• Stephen McDonald, Claire D Langton Hewer, and Desmond A Nunez.
• ENT Department, St Michael's Hospital, University Hospitals Bristol NHS Trust, Southwell Street, Bristol, UK, BS2 8EG. stevemcdonald001@hotmail.com
• Cochrane Db Syst Rev. 2008 Jan 1(4):CD004741.

BackgroundAcute suppurative otitis media is one of the most common infectious diseases in childhood. Recurrent acute otitis media is defined for the purposes of this review as either three or more acute infections of the middle ear cleft in a six-month period, or at least four episodes in a year. Strategies for managing the condition include the assessment and modification of risk factors where possible, repeated courses of antibiotics for each new infection, antibiotic prophylaxis and the insertion of ventilation tubes (grommets).ObjectivesTo establish whether ventilation tube insertion reduces the frequency of episodes of recurrent acute otitis media and the proportion of children with symptoms of ear disease.Search StrategyWe searched the Cochrane Ear, Nose and Throat Disorders Group Trials Register, the Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library, Issue 1 2008), MEDLINE (1950 to 2008), EMBASE (1974 to 2008), CINAHL, mRCT (the metaRegister of Controlled Trials for ongoing/unpublished trials), NRR (National Research Register), LILACs, KoreaMed, IndMed, PakMediNet, Zetoc, ISI Proceedings and Cambridge Scientific Abstracts. Reference lists of articles retrieved from the electronic searches were scanned for further trials. Systematic reviews and other meta-analyses were also searched for and their reference lists scanned. Contact was sought with authors of published trials and other experts in the field. The date of the last search was March 2008.Selection CriteriaNo trials that included a treatment and a control group that met the inclusion criteria were excluded. Abstracts were screened and full text articles of studies that met our inclusion criteria obtained. Two authors independently applied the inclusion criteria. Studies included in the review underwent quality assessment performed independently by all authors adapting the methods outlined in the Cochrane Handbook for Systematic Reviews of Interventions.Data Collection And AnalysisData were extracted independently by the authors and synthesised descriptively. Five randomised controlled trials were identified, of which two fulfilled the inclusion criteria.Main ResultsTwo studies involving 148 children were included in the review. One of these studies, involving 95 children, showed that ventilation tube insertion leads to a mean reduction of 1.5 episodes of acute otitis media in the first six months after treatment. This study also showed a significant increase in the proportion of children with no episodes of AOM (p < 0.001) in the ventilation tube group. The other included study also found a higher proportion of patients in the ventilation tube group had no episodes of AOM in the six months after intervention, but the difference did not reach statistical significance (p = 0.16).Authors' ConclusionsVentilation tubes have a significant role in maintaining a 'disease-free' state in the first six months after insertion. Further research is required to investigate the effect beyond six months. Clinicians should consider the possible adverse effects of grommet insertion before surgery is undertaken.

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