Natural course of chronic disabling fatigue in adolescents

Research abstract

Objective:   Little is known about persistence of or recovery from chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME) in adolescents. Previous studies have small sample sizes, short follow-up or have focused on fatigue rather than CFS/ME or, equivalently, chronic fatigue, which is disabling. This work aimed to describe the epidemiology and natural course of CFS/ME in adolescents aged 13–18 years.

Design:   Longitudinal follow-up of adolescents enrolled in the Avon Longitudinal Study of Parents and Children.

Setting:  Avon, UK.

Participants:   We identified adolescents who had disabling fatigue of >6 months duration without a known cause at ages 13, 16 and 18 years. We use the term ‘chronic disabling fatigue’ (CDF) because CFS/ME was not verified by clinical diagnosis. We used multiple imputation to obtain unbiased estimates of prevalence and persistence.

Results:   The estimated prevalence of CDF was 1.47% (95% CI 1.05% to 1.89%) at age 13, 2.22% (1.67% to 2.78%) at age 16 and 2.99% (2.24% to 3.75%) at age 18. Among adolescents with CDF of 6 months duration at 13 years 75.3% (64.0% to 86.6%) were not classified as such at age 16.

Similar change was observed between 16 and 18 years (75.0% (62.8% to 87.2%)). Of those with CDF at age 13, 8.02% (0.61% to 15.4%) presented with CDF throughout the duration of adolescence.

Conclusions:  The prevalence of CDF lasting 6 months or longer (a proxy for clinically diagnosed CFS/ME) increases from 13 to 18 years. However, persistent CDF is rare in adolescents, with approximately 75% recovering after 2–3 years.

What is already known on this topic?

Chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME) is relatively common and disabling in children and adolescents. Previous studies (typically with small samples) have reported inconsistent estimates of persistence of CFS/ME during adolescence. The long-term prognosis of the condition in those not receiving treatment is not known.

What this study adds?

The prevalence of chronic disabling fatigue (CDF), a proxy for clinically diagnosed CFS/ME, increases during adolescence.

Approximately 25% persist over a 2–3-year follow-up. Only 8% of children with CDF at age 13 had CDF at 16 and 18 years.

Natural course of chronic fatigue syndrome/myalgic encephalomyelitis in adolescents, by Tom Norris, Simon M Collin, Kate Tilling, Roberto Nuevo, Stephen A Stansfeld, Jonathan AC Sterne, Jon Heron, Esther Crawley in Arch Dis Child [Published Online 19 January 2017]

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What happens when you have a disease doctors can’t diagnose

TED Summit video, filmed June 2016, of a talk by film maker Jennifer Brea: What happens when you have a disease doctors can’t diagnose  January 2017


Five years ago, American Jennifer Brea became progressively ill with myalgic encephalomyelitis, a debilitating illness that severely impairs normal activities and on bad days makes even the rustling of bed sheets unbearable.

In this poignant talk, Brea describes the obstacles she’s encountered in seeking treatment for her condition, whose root causes and physical effects we don’t fully understand, as well as her mission to document through film the lives of patients that medicine struggles to treat.

She also highlights the attitudes that have caused many medical conditions over the years to have been classified as psychological, thus delaying scientific research and the search for a cure.

Watch the video [17 mins]

Jennifer Brea’s website           Meet the artist video

Her film Unrest, previously Canary in a coal mine, will premiere in the documentary competition at the 2017 Sundance Film Festival.

ParkRecord blog post by Frances Moody, 17 January: ‘Unrest’ documents lives of ME patients       The documentary shows the struggle of those who suffer from ME or CFS

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Life stories & photo-elicited diaries of people with severe ME/CFS

Thesis abstract:

Myalgic Encephalomyelitis (ME) remains a controversial disease, shrouded in medical and social uncertainty. This thesis examines connections between language, space and representations of becoming diagnosed and living with the often severe effects of this chronic illness.

