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From: Evidence based health (EBH) <[log in to unmask]
To: [log in to unmask]
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Sent: Sat Apr 03 17:00:38 2010
Subject: Do you know good examples where guidelines ignore evidence?
Do you have examples of guidelines that appear to ignore or contradict
evidence? For example, self-monitoring of blood glucose has been
recommended by many guidelines (including ADA and NICE guidelines in
2008) despite weak evidence, and in 2007 the DiGEM trial which pretty
clearly showed no benefit (and perhaps some harm). We are particularly
interested examples that might help us understand *why* some guidelines
appear to ignore evidence, but we'd also be interested in studies that
simply document the extent to which guidelines use best evidence, e.g,
Andy Oxman's 2007 review of WHO guidelines showing that "Systematic
reviews and concise summaries of findings are rarely used for developing
Paul Glasziou & Chris Del Mar
1. Farmer A et al Impact of self monitoring of blood glucose in the
management of patients with non-insulin treated diabetes: open parallel
group randomised trial. BMJ. 2007 Jul 21;335(7611):132. Epub 2007 Jun 25.
(The ADA guidelines were "revised October 2007, published 2008 but do
not mention the July 2007 trial; the NICE guidelines mention DiGEM but
state it was not published at the time of writing).
2. Oxman AD, Lavis JN, Fretheim A. Use of evidence in WHO
recommendations. Lancet. 2007 Jun 2;369(9576):1883-9.