Background HHT is an autosomal dominant disease with an estimated prevalence of at least 1/5000 which can frequently be complicated by the presence of clinically significant arteriovenous malformations in the brain, lung, gastrointestinal tract and liver. HHT is under-diagnosed and families may be unaware of the available screening and treatment, leading to unnecessary stroke and life-threatening hemorrhage in children and adults.
Objective The goal of this international HHT guidelines process was to develop evidence-informed consensus guidelines regarding the diagnosis of HHT and the prevention of HHT-related complications and treatment of symptomatic disease.
Methods The overall guidelines process was developed using the AGREE framework, using a systematic search strategy and literature retrieval with incorporation of expert evidence in a structured consensus process where published literature was lacking. The Guidelines Working Group included experts (clinical and genetic) from eleven countries, in all aspects of HHT, guidelines methodologists, health care workers, health care administrators, HHT clinic staff, medical trainees, patient advocacy representatives and patients with HHT. The Working Group determined clinically relevant questions during the pre-conference process. The literature search was conducted using the OVID MEDLINE database, from 1966 to October 2006. The Working Group subsequently convened at the Guidelines Conference to partake in a structured consensus process using the evidence tables generated from the systematic searches.
Results The outcome of the conference was the generation of 33 recommendations for the diagnosis and management of HHT, with at least 80% agreement amongst the expert panel for 30 of the 33 recommendations.
- hereditary hemorrhagic telangiectasia
- arteriovenous malformation
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The HHT Guidelines Working Group intends to generate updated clinical guidelines within approximately 5 years.
Centres with recognised expertise in the diagnosis and management of HHT can be located at http://www.hht.org/, the website for the HHT Foundation International.
Funding John Abele on behalf of the Argosy Foundation, HHT Foundation International Inc, Canadian Institutes of Health Research, St Michael's Hospital Department of Medicine. Financial support for MEF: Nelson Arthur Hyland Foundation, Li Ka Shing Knowledge Institute of St Michael's Hospital.
Competing interests VP received an honorarium for attending the HHT Guidelines Conference. DP received a grant (completed) from the Ethek F Donahue Foundation to study hormonal therapy in HHT.
Provenance and peer review Not commissioned; externally peer reviewed.
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