Dominant medical and political institutions, often successful in funding, hold the power to drive the medical debates surrounding aetiology and treatment. As these institutions govern and wrangle over the ‘making’ of a definable truth, people are living with the ‘reality’ of illness.

In order to address the issues of living with this chronic illness, this thesis examines 9 life stories and 8 subsequent Photo-Elicited Diaries of 2 males and 7 females diagnosed with ME (also known as Chronic Fatigue Syndrome).

This thesis adopts a transdisciplinary approach and employs critical discourse and narrative analyses to both the bio-political and socio-cultural contexts. A kaleidoscopic view was applied to examine the discursive, material and relational aspects of living with a particular chronic illness. This method identified issues of ‘doing’ illness whilst ‘being’ chronically ill.

Taking such an approach exposed the power relations, social practices and subjective experiences of becoming and mastering illness, often within the enclosed  spaces of homes/hospitals and house/bedbound. The findings reflected on the severe effects as a causal agent for displacing personal and social truths, for continually plugging in and out of social worlds and the conditions of possibilities for resisting and surviving chronic illness.

By combining narrative and visual accounts the rich complexities of living with a severe chronic illness could be better explored. This study advocates the benefits of combining spoken and visual experiences of illness for future studies and has the potential to impact approaches employed within the therapeutic setting.

As the house/bedbound tend to remain the missing voices within medical and social research, this study joins an urgent call for research to focus not merely on disability  issues, but impairments and the associated effects – relapsing,  recovering and surviving chronic illness.

ME and its discontents: life stories and photo-elicited diaries of a severe chronic illness, by Sharon Gallagher. MPhil thesis,  University of East London, June 2016

UEL website entry

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ME/CFS presents a medical education challenge in the US

Dr Kenneth Friedman submits evidence to the US Chronic Fatigue Syndrome Advisory Committee (CFSAC) which he hopes will stimulate a long overdue, effective, national ME/CFS Medical Education program:

Introduction:

ME/CFS presents a medical education challenge in the United States.[1]   Perhaps because it is an illness diagnosed by a patient’s report of symptoms, with variable pathophysiological findings among patients, and no known biomarker to support a diagnosis, many healthcare providers doubt a physical basis of the illness. The questioned etiology of ME/CFS in the minds of practicing physicians may discourage the inclusion of ME/CFS in medical school curricula. [2]  But others factors, such as disproportionately lower research funding for this illness,[3] and the majority of research studies being statistically underpowered, [4] make curriculum development difficult.

Recently, the credibility of some published data and their interpretation has been challenged, and the data only opened to public inspection after court order. [5]

The federal government has both directly and indirectly contributed to the lack of medical education and medical education materials.

Read more for details of the history of medical education for ME/CFS in the US.

Download: Meeting the ME/CFS Medical Education Challenge Testimony for the Chronic Fatigue Syndrome Advisory Committee (CFSAC), by Kenneth J. Friedman, Ph.D. January 2017

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Estimating the disease burden of ME/CFS in the US

Article abstract:

At the National Institutes of Health (NIH), burden of disease is an important factor in funding decisions along with such factors as scientific opportunity, the quality of the science, and the interest of researchers.

Recent studies have quantified the burden for a number of diseases in the United States and the NIH has used that information to analyze how its own funding patterns correspond to disease burden. However, the burden of disease has not been quantified for myalgic encephalomyelitis, also called chronic fatigue syndrome (ME/CFS) and is often underestimated due to a lack of research and the misperceptions about the nature of the disease.

Using the limited information in the literature, this paper develops a preliminary estimate of the disease burden of ME/CFS in the United States, using the World Health Organization’s Disability Adjusted Life Years (DALY) measure. The ME/CFS DALY estimate is then compared to the NIH’s 2013 analysis of research funding versus DALY across other funded diseases in order to estimate a level of funding for ME/CFS that would be commensurate with disease burden.

Even given the limitations arising from sparse data, this analysis demonstrates that federal research funding for this disease is far less than what would be expected by the burden of the disease.

