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ME/CFS has been officially recognized as a neurological disease for more than 50 years and is considered the most severe form of long Covid - but it remains highly controversial in neurology to this day. In an interview, Charité Professor H. Prüß
explains where his professional association stands and when those affected can hope for therapies
The World Health Organization has listed ME/CFS as a neurological disease since 1969. Nevertheless, the chronic multisystem disease, which often occurs post-virally, is not recognized by all neurologists. The corona pandemic and its long-term consequences have not been able to change this, although ME/CFS is considered a particularly severe form of long Covid. The nature of the syndrome is a matter of difference between psychosomatic and organic disease, the correct diagnosis and therapy - and the question of how many people are actually affected.
What is the position of the German Society of Neurology (DGN) on these questions? RiffReporter spoke to H. Prüß, the spokesperson for the DGN Neuroimmunology Commission. The Charité professor also provides information on the status of his study on a possible therapy method for long Covid and ME/CFS sufferers, immunoadsorption - and promises a new medical guideline.
Mr Prüß, the multisystem disease ME/CFS is highly controversial in neurology: some consider it to be underdiagnosed, others question it fundamentally. Who is right?
In my personal opinion, this disease undoubtedly exists. For example, we know clear risk factors - women with previous mental illnesses, for example, are more likely to develop ME/CFS. There is much to suggest that we are dealing with a disease with its own mechanisms that we just don't yet fully understand.
So why the argument?
Before doctors are convinced of a diagnosis, they always look for a single disease mechanism in their patients for good reason. But we don't have one with ME/CFS. The disease has had a name for 50 years, but we still don't have a biomarker to prove it. The symptoms are so diverse and overlap strongly with other diseases, including many psychological ones. According to an outdated view, some doctors also assume that psychological symptoms are not an organic disease. I see it completely differently, but all of this makes it so difficult. Last but not least, a major problem is that the diagnoses are often made by the patients themselves. This is understandable, because it is of course more pleasant when symptoms are attributed to an external event such as a viral disease. But self-diagnoses dilute the clinical picture considerably. For every person with real ME/CFS, there are probably several who only attribute this diagnosis to themselves.
How many people do you think are actually affected - and how many ME/CFS patients have been added as a result of long Covid?
There is no good survey on this. The figure of 300,000 people is often mentioned. I suspect that only perhaps 20 percent of these, or 60,000 people, actually have ME/CFS. In my view, there is no serious evidence that this number has increased dramatically as a result of the pandemic.
The main symptom of ME/CFS is usually post-exertional malaise (PEM), a deterioration in condition after exertion. Do you agree?
PEM is the main symptom, and patients should be tested for it. If slight exertion leads to disproportionate weakness, this diagnosis is also plausible.
What makes the focus on PEM in neurology so controversial?
Colleagues also see patients who are suspected of having ME/CFS and who come to the clinic for evaluation and report that they can no longer get out of bed. However, during the rounds they never find them in their room because they are downstairs smoking – and if the elevator doesn’t come fast enough, they take the stairs. This is where self-perception and external perception don’t match up. One problem is when doctors generalise such experiences. This does not do justice to the really seriously ill patients who spend most of the day in bed. In addition, fatigue – one of the most common symptoms of ME/CFS – is also widespread in the healthy normal population. It affects up to ten percent of people, and at a level of severity similar to ME/CFS. It is therefore not always easy to recognise what is special about it compared to other illnesses
Some neurologists generally classify ME/CFS patients as psychosomatic and suspect that they are more likely to have depression. What is the DGN's view on this?
The DGN is divided on this. Psychological comorbidities are common, but I see organic involvement in some patients. In another part, perhaps the larger part, the psychosomatic is actually in the foreground - and that does not mean that these people do not suffer. We know this from children who develop stomach aches because they are afraid of school. These complaints are real, and yet they can of course disappear. That is why we should also examine ME/CFS patients psychosomatically without exception, because if they are mentally ill, we can already help them well. However, we prevent this approach if we work with blood dialysis or oxygen therapy instead.
Will this be the first time there will be an independent ME/CFS guideline?
It will probably be a fatigue guideline with special consideration of ME/CFS - that is part of the compromise. To be honest, we hardly have any concrete recommendations for ME/CFS. Of course it will be about "pacing" [a form of energy management recommended for ME/CFS patients; editor's note], but that essentially just means that a patient does not overexert themselves if it is not good for them. That is actually common sense. The most important thing is that all patients are given an interdisciplinary organic and psychological assessment.
