oesophageal pH, oesophagitis and hiatal hernia was 50.9%, 37.3% and 51.2%, respectively. The average prevalence of asthma in individuals with GORD was 4.6%, whereas in controls it was 3.9%. Pooling the odds ratios gave an overall ratio of 5.5 (95% CI 1.9–15.8) for studies reporting the prevalence of GORD symptoms in individuals with asthma, and 2.3 (95% CI 1.8–2.8) for those studies measuring the prevalence of asthma in GORD. One