We conclude that the annual research funding for ME/CFS would need to increase twenty-five fold or more to be commensurate with disease burden. This level of funding would best leverage the growing interest of researchers and the significant scientific opportunities that exist to understand the pathology of this disease and to advance diagnostics and treatments.

Estimating the disease burden of ME/CFS in the United States and its relation to research funding, by Mary. E. Dimmock, Arthur A. Mirin, Leonard A. Jason in the Journal of Medicine and Therapeutics (new open access journal), 9 December 2016.

See also:

ME Action blog post: Dimmock, Mirin & Jason: Estimating disease-burden in the US

 

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A systematic review of the association between fatigue & genetic polymorphisms

Review abstract:

Fatigue is one of the most common and distressing symptoms, leading to markedly decreased quality of life among a large subset of patients with a variety of disorders. Susceptibility to fatigue may be influenced by genetic factors including single nucleotide polymorphisms (SNPs), especially in the regulatory regions, of relevant genes.

To further investigate the association of SNPs with fatigue in various patient populations, a systematic search was conducted on Pubmed, CINAHL, PsycINFO, and Sociological Abstracts Database for fatigue related-terms in combination with polymorphisms or genetic variation-related terms.

Fifty papers in total met the inclusion and exclusion criteria for this analysis. These 50 papers were further classified into three subgroups for evaluation: chronic fatigue syndrome (CFS), cancer-related fatigue (CRF) and other disease-related fatigue.

SNPs in regulatory pathways of immune and neurotransmitter systems were found to play important roles in the etiologies of CFS, CRF and other disease-related fatigue. Evidence for associations between elevated fatigue and specific polymorphisms in TNFα, IL1b, IL4 and IL6 genes was revealed for all three subgroups of fatigue.

We also found CFS shared a series of polymorphisms in HLA, IFN-γ, 5-HT and NR3C1 genes with other disease-related fatigue, however these SNPs (excluding IFN-γ) were not found to be adequately investigated in CRF. Gaps in knowledge related to fatigue etiology and recommendations for future research are further discussed.

A systematic review of the association between fatigue and genetic polymorphisms, by Wang T, Yin J, Miller AH, Xiao C in Brain Behav Immun. 2017 Jan 12 pii [Epub ahead of print]

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Children’s experiences of CFS/ME

Review abstract:

Objective:
To synthesis the qualitative studies of children’s experiences of chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME).

Design:
Systematic review and meta-ethnography.

Background:
CFS/ME is an important disabling illness, with uncertain cause and prognosis. As a result, children with CFS/ME can find themselves living with greater uncertainty and stigma, exacerbating the impact of the condition. There is a growing body of qualitative research in CFS/ME, yet there has been no attempt to systematically synthesis the studies
involving children.

Methods:
Studies exploring the experiences of children diagnosed with CFS/ME, published or unpublished, using qualitative methods were eligible.  MEDLINE, EMBASE, PsycINFO and CINAHL databases were searched as well as  grey literature, reference lists and contacting authors. Quality assessment was done independently using the Critical Appraisal Skills Programme (CASP) checklist. Studies were synthesised using techniques of meta-ethnography.

Results:
Ten studies involving 82 children with CFS/ME aged 8-18 were included. Our synthesis describes four third-order constructs within children’s experiences: (1) disruption and loss: physical, social and the self; (2) barriers to coping: suspension in uncertainty, problems with diagnosis and disbelief; (3) facilitators to coping: reducing uncertainty,
credible illness narratives, diagnosis and supportive relationships and (4) hope, personal growth and recovery. CFS/ME introduces profound biographical disruption through its effects on children’s ability to socialise, perform school and therefore how they see their future.

Unfamiliarity of the condition, problems with diagnosis and felt stigma prevent children from forming a new illness identity. Children adopt coping strategies such as building credible explanations for their illness.

Conclusions:
Physical, social, emotional and self-dimensions of life should be included when treating and measuring outcomes from healthcare in paediatric CFS/ME. There is a need for greater recognition and diagnosis of childhood CFS/ME, specialist advice on activity management and improved communication between health and education providers to help children cope with their condition.