Critical voices criticize the state funding of long Covid and ME/CFS research, and believe that public money would be better invested elsewhere. What do you think of that?
There is broad agreement within the DGN that more research is necessary. The fact that there are other voices calling for this is linked to this diffuse mood: there are numerous patients, you can't really help them, there isn't enough time for a comprehensive organic and psychological assessment. At the same time, there are many mentally ill people who are not cared for because they can't find a psychotherapist. All of this is unsatisfactory and some contributions are perhaps also an expression of helplessness.
You are involved in clinical studies on immunoadsorption, a blood washing procedure that filters autoantibodies from the blood and could help long-Covid and ME/CFS patients. What can you tell us about the results so far?
So far, I can only say that we are making technical progress. The study is extremely complex, double-blind and with a sham treatment in the control group. It will take us until the end of 2024 to include all patients. Then we will start evaluating the results as quickly as possible.
The attention given to long Covid has recently enabled a number of clinical trials that should also benefit ME/CFS sufferers. Can you give them hope that there will be a curative therapy in the near future?
Unfortunately, there is definitely no curative therapy - there is no such thing for almost any chronic disease. However, there should be treatments within the next five years that will help some patients a lot. I also expect that we will make progress through better interdisciplinary assessment. We will have a better understanding of what triggers ME/CFS, and studies are underway, for example, for a vaccine against the Epstein-Barr virus that may be able to prevent ME/CFS in the future. I also hope that in the future it will no longer be a red flag when we tell a patient that psychological factors play a role. Then more sufferers will benefit from psychiatric or psychotherapeutic intervention, whether pharmacological or with talk therapy. So far, this is not even offered to most ME/CFS patients, although there is still evidence for the slightly positive effects of behavioral therapy
Patients complain about a poor care situation: They can hardly find any doctors who are familiar with ME/CFS - and because nothing can be proven with standard diagnostics, they often receive an incorrect psychological diagnosis. Some doctors also warn against such misdiagnoses. Does the DGN agree?
There is no majority opinion of the DGN so far. Most would probably agree that there is a risk of misdiagnosis - in both directions. We have patients with ME/CFS who are diagnosed with depression. They are then sent to an activating rehabilitation program in the assumption that warm baths and physiotherapy will get them better - and then they completely collapse. However, I suspect that even more people with an adjustment disorder, personality disorder or another mental illness are misdiagnosed with ME/CFS. If you tell them not to overexert themselves and do not offer psychotherapy, you are doing them just as much harm. That is the big problem: At the moment we are not really helping those who are suffering severely from ME/CFS - or those who wrongly believe that they have ME/CFS.
On behalf of the federal government, the Institute for Quality and Efficiency in Health Care (IQWiG) analyzed the knowledge on ME/CFS. It came to the conclusion that there is no evidence of the benefit of activating therapies, as they are often used in rehabilitation - but that a deterioration in the condition cannot be ruled out. Some therapists therefore demand: no rehabilitation if PEM is diagnosed. Do you agree?
If PEM can be objectified through behavioral observation and is not based exclusively on self-perception, I agree. Of course, the vivid individual cases of people who come out of rehabilitation in a wheelchair are anything but representative. But if PEM is clearly diagnosed, people cannot be forced into rehabilitation that relies on physical activation. Otherwise they will suffer a setback.
Federal Health Minister Karl Lauterbach wants to make it easier for people with long-term Covid to access therapies that have so far only been sufficiently researched and approved for other diseases. Should there also be such an off-label list for people who have ME/CFS independently of corona?
That is a good idea - but it would be a Herculean task to compile the list. We just don't have the evidence yet. Of course, there are not only quacks who want to make money with expensive therapy offers, but also doctors who are convinced of experimental therapies for ME/CFS and report good experiences. But if their patients experience improvements, it is not possible to check whether these have occurred spontaneously or are due to therapy. What appears to help individuals cannot therefore be generalized without accepting that it may harm others. I fear that patients and doctors have to endure this dilemma. At the moment they can only try something out in specific constellations in individual cases. If you search the internet, you will find an endless number of tips for ME/CFS: cold showers - warm showers, eating this - definitely not that, dialysis, cortisone and much, much more. If there are so many different tips, unfortunately there is some evidence to suggest that none of them work in the long term.