Chronic unexplained fatigue

Comment on: Chronic unexplained fatigue. [Postgrad Med J. 2002]

 

I found the editorial on chronic fatigue syndrome by White both surprising and disappointing, because he used the title “Chronic unexplained fatigue” and the subtitle “A riddle wrapped in a mystery inside an enigma”, but his editorial, by ignoring very important facts about chronic fatigue syndrome, actually perpetuates that riddle, rather than helping to solve it.

If a puzzling and poorly manageable condition shares more than 40 features, including all of its diagnostic criteria, with a well known and easily treatable disease, this astounding clinical overlap should not be ignored, because reason not only suggests that the mysterious illness may simply be a form of the well known disease, but also hints that it is worthwhile assessing whether the classic therapy for that treatable disease could be effective for the enigmatic condition as well.

You can read the rest of this comment here: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1757928/pdf/v078p00763a.pdf

 

Source: Baschetti R. Chronic unexplained fatigue. Postgrad Med J. 2002 Dec;78(926):763; author reply 763. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1757928/pdf/v078p00763a.pdf

 

An occupational therapy approach to persons with chronic fatigue syndrome: part two, assessment and intervention

Abstract:

Chronic Fatigue Syndrome (CFS) is a highly disabling condition that significantly interferes with occupational life. Occupational therapy services are very relevant for this population. Yet, information about the assessment and treatment of CFS is almost absent from occupational therapy literature. As a result, few occupational therapists possess expertise in evaluating and providing therapy for this complex condition. This paper describes an approach to evaluating and providing services for individuals with CFS according to the Model of Human Occupation. This model offers an integrative means of understanding the synergistic and evolving relationships between motivation, values, roles, habits, functional capabilities, and the environment as they influence individuals with CFS, and it provides a framework for the types of changes required in these different domains during the rehabilitation process. A case study illustrates recommended assessment and intervention approaches.

 

Source: Taylor RR, Kielhofner GW. An occupational therapy approach to persons with chronic fatigue syndrome: part two, assessment and intervention. Occup Ther Health Care. 2003;17(2):63-87. doi: 10.1080/J003v17n02_05. http://www.ncbi.nlm.nih.gov/pubmed/23944638

 

An approach to persons with chronic fatigue syndrome based on the model of human occupation: part one, impact on occupational performance and participation

Abstract:

Chronic fatigue syndrome (CFS) is a prevalent and disabling condition that involves six or more months of unexplained fatigue severe enough to interfere with previous levels of occupational, educational, and/or social performance. The fatigue is accompanied by at least four of eight additional physical and cognitive symptoms (Fukuda et al., 1994). This paper conceptualizes the multiple factors that affect occupational adaptation in persons with CFS. The Model of Human Occupation (MOHO) if used as a framework for understanding the synergistic and evolving relationships between motivation, roles, habits, performance capacities, and the environment as they influence individuals with CFS. Examples from the literature, autobiographical accounts, and from practice experience are used to illustrate the experience and impact of CFS on everyday life.

 

Source: Taylor RR, Kielhofner GW, Abelenda J, Colantuono K, Fong T, Heredia R, Kulkarni S, Vazquez E. An approach to persons with chronic fatigue syndrome based on the model of human occupation: part one, impact on occupational performance and participation. Occup Ther Health Care. 2003;17(2):47-61. doi: 10.1080/J003v17n02_04. http://www.ncbi.nlm.nih.gov/pubmed/23944637

 

Analysis of 16S rRNA gene sequences and circulating cell-free DNA from plasma of chronic fatigue syndrome and non-fatigued subjects

Abstract:

BACKGROUND: The association of an infectious agent with chronic fatigue syndrome (CFS) has been difficult and is further complicated by the lack of a known lesion or diseased tissue. Cell-free plasma DNA could serve as a sentinel of infection and disease occurring throughout the body. This type of systemic sample coupled with broad-range amplification of bacterial sequences was used to determine whether a bacterial pathogen was associated with CFS. Plasma DNA from 34 CFS and 55 non-fatigued subjects was assessed to determine plasma DNA concentration and the presence of bacterial 16S ribosomal DNA (rDNA) sequences.

RESULTS: DNA was isolated from 81 (91%) of 89 plasma samples. The 55 non-fatigued subjects had higher plasma DNA concentrations than those with CFS (average 151 versus 91 ng) and more CFS subjects (6/34, 18%) had no detectable plasma DNA than non-fatigued subjects (2/55, 4%), but these differences were not significant. Bacterial sequences were detected in 23 (26%) of 89. Only 4 (14%) CFS subjects had 16S rDNA sequences amplified from plasma compared with 17 (32%) of the non-fatigued (P = 0.03). All but 1 of the 23 16S rDNA amplicon-positive subjects had five or more unique sequences present.

CONCLUSIONS: CFS subjects had slightly lower concentrations or no detectable plasma DNA than non-fatigued subjects. There was a diverse array of 16S rDNA sequences in plasma DNA from both CFS and non-fatigued subjects. There were no unique, previously uncharacterized or predominant 16S rDNA sequences in either CFS or non-fatigued subjects.

 

Source: Vernon SD, Shukla SK, Conradt J, Unger ER, Reeves WC. Analysis of 16S rRNA gene sequences and circulating cell-free DNA from plasma of chronic fatigue syndrome and non-fatigued subjects. BMC Microbiol. 2002 Dec 23;2:39. Epub 2002 Dec 23. http://www.ncbi.nlm.nih.gov/pubmed/12498618

 

Interventions for the treatment and management of chronic fatigue syndrome/myalgic encephalomyelitis

This article summarises the research evidence presented in a recent issue of Effective Health Care on interventions for the treatment and management of chronic fatigue syndrome/ myalgic encephalomyelitis (CFS/ME). It provides an overview of the evidence from a systematic review of randomised controlled trials commissioned by the Department of Health. The results of the systematic review were found to be similar to those of another systematic review carried out in the USA at the same time, and the two have been combined and published together in 2001.

You can read the rest of this article here: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1743629/pdf/v011p00284.pdf

 

Source: Bagnall AM, Whiting P, Richardson R, Sowden AJ. Interventions for the treatment and management of chronic fatigue syndrome/myalgic encephalomyelitis. Qual Saf Health Care. 2002 Sep;11(3):284-8. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1743629/pdf/v011p00284.pdf (Full article)

 

Chronic fatigue syndrome: what role does the autonomic nervous system play in the pathophysiology of this complex illness?

Abstract:

Chronic fatigue syndrome (CFS) is a serious health concern affecting over 800000 Americans of all ages, races and socioeconomic groups and both genders. The etiology and pathophysiology of CFS are unknown, yet studies have suggested an involvement of the autonomic nervous system (ANS). A symposium was organized in December 2000 to explore the possibility of an association between ANS dysfunction and CFS, with special emphasis on the interactions between ANS dysfunction and other abnormalities noted in the immune and endocrine systems of individuals with CFS. This paper represents the consensus of the panel of experts who participated in this meeting.

Copyright 2002 S. Karger AG, Basel

 

Source: Gerrity TR, Bates J, Bell DS, Chrousos G, Furst G, Hedrick T, Hurwitz B, Kula RW, Levine SM, Moore RC, Schondorf R. Chronic fatigue syndrome: what role does the autonomic nervous system play in the pathophysiology of this complex illness? Neuroimmunomodulation. 2002-2003;10(3):134-41. http://www.ncbi.nlm.nih.gov/pubmed/12481153

 

Psychological correlates of functional status in chronic fatigue syndrome

Abstract:

BACKGROUND: The present study was designed to test a cognitive model of impairment in chronic fatigue syndrome (CFS) in which disability is a function of severity of fatigue and depressive symptoms, generalized somatic symptom attributions and generalized illness worry.

METHODS: We compared 45 CFS and 40 multiple sclerosis (MS) outpatients on measures of functional ability, fatigue severity, depressive symptoms, somatic symptom attribution and illness worry.

RESULTS: The results confirmed previous findings of lower levels of functional status and greater fatigue among CFS patients compared to a group of patients with MS. Fatigue severity was found to be a significant predictor of physical functioning but not of psychosocial functioning in both groups. In CFS, when level of fatigue was controlled, making more somatic attributions was associated with worse physical functioning, and both illness worry and depressive symptoms were associated with worse psychosocial functioning.

CONCLUSIONS: Our findings support the role of depression and illness cognitions in disability in CFS sufferers. Different cognitive factors account for physical and psychosocial disability in CFS and MS. The SF-36 may be sensitive to symptom attributions, suggesting caution in its interpretation when used with patients with ill-defined medical conditions.

 

Source: Taillefer SS, Kirmayer LJ, Robbins JM, Lasry JC. Psychological correlates of functional status in chronic fatigue syndrome. J Psychosom Res. 2002 Dec;53(6):1097-106. http://www.ncbi.nlm.nih.gov/pubmed/12479992

 

The prevalence of chronic fatigue syndrome in Iceland – a national comparison by gender drawing on four different criteria

Erratum in: The prevalence of chronic fatigue syndrome in Iceland–a national comparison by gender drawing on four different criteria. [Nord J Psychiatry. 2006]

 

Abstract:

The study was carried out to estimate the prevalence of chronic fatigue syndrome (CFS) in Iceland. No previous prevalence studies known to us have been undertaken in Iceland or in Scandinavia. A 95-item custom-made questionnaire was sent to 4000 randomly selected people. The response rate was 63%. The questionnaire was constructed to include questions on all the items found in the four most common criteria for diagnosing CFS; the criteria being Australian, British and American.

Results show very different prevalences according to the criteria used. The prevalence ranged from 0 to 4.9%, with the most established criteria yielding a prevalence of 1.4%. Re-test validity of the questionnaire was good, the following results are based on the selection criteria by Fukuda et al. (Fukuda K, Straus SE, Hickie I, Sharpe MC, Dobbins JG, Komaroff A, et al. The chronic fatigue syndrome: a comprehensive approach to its definition and study. Ann Int Med 1994;121:953-9).

Women were in a majority (78%); their mean age was 44, they were fully employed and worked long hours. They believed that the onset of their symptoms was stress related. The type of work was unskilled in the majority of cases. A significant proportion of the males felt a constant buzzing in their ears (P < 0.05). Food suppliants were used daily by significantly more women than men (P < 0.01). Men had more frequently phobic symptoms (P < 0.001) than did women. Differences were found in the prevalence of phobia and panic (P < 0.001) between women in the CFS group compared to healthy ones. A positive correlation was found in the prevalence of phobia between women in the CFS group and those with Iceland Disease.

Comment in: The prevalence of chronic fatigue syndrome in Iceland–a national comparison by gender drawing on four different criteria. [Nord J Psychiatry. 2006]

 

Source: Líndal E, Stefánsson JG, Bergmann S. The prevalence of chronic fatigue syndrome in Iceland – a national comparison by gender drawing on four different criteria. Nord J Psychiatry. 2002;56(4):273-7. http://www.ncbi.nlm.nih.gov/pubmed/12470318

 

Relationship between chronic fatigue and subjective symptoms of fatigue with performance status (P.S.) and subjective fatigue scale for young adults (SFS-Y)

Abstract:

OBJECTIVE: Today, fatigue complaints in adolescence are regarded as an issue for young adults as they may progress to the chronic fatigue syndrome. The purpose of this study was to examine the relationships between chronic fatigue based on self-reported performance states (P.S.) and subjective symptoms of fatigue assessed with a fatigue scale for young adults (SFS-Y).

METHOD: The SFS-Y consisted of 24 item questions represonting 6 sub-scales, for difficulty in concentrated thinking, languor, reduced activation, reduced motivation, drowsiness and feeling of physical disintegration. The SFS-Y and for assessing fatigue symptoms and P.S. for chronic fatigue were administered to 548 male and female students aged 15-18 yr and to 608 male students aged 16-18 yr, respectively. Discriminant analysis and a logistic analysis model were employed to define the relevance of subjective symptoms of fatigue to chronic fatigue.

RESULTS: It was determined that the SFS-Y can discliminate P.S. with high probability (74.0-81.4%), with accuracy beyond a fixed level. In particular, the correlation with “difficulty in concentrated thinking” was high.

CONCLUSION: It was judged that the SFS-Y is effective as an index for discrimination of chronic fatigue in young adults with a particularly high relationship between “difficulty in centrated thinking” and chronic fatigue.

 

Source: Kobayashi H, Demura S. Relationship between chronic fatigue and subjective symptoms of fatigue with performance status (P.S.) and subjective fatigue scale for young adults (SFS-Y). Nihon Koshu Eisei Zasshi. 2002 Oct;49(10):1062-9. [Article in Japanese] http://www.ncbi.nlm.nih.gov/pubmed/12462040

 

Hypothalamic-pituitary-adrenal axis reactivity in chronic fatigue syndrome and health under psychological, physiological, and pharmacological stimulation

Abstract:

OBJECTIVES: Subtle alterations of the hypothalamic-pituitary-adrenal (HPA) axis in chronic fatigue syndrome (CFS) have been proposed as a shared pathway linking numerous etiological and perpetuating processes with symptoms and observed physiological abnormalities. Because the HPA axis is involved in the adaptive responses to stress and CFS patients experience a worsening of symptoms after physical and psychological stress, we tested HPA axis functioning with three centrally acting stress tests.

METHODS: We used two procedures mimicking real-life stressors and compared them with a standardized pharmacological neuroendocrine challenge test. CFS patients were compared with healthy control subjects regarding their cardiovascular and endocrine reactivity in a psychosocial stress test and a standardized exercise test, and their endocrine response in the insulin tolerance test (ITT).

RESULTS: Controlling for possible confounding variables, we found significantly lower ACTH response levels in the psychosocial stress test and the exercise test, and significantly lower ACTH responses in the ITT, with no differences in plasma total cortisol responses. Also, salivary-free cortisol responses did not differ between the groups in the psychosocial stress test and the exercise test but were significantly higher for the CFS patients in the ITT. In all tests CFS patients had significantly reduced baseline ACTH levels.

CONCLUSIONS: These results suggest that CFS patients are capable of mounting a sufficient cortisol response under different types of stress but that on a central level subtle dysregulations of the HPA axis exist.

 

Source: Gaab J, Hüster D, Peisen R, Engert V, Heitz V, Schad T, Schürmeyer TH, Ehlert U. Hypothalamic-pituitary-adrenal axis reactivity in chronic fatigue syndrome and health under psychological, physiological, and pharmacological stimulation. Psychosom Med. 2002 Nov-Dec;64(6):951-62. http://www.ncbi.nlm.nih.gov/pubmed/12461200