Strengths and limitations of this study

  • To the best of our knowledge, this is the first systematic review and meta-ethnography of the qualitative literature of children’s experiences of chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME).
  • We included all published and unpublished studies from any language to avoid bias.
  • The synthesis of studies from multiple contexts identified the main dimensions of life impacted, as well as barriers and facilitators to living with childhood CFS/ME.
  • The findings from this synthesis could be used to inform healthcare practice and the development of outcome measures in paediatric CFS/ME.
  • The majority of studies were conducted in western countries reducing the transferability of findings.

Children’s experiences of chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME): A systematic review and meta-ethnography of qualitative studies, by Roxanne M Parslow, Sarah Harris, Jessica Broughton, Adla Alattas, Esther Crawley, Kirstie Haywood, Alison
Shaw in BMJ Open 2017:7

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Discussion of Fluge’s finding of key metabolic enzyme impairment in ME/CFS

TV2 interview with Dr Øystein Fluge on his latest research on ME/CFS – in Norwegian with English subtitles. Begins with a man who is very severely affected by ME.
(11 minutes 23 seconds)    Watch video

 

Medscape Medical news article, 13 January 2017: Possible mechanism identified for ‘Chronic Fatigue Syndrome’, by Miriam E. Tucker 13 January 2017

Blockage of a key metabolic enzyme could explain the profound lack of energy and other symptoms experienced by patients with myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), new research suggests.

The findings were published December 22, 2016, in the Journal of Clinical Investigation Insight by Øystein Fluge, MD, from the Department of Oncology and Medical Physics at Haukeland University Hospital, Bergen, Norway, and colleagues.

The study included 200 patients with ME/CFS, as defined by the 2003 Canadian Consensus Criteria, which requires the hallmark symptom of postexertional malaise, among others, to make the diagnosis of ME/CFS.

The authors compared serum concentrations of 20 standard amino acids from the 200 patients with ME/CFS and 102 healthy control patients.

In the patients with ME/CFS, there was a specific reduction of amino acids that fuel oxidative metabolism, pointing to functional impairment of pyruvate dehydrogenase (PDH), a key enzyme for the conversion of carbohydrates to energy. Impairment of PDH could result in the cells switching to consumption of alternative fuels, causing a sudden shortage of energy in the muscles and a buildup of lactate, experienced by patients as a burning sensation in their muscles after even minor exertion.

“I think that at present our data are primarily telling us something about the ME/CFS disease. Our findings indicate an impaired function of the PDH enzyme complex, resulting in reduced flux of pyruvate to the [tricarboxylic acid (TCA)] cycle. Increased lactic acid accumulates upon limited exertion, and there is a compensatory use of alternative substrates to fuel the TCA cycle. So, the results indicate an impaired mitochondrial PDH complex function, we believe induced by the immune system,” Dr Fluge told Medscape Medical News.

The model, if correct, has implications for prescribing exercise for patients with ME/CFS.

“Based on the findings in the study, we can understand why patients need to stay at rest, minimizing the energy deficiency and reducing the symptoms caused by lactic acid accumulation…. The value of doing exercise should, however, not be underestimated, and the level of activity tolerated will depend on the severity of the disease,” Dr Fluge said.

He added, “An ME/CFS patient’s ability to handle exercise is very individual. Generally, I think the physicians should listen carefully to the patients, and find the optimal activity level through pacing, to avoid ‘crashing’ with the resulting major symptom increase that can last for weeks and months.”

Asked to comment, Anthony L. Komaroff, MD, professor of medicine at Harvard University, Boston, Massachusetts, and editor-in-chief of the Harvard Health Letter, told Medscape Medical News,

“This is the latest of many research studies that are pursuing a simple idea: That the human being who says ‘I don’t have enough energy’ could have a problem with their cells producing enough energy…. It adds to a large literature indicating that cellular energy metabolism is abnormal in patients with ME/CFS.”

