@Grigor, you are perhaps the most well known patient advocate in the Netherlands so I think you should be well aware of these issues and the very hefty problems that may follow from this decision in the long-term given the historic precedent we have already seen occurring over and over again.
CPETs and tilt table tests have an extremely questionable validity in seperating ME/CFS from well-matched controls on a population level basis. This has been discussed at depth on this forum and has been written about in for example https://mecfsscience.org/discrepancies-in-2-day-exercise-studies/ and https://mecfsscience.org/the-problems-with-pots/. Whilst we can discuss the evidence and p-values on a population level back back and forth, what is extremely and undoubtedly clear is that they have absolutely no validity in determining illness status and disability at the individual level as there is an extreme lack of separation between the groups. Take for example the tilt-table results of from the NIH intramural study (the study can be seen as problematic from different view points, but this part of the study is spot-on but you can also look at other well-matched studies if you want to). The tilt-table test results of the different group look basically identically (the same applies to the CPET results when confounders are accounted for) and provide absolutely no way on how to predict which person lies in which group and that despite ME/CFS patients describing to be heavily disabled by orthostatic intolerance whilst all healthy controls don’t experience any disability. They are all heavily disabled but look no different to their matched healthy counterparts on the tests!
Why does this matter? Well first of all it has no scientific validity. Secondly this can easily backfire. You can have ME/CFS patients being denied disability benefits on the basis of something that has no scientific merits on determining their disability (but I don’t see this as a major worry because the people ordering these tests tend to make a living from providing positive test results). The much larger worry are timelines as the following:
CPETs and tilt table tests have an extremely questionable validity in seperating ME/CFS from well-matched controls on a population level basis. This has been discussed at depth on this forum and has been written about in for example https://mecfsscience.org/discrepancies-in-2-day-exercise-studies/ and https://mecfsscience.org/the-problems-with-pots/. Whilst we can discuss the evidence and p-values on a population level back back and forth, what is extremely and undoubtedly clear is that they have absolutely no validity in determining illness status and disability at the individual level as there is an extreme lack of separation between the groups. Take for example the tilt-table results of from the NIH intramural study (the study can be seen as problematic from different view points, but this part of the study is spot-on but you can also look at other well-matched studies if you want to). The tilt-table test results of the different group look basically identically (the same applies to the CPET results when confounders are accounted for) and provide absolutely no way on how to predict which person lies in which group and that despite ME/CFS patients describing to be heavily disabled by orthostatic intolerance whilst all healthy controls don’t experience any disability. They are all heavily disabled but look no different to their matched healthy counterparts on the tests!
Why does this matter? Well first of all it has no scientific validity. Secondly this can easily backfire. You can have ME/CFS patients being denied disability benefits on the basis of something that has no scientific merits on determining their disability (but I don’t see this as a major worry because the people ordering these tests tend to make a living from providing positive test results). The much larger worry are timelines as the following:
- You have a healthy investigative journalist (or someone else hired by the UWV) report with faked symptoms, go do these tests, inevitable get a positive result precisely because these tests have no validity in determining ME/CFS status on the individual level and then write a story about how “ME/CFS is a fake illness with fake tests that is costing taxpayers millions”
- If I was the UWV I would do exactly the above (for example in form of an insurance investigator which they are known to use in such situations), which they have done in comparable situations, which in the worst case not only questions the validity of ME/CFS but may even lead to questioning the existing benefits people will then have received on the basis of such tests
- You can have a patient that is ill for some months does such a test ends up on benefits on the basis of these tests and then goes to the public and tells everyone how it’s all psychological or fake. Seems ridiculous? This is exactly what we’ve already seen happen over and over. In Long-Covid and ME/CFS a problematic narrative has arisen because Paul Garner was presumably ill and subsequently recovered and has used that as a way to discredit the concept of ME/CFS and Long-Covid with a strong recommendation towards CBT and GET. Eventually the same might occur here.
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