RCTs and observational studies to determine the effect of prophylaxis in severe haemophilia.

RCTs and observational studies to determine the effect of prophylaxis in severe haemophilia. Research Abstract Details 

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RCTs and observational studies to determine the effect of prophylaxis in severe haemophilia. Abstract Text:

K Fischer,D E Grobbee,H M van den Berg,

It has been suggested that more RCTs should be conducted in the evaluation of haemophilia treatment, including prophylaxis. To draw valid conclusions from experimental or observational studies, internal validity should be ensured. In particular, similarity of prognosis between treatment groups compared in a particular study is needed. Because the use of prophylaxis in observational studies is nonrandomized by definition, special efforts should be made to achieve comparability of prognosis, that is, to avoid 'confounding by indication'; in RCTs this is ensured by randomized allocation of treatment. However, the high costs of an RCT results in a limitation of both patient numbers and length of follow up. Observational studies tend to be more generalizable and cheaper, as they may include a wider spectrum of morbidities, use treatment protocols in agreement with routine care, and use available data. Therefore, observational studies can be much larger and of longer duration than RCTs; and are the preferred design for the evaluation of long term treatment effects. Several valid observational studies comparing prophylaxis and on demand treatment have reported both a short term reduction of 75-90% in bleeding frequency, and significant improvement in arthropathy, quality of life, and socioeconomic parameters after more than 20 years of prophylactic treatment. RCTs provide the most powerful tool for the evaluation of short term effects of any treatment, but are infeasible for the evaluation of long term effects. The definitive assessment of the long-term benefits of prophylaxis requires observational studies that should be performed according to rigorous standards.

RCTs and observational studies to determine the effect of prophylaxis in severe haemophilia. Publishing Authors By Initials

K Fischer,DE Grobbee,HM van den Berg,

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RCTs and observational studies to determine the effect of prophylaxis in severe haemophilia. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Haemophilia : the official journal of the World Fe

VOLUME: 13

Page Numbers: 345-50

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ISSN: 1351-8216

DAY: 5

MONTH: Jul

YEAR: 2007

RCTs and observational studies to determine the effect of prophylaxis in severe haemophilia. Information

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LANGUAGE: eng

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Grant and Affiliation Information for RCTs and observational studies to determine the effect of prophylaxis in severe haemophilia.

AFFILIATION: Van Creveldkliniek, Department of Haematology, UMCU, Utrecht, The Netherlands. k.fischer@umcutrecht.nl

Country: England

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MEDLINETA: Haemophilia

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