However, he cautioned that the investigators inferred the abnormality in PDH, rather than directly measuring it, and that although “[t]heir argument seems plausible…I wouldn’t be convinced until a second study by other investigators, studying other patients with ME/CFS, confirmed this.”

Dr Komaroff also said, “What is urgently needed are some testable hypotheses that would explain the several different reported abnormalities in energy metabolism [in ME/CFS].”

Read more:  the article goes on to discuss the different results found between women and men, and the argument against the involvement of deconditioning in energy impairment.

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Myhill & McLaren-Howard discuss apparent contradictions in mitochondria research

DoctorMyhill.co.uk article, by Dr Sarah Myhill & John Howard-McLaren-Howard, 11 January 2017: Reply to Lawson Paper

Background:

In 2016, Nick Lawson, Chung-Han Hsieh, Dana March, Xinnan Wang published a paper with the title “Elevated Energy Production in Chronic Fatigue Syndrome Patients” in the Journal of Nature and Science (J Nat Sci 2016; 2(10):e221. The full paper can be viewed here:

“Elevated Energy Production in Chronic Fatigue Syndrome Patients” Nick Lawson, Chung-Han Hsieh, Dana March, and Xinnan Wang

At first sight, the conclusions of this paper may seem to be at odds with the three papers that I have co-authored on mitochondrial dysfunction.

Lawson et al conclude that:

“To thoroughly reveal mitochondrial deficiencies in CFS patients, here we examine the key aspects of mitochondrial function in blood cells from a paired CFS patient-control series. Surprisingly, we discover that in patients the ATP levels are higher……”

This compares with the conclusion that Professor Norman E. Booth, Dr John McLaren-Howard and I came to in our first published paper, “Chronic fatigue syndrome and mitochondrial dysfunction”:

“Our observations strongly implicate mitochondrial dysfunction as the immediate cause of CFS symptoms.”

Our first published paper can be found here – “Chronic fatigue syndrome and mitochondrial dysfunction”

This conclusion of impaired energy production in CFS patients was supported by our two subsequent papers which can be found as below:

I explain these ideas in more detail on my webpage – CFS – The Central Cause: Mitochondrial Failure

Explanation of this apparent conflict:

Dr John McLaren-Howard has produced the note below to explain this apparent conflict. The note is reproduced in full with John’s permission.

Full text of John McLaren-Howard note:
On initial perusal of the title, the following paper may initially seem to be a contradiction of our test findings in CFS/ME patients. However, closer examination of the contents of this publication leads to some very important possibilities.

Ref: Nick Lawson, Chung-Han Hsieh, Dana March, Xinnan Wang. Elevated Energy Production in Chronic Fatigue Syndrome Patients. J Nat Sci 2016; 2(10):e221

The authors conclude that CFS/ME patients have higher ATP levels that controls. Their work was done on cultured cells while all of our test data is on the patients’ cells as separated from a whole-blood sample. So why the difference?

About 35% of our abnormal ATP-profiles show chemical blocking of ADP to ATP re-conversion at the translocator (TL) sites of the inner mitochondrial membranes and over 90% show poor ADP to ATP re-conversion even if TL-sites are not apparently blocked. This presumably reflects other problems with the electron-transport chain (oxidative phosphorylation). That could include chemical or metabolic blocking of one-or-more of the enzyme complexes.

If the ATP levels are measured on cultured cells the effect of any blocking agent may be negated. For argument’s sake, let’s take a situation where 20% of the TL sites are blocked by a chemical we will call X. If the cells are cultured the ‘new’ cells will be unaffected by the blocking agent X which is not itself cultured: X probably being an environmental chemical, drug or metabolic biochemical. In our hypothetical example, when in the culture 10 times the original cell number is reached only 2% would be affected by X. When a very moderate amplification of 100 times the cell numbers is reached only 0.2% of the cells would be affected by X etc etc…………

The changes we see in terms of the blocking of TL sites and other chemical interferences are negated when cultured cells are used to assess ATP metabolism in CFS/ME patients. That being the reason why I rejected the use of cultured cells during the development of the ATP-profile performed here.

