Abstract:
Unexplained fatigue is not infrequent in the community. It presents a number of challenges to the primary care physician and particularly if the clinical examination and routine investigations are normal. However, while fatigue is a feature of many common illnesses, it is the main problem in Chronic Fatigue Syndrome/Myalgic Encephalomyelitis (CFS/ME). This is a poorly understood condition that is accompanied by several additional symptoms which suggest a subtle multisystem dysfunction. Not infrequently it is complicated by sleep disturbance and alterations in attention, memory and mood.
Specialised services for the diagnosis and management of CFS/ME are markedly deficient in the UK and indeed in virtually all countries around the world. However, unexplained fatigue and CFS/ME may be confidently diagnosed on the basis of specific clinical criteria combined with the normality of routine blood tests. The latter include those that assess inflammation, autoimmunity, endocrine dysfunction and gluten sensitivity. Early diagnosis and intervention in general practice will do much to reduce patient anxiety, encourage improvement and prevent expensive unnecessary investigations.
There is presently an on-going debate as to the precise criteria that best confirms CFS/ME to the exclusion of other medical and psychiatric/psychological causes of chronic fatigue. There is also some disagreement as to best means of investigating and managing this very challenging condition. Uncertainty here can contribute to patient stress which in some individuals can perpetuate and aggravate symptoms. A simple clinical scoring system and a short list of routine investigations should help discriminate CFS/ME from other causes of continued fatigue.
Source: Bansal AS. Investigating unexplained fatigue in general practice with a particular focus on CFS/ME. BMC Fam Pract. 2016 Jul 19;17:81. doi: 10.1186/s12875-016-0493-0. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4950776/ (Full article)
Comments
Ellen M Goudsmit 2016 Jul 24 07:44 a.m.
I am not persuaded that ME, as described by clinicians and researchers prior to 1988, has much to do with neurasthenia. Indeed, fatigue was not a criterion for the diagnosis of ME [1]. It presents as a more neurological disorder, e.g. muscle weakness after minimal exertion. References to CFS/ME are misleading where research used criteria for chronic fatigue or CFS, rather than ME. The assumption of equivalence has been tested and the differences are of clinical significance.
A useful strategy to avoid post-exertion related exacerbations is pacing [2]. I missed a reference.
1 Goudsmit, EM, Shepherd, C., Dancey, CP and Howes, S. ME: Chronic fatigue syndrome or a distinct clinical entity? Health Psychology Update, 2009, 18, 1, 26-33. http://www.bpsshop.org.uk/Health-Psychology-Update-Vol-18-No-1-2009-P797.aspx
2 Goudsmit, EM., Jason, LA, Nijs, J and Wallman, KE. Pacing as a strategy to improve energy management in myalgic encephalomyelitis/chronic fatigue syndrome: A consensus document. Disability and Rehabilitation, 2012, 34, 13, 1140-1147. doi: 10.3109/09638288.2011.635746.
Tom Kindlon 2016 Jul 21 8:49 p.m.
Some information on an unpublished study on pupil responses:
Dr Bansal mentions he has observed unusual responses by the pupils to light. I thought I would highlight a study that was done in the late 1990s looking at this. Unfortunately the researcher passed away before it could be published. Perhaps there are better sources than these lay articles but I thought they might be of some use in the hope that the finding might be followed up again.
Eye test hope for ME sufferers
Jenny Hope
A new eye test can ‘see’ changes in the brain triggered by the crippling disease ME. The advance comes from a number of research projects that could lead to better treatments for the illness once ridiculed as ‘yuppie flu’.
It gives fresh hope to an estimated 150,000 victims of chronic fatigue syndrome, which can leave those worst affected bedridden with pain, suffering short-term memory loss and unable to walk even short distances.
Scientists at the Royal Free Hospital and the City University in London have found a way to measure changes in the eyes of ME patients which may show they lack an important brain chemical.
A study by Dr Ian James and Professor John Barbur checked the pupils of 16 ME patients and 24 healthy individuals, using a computer to measure changes identified between the two groups.
They found patients with chronic fatigue had larger pupils and also had a stronger reaction to light and other stimuli. The changes could be linked to a deficiency of the brain chemical serotonin, which is known to occur in ME and is also linked to depression.
Professor John Hughes, chairman of the Chronic Fatigue Syndrome Research Foundation, said the research should make it possible to understand changes occurring in the brain of a sufferer.
This could help those studying the effect of different drugs and possibly help doctors diagnose CFS, he added.
At present there are no reliable tests, although a checklist of symptoms developed five years ago is being used by doctors worldwide.
BREAKTHROUGH FOR ME by Geraint Jones
For years, ME has been treated with suspicion by doctors. Many believe that for every genuine sufferer there is another who simply believes himself to be ill. Experts cannot agree on whether the condition is a physical illness or a psychological disorder which exists only in the victim’s mind. One reason for this scepticism is that, as yet, no one has been able to provide an accurate diagnosis for ME, or myalgic encephalomyelitis, which is known to affect 150,000 people in Britain. There is no known cure and treatment is often based on antidepressant drugs like Prozae, with limited success.
All this may be about to change. Dr Ian James, consultant and reader in clinical pharmacology at London’s Royal Free Hospital School of Medicine, believes that he has found a way of diagnosing the chronic fatigue syndrome and hopes to use it to develop a treatment programme. The breakthrough came after months of research spearheaded by Dr James and Professor John Barbur of London’s City University. It centres round the discovery that the eyes of ME sufferers respond to light and motion stimuli in an unusual way.
“Several doctors treating ME patients noticed that they showed an abnormal pupil response”, says Dr James. “When the pupil is subjected to changes in light, or is required to alter focus from a close object to one further away, it does so by constricting and dilating. ME patients’ eyes do this as well but there is an initial period of instability when the pupil fluctuates in size”.
Using a computerised “pupilometer”, which precisely measures eye responses, Dr James embarked on a detailed study of this phenomenon on ME patients, using non-sufferers as a control. A variety of shapes were flashed on to a screen and moved across it, while a computer precisely measured pupil reflex to each of the 40 tests. Results confirmed that the pupil fluctuation was peculiar to those participants who suffered from ME.
Dr James concluded that the abnormal pupil response is a result of some kind of interference in the transfer of impulses from the brain to the eye. He believes that ME is the result of a deficiency of a neuro-transmitter called 5HT, whose job it is to pass impulses through nerves to cells. The eyes of ME sufferers treated with 5HT behave normally. “I do not yet know how the ME virus causes abnormalities in 5HT transmission but it does inhibit its function”, says Dr James.