Monday, June 11, 2012

Fibromyalgia and Pregabalin - some ideas on an old study



The pregabalin study by Crofford was looking at subjective outcome parameters like pain (primary endpoint of the study has been a reduction on the pain numeric rating scale [range 0-10] of at least 50%), but the study didn't adjust for the subjective, confounding parameters like dizziness. 15% of the placebo group patients suffered from dizziness, in the 450 mg verum group of patients (only group that had significantly more patients on a reduction of 50% in the pain scale) about 65% suffered from dizziness, however.

I see an enhanced placebo effect, that the statistics used, cannot detect. Moreover, even in the significant verum group only less than 30% reached the 50% improvement level.

(Somehow I worked ideas out that I already told you about on this blog: http://rheumatologe.blogspot.de/2011/12/what-is-lacking-in-fibromyalgia-studies.html )

04.04.2014:
I've just took the data of the study and put it in chart to compare efficacy with just one side effect (dizziness - in the chart "Schwindel"). Schwindel is the German word for dizziness/vertigo, but it also means fraud. Efficacy rises slowly with increasing the dosage of pregabalin, but the percentage of dizziness rises dramatically.




3 comments:

  1. Very clever, Herr Doktor. I've stolen the Schwindel for my 'Bad Medicine' post, thanx!

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    Replies
    1. You're welcome! And it has been both fun and gain to look at your homepage: http://fnmyalgia.com/.

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    2. This stopped being funny when a member of our online support group blacked out at the wheel for a second time. Fat, dumb(-ed down), and (un) happy has gone on too long - which is why lawyers associated with the ACCC's anti-competitive action against Pfizer over atorvastatin just received some extra insight on their research ethics.

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