BUT, this paper does reflect exciting work. It demonstrates the ability of the ‘new’ cells to produce increased levels of ATP. This supports what many doctors have reported to me and what has been my own experience. When steps are taken to eliminate blocking chemicals, whether affecting TL sites or interfering with steps in the electron-transport chain, and/or substrate deficiencies are addressed, there are almost always clinical improvements. These can be dramatic, moderate, but very welcome by the patients, and sometimes only mild. In the latter cases there is clearly more to learn although it often pivots on renewed individual assessment rather than some as yet unknown scientific area.

I am very grateful to the authors of the above paper for their work and contribution although I could wish they had chosen a different title in order to avoid confusion.

If I can find the time I will carry out some comparisons between the ATP in cells directly from CFS patients and in the cultured cells. It would be of even greater value if this was assessed by a third party laboratory.”

Pheonix rising forum post, 21 Oct 2016: Mitochondrial and Energy Metabolism Dysfunction in ME/CFS — Myhill, Booth and McLaren-Howard Papers 

The ME/CFS Energy Metabolism Studies of Dr Sarah Myhill et al – a discussion of the three very incisive studies of Dr Sarah Myhill, Norman E. Booth and John McLaren-Howard (published in 2009, 2012 and 2013) on the dysfunctional energy metabolism of ME/CFS.

  • Dr Sarah Myhill is a GP with a great deal of research interest and expertise in treating ME/CFS.
  • Dr Norman E. Booth is a retired academic physicist with two family members who have been affected by ME/CFS.
  • Dr John McLaren-Howard is cofounder of Biolab Medical Unit, and medical director of Acumen Labs, UK.
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Is mitochondrial function abnormal in ME/CFS?

ME Research UK article, 12 January 2017: Is mitochondrial function abnormal?

Mitochondria are often referred to as the power plants of the body because they are responsible for generating nearly all the energy needed to support life.

These kidney bean-shaped structures are found in most cells and are made up of different compartments, each with a specific role related to the metabolism of the cell they inhabit.

One of these roles is the generation of adenosine triphosphate (ATP), a molecule that is used to transport energy within a cell and thereby enable it to function properly (for example, allowing a muscle fibre to contract).

It is not surprising, therefore, that scientists have considered whether abnormalities in the mitochondria might be involved in ME/CFS, an illness characterised by a loss of muscle power following exertion, which may be due to insufficient energy within the muscle cells.

We have reported on several such studies over the last few years (from the Netherlands, Spain and the UK), but the overall picture is still not clear. Some studies have shown reduced concentrations of ATP in ME/CFS patients, while others have not.

Adding to this story (but not yet making it much clearer) is new research published in the Journal of Nature and Science. US researchers at Stanford and Columbia took blood samples from 42 ME/CFS patients and 42 healthy people in five different clinics, including the Levine Clinic and Sierra Internal Medicine. Their main aim was to look for defects in the structure or function of the mitochondria that might explain some of the symptoms of ME/CFS.

Overall, the researchers found no difference in the density, size or shape of mitochondria in patients, nor in several other aspects of their structure and function, although the cristae (protrusions of the membranes inside the mitochondria) were more condensed than usual.

They did find that ATP levels were higher than normal in the blood samples from ME/CFS patients. Further testing showed that the mitochondrial production of ATP was actually relatively normal, suggesting that the extra ATP was being generated elsewhere.

The main conclusion of the study, however, was that there were no major abnormalities in the mitochondria of ME/CFS patients: the important parts of this structure were all intact and functioning, and ATP production was normal.

It is important to note that these measurements were made in mitochondria from blood cells, and it is possible that the situation in muscle cells is quite different. But at least one study that did look at muscle mitochondria has also reported normal ATP production.

If the muscle fatigue in ME/CFS is not a result of a lack of mitochondrial ATP, then what is the cause? We still don’t know, but the intriguing hypothesis suggested by these researchers is that there is some pathological process occurring by which extra ATP is being produced somewhere else. And the scientists’ next step is to identify where and why this is happening.

 

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