Tag: review

A comparative review of systemic and neurological symptomatology in 12 outbreaks collectively described as chronic fatigue syndrome, epidemic neuromyasthenia, and myalgic encephalomyelitis

Abstract:

Outbreaks of illnesses of unknown etiology typified by a chronic relapsing course of constitutional symptoms and nervous system involvement have collectively been referred to as chronic fatigue syndrome, epidemic neuromyasthenia, and myalgic encephalomyelitis. To examine heterogeneity of clinical presentation, a comparative review was undertaken for 12 well-documented outbreaks reported since 1934.

A systemic syndrome characterized by excessive fatigue, myalgias, headache, low-grade fever, and other constitutional symptoms was common to cases in all outbreaks. However, marked heterogeneity in the range of neurological features was apparent.

On the basis of predominant neurological manifestations, outbreaks could be grouped into four levels of increasing neurological involvement: affective neuropsychological changes (level I); prominent cutaneous sensory symptoms with both affective and cognitive neuropsychological changes (level II); marked objective paresis with cutaneous sensory as well as affective and cognitive neuropsychological changes (level III); and cutaneous sensory, affective and cognitive neuropsychological, posterior column, cranial nerve, and mixed upper and lower motor neuron changes (level IV). Groups with the most prominent objective neurological findings (levels III and IV) comprised exclusively outbreaks reported between the 1930s and 1950s. All but one outbreak in groups with less prominent neurological findings (levels I and II) were reported between the 1960s and 1980s; a range of neurological features was observed for these groups.

Because a complete neurological examination is not emphasized as part of the diagnostic workup in current outbreaks, it is possible that less obvious neurological findings may be overlooked. Careful evaluation of neurological features in epidemic and endemic cases of what is now called chronic fatigue syndrome may be one approach to distinguishing subtypes of what has been described in the past as a nosological entity.

 

Source: Briggs NC, Levine PH. A comparative review of systemic and neurological symptomatology in 12 outbreaks collectively described as chronic fatigue syndrome, epidemic neuromyasthenia, and myalgic encephalomyelitis. Clin Infect Dis. 1994 Jan;18 Suppl 1:S32-42. http://www.ncbi.nlm.nih.gov/pubmed/8148451

 

Viral studies of chronic fatigue syndrome

Abstract:

Chronic fatigue syndrome (CFS) has many characteristics suggesting persistent fatigue following a viral illness. At least nine different RNA and DNA viruses have been considered to be associated with this disease, but none of these viruses has been found to be the etiologic agent. Immunologic studies have demonstrated activated CD8+ cells and reduced function of natural killer cells suggesting a host response to an infection that has led to persistent immune disorders. Some of the symptoms of CFS may be due to cytokines produced by this hyperactive immune response to a virus that is still present in the host or that has been eliminate but leaves abnormal immunologic sequelae. These possibilities offer directions for future studies of CFS and therapeutic approaches to this condition.

 

Source: Levy JA. Viral studies of chronic fatigue syndrome. Clin Infect Dis. 1994 Jan;18 Suppl 1:S117-20. http://www.ncbi.nlm.nih.gov/pubmed/8148437

 

The chronic fatigue syndrome

Abstract:

CFIDS (chronic fatigue and immune disfunction syndrome) is also known as CFS (chronic fatigue syndrome), CEBV (chronic Epstein-Barr virus), M.E. (myalgic encephalomyelitis), yuppie flu and by other names.

It is a complex illness characterized by incapacitating fatigue (experienced as exhaustion and extremely poor stamina), neurological problems and a constellation of symptoms that can resemble many disorders, including; mononucleosis, multiple sclerosis, fibromyalgia, AIDS-related complex (ARC) and autoimmune diseases such as lupus. These symptoms tend to wax and wane, but any often severely debilitating and may last for many months or years. All sections of the population (including children) are at risk, but women under 45 seem to be most susceptible.

The investigators suggest that CFIDS results from dysfunction of the immune system. The exact nature of this dysfunction is not yet well defined, but it can generally be viewed as an unregulated or overactive state which is responsible for most of the symptoms. There is also evidence of some immune suppression in CFIDS. None of the treatments is consistently satisfactory, but some may be helpful: psychotherapy, physiotherapy, exercise programs, acupunctures, small doses of antidepressants, etc.

