New Atmosphere, New Vision: Gibson and Whittemore Kick Off Invest in ME Conference 2016
Mark Berry reports on Dr. Gibson's introduction and Dr. Whittemore's keynote speech, at the 11th Invest in ME International ME Conference in London.
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Clinical criteria versus a possible research case definition in chronic fatigue syndrome/ME

Discussion in 'Latest ME/CFS Research' started by Dolphin, Mar 7, 2017.

  1. Dolphin

    Dolphin Senior Member

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    http://www.tandfonline.com/doi/abs/10.1080/21641846.2017.1299077?journalCode=rftg20
     
  2. Dolphin

    Dolphin Senior Member

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    I found this a bit of an odd paper. It wasn't really much of a surprise I think that homebound patients would be more severely affected than the other 2 groups.
     
  3. Dolphin

    Dolphin Senior Member

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    I think that researchers should start exploring adding together the symptom scores for ME/CFS symptoms and explore what thresholds might be useful for clinical and research criteria.

    Table 3. Composite means for the IOM homebound research criteria (N = 1212).

    Chronic fatigue (n = 304)
    IOM (n = 708)
    Research (n = 200)

    has dozens of different symptoms. For all but 2 of them there is a statistically significant difference across the groups, mostly p<0.001.

    The odd ones out are:
    Feeling like you have a low temp (all around the same)
    Sweating hands (an unofficial trend in the same direction as the other scores)
     
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  4. Dolphin

    Dolphin Senior Member

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    I found this interesting. The Fukuda criteria say the fatigue should not be substantially improved by rest. This is often shortened to "not improved by rest" in the text of many research papers. I wonder what some researchers are doing with this.

    I recall seeing in recent years that the CDC exclude patients if they said they were improved by rest, on a scale of 0 to 4, by 2 or more I think. This could exclude some genuine patients.

    The NIH for their intramural study consulted with the CDC which might end up with them using a similar approach.
     
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  5. Dolphin

    Dolphin Senior Member

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    I think it would be a bit odd to have a research criteria which requires patients to be homebound. It could also make doing research difficult.

    Of course it could be useful for the odd study, I just mean as the norm.
     
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  6. Diwi9

    Diwi9 Senior Member

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    While I appreciate the sample size in this study, self-report measures are a problem for analyzing this disease. How are they able to identify and randomly sample the ME/CFS sufferers, without running into issues of under-diagnosis and over-inclusion? It seems like restricted access to healthcare means that it is the same patient cohort representing this disease in multiple studies. Also, sufferers' perceptions of their health and functioning can be impacted by so many variables, including the fact that this cohort likely has some level of medical attention.
     
  7. Esther12

    Esther12 Senior Member

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    In terms of how I feel, I improve a lot with rest. It's not curative, and doesn't allow me to then return to normal activity levels, but I can get to the point of not feeling that ill when I really don't have to do anything. That part of the Fukuda criteria has always been a bit confusing for me.
     
  8. Dolphin

    Dolphin Senior Member

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    That reminds me that this paper discusses it (one of the first times I've seen it discussed):
    I think the criteria in Fukuda et al. were designed with this sort of scenario in mind but I'm concerned researchers don't necessarily use it that way. Also all the statements "CFS is not improved by rest" by the Fukuda definition must confuse some readers of research papers.
     
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  9. Esther12

    Esther12 Senior Member

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    Thanks for pulling that out.

    Yes - that's what I think too. Intended as a way to exclude those suffering from chronic fatigue related to doing lots of work, but now seemingly open to misinterpretation. It is poorly phrased. Benefiting from rest after 10 minutes of cleaning is a bit different to being able to recover as a result of working over-time less often.
     
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  10. TiredSam

    TiredSam The wise nematode hibernates

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    Isn't that completely obvious? A looser definition will include those less impaired and less symptomatic because of the looser definition - how could it be otherwise? Am I missing something?
     
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  11. Sean

    Sean Senior Member

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    Nope, you are not missing anything. This is the sort of nonsense they have built their careers on.
     
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  12. Esther12

    Esther12 Senior Member

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    It's a Jason and Newton collaboration, and generally they don't seem to be pushing for ever looser criteria.
     
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  13. Sean

    Sean Senior Member

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    Oops. Apologies to Jason and Newton, I am getting threads mixed up. :oops:
     

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