 

Source: Artsimovich NG, Chugunov VS, Kornev AV, Ivanova TM, Chugunov AV, Oprishchenko MA. The chronic fatigue syndrome. Zh Nevrol Psikhiatr Im S S Korsakova. 1994;94(5):47-50. [Article in Russian] http://www.ncbi.nlm.nih.gov/pubmed/7900453

 

Pathogenic tracks in fatigue syndromes

Abstract:

This review analyses the recent literature devoted to two related fatigue syndromes: chronic fatigue syndrome (CFS) and acute onset postviral fatigue syndrome (PVFS). The articles are grouped into five pathogenic tracks: infectious agents, immune system, skeletic muscle, hypothalamo-pituitary-adrenal (HPA) axis and psychiatric factors.

Although a particular infectious agent is unlikely to be responsible for all CFS cases, evidence is shown that host-parasite relationships are modified in a large proportion of patients with chronic fatigue. Antibody titres against infectious agents are often elevated and replication of several viruses could be increased.

Chronic activation of the immune system is also observed and could be due to the reactivation of persistent or latent infectious agents such as herpes viruses (i.e. HHV-6) or enteroviruses. It could also be favorised by an impaired negative feedback of the HPA axis on the immune system.

A model is proposed where the abnormalities of the HPA axis are primary events and are mainly responsible for a chronic activation of the immune system which in turn induces an increased replication of several viruses under the control of cellular transcription factors. These replicating viruses together with cytokines such as TNF-alpha would secondarily induce functional disorders of muscle and several aspects of asthenia itself.

 

Source: Moutschen M, Triffaux JM, Demonty J, Legros JJ, Lefèbvre PJ. Pathogenic tracks in fatigue syndromes. Acta Clin Belg. 1994;49(6):274-89. http://www.ncbi.nlm.nih.gov/pubmed/7871934

 

Treatment of the chronic fatigue syndrome. A review and practical guide

Abstract:

The chronic fatigue syndrome (CFS) was formally defined in 1988 to describe a syndrome of severe and disabling fatigue of uncertain aetiology associated with a variable number of somatic and/or psychological symptoms. CFS has been reported in most industrialised countries and is most prevalent in women aged between 20 and 50 years.

Despite occasional claims to the contrary, the aetiology of CFS remains elusive. Although abnormalities in tests of immune function and cerebral imaging have been described in variable numbers of CFS patients, such findings have been inconsistent and cannot be relied upon, either to establish or exclude the diagnosis. Thus, diagnosis rests on fulfillment of the Centers for Disease Control case definition which was revised in 1992. This case definition remains somewhat controversial, largely due to its subjectiveness.

The mainstay of treatment is establishing the diagnosis and educating the patient about the illness. An empathetic clinician can stop further consultations elsewhere (‘doctor shopping’) and subsequent excessive investigations, which frequently occur in such patients.

Most patients should undertake a trial of antidepressant therapy, even if major depression is not present. The choice of antidepressant drug should tailor the tolerability profile to relief of particular CFS symptoms, such as insomnia or hypersomnia. Failure to improve within 12 weeks warrants an alternative antidepressant agent of another class. Many other drugs have been reported anecdotally to be beneficial, but no therapy has been demonstrated to be reproducibly useful in double-blind, placebo-controlled clinical trials with an adequate duration of follow-up.

 

Source: Blondel-Hill E, Shafran SD. Treatment of the chronic fatigue syndrome. A review and practical guide. Drugs. 1993 Oct;46(4):639-51. http://www.ncbi.nlm.nih.gov/pubmed/7506650

 

Chronic fatigue syndrome: a critical review

Abstract:

The term “chronic fatigue syndrome” (CFS) applies to a condition of unknown aetiology characterized clinically by an association of subjective symptoms, the most constant being an invalidating tiredness. The diagnostic criteria in current use do not permit to isolate an homogeneous subgroup among patients consulting for chronic asthenia.

In the present state of research no infectious or immunological cause has been demonstrated conclusively, although a persistent enterovirus or herpesvirus type 6 infection or a state of chronic immune activation seem to play a role in some cases. Patients who fulfill the criteria of CFS present with psychiatric overmorbidity, essentially depressive, and in 50% of the cases with the mental disorders preceding CFS. The various theoretical models linking CFS to psychopathology are discussed, and finally the syndrome is regarded as a social construction reproducing or renovating the neurasthenia of the late 19th century.

There is no specific treatment of CFS, but antidepressants, cognitive-behavioural therapy and perhaps certain immuno-modulators can be useful. The future lines of research should endeavour to isolate a subgroup of patients with prolonged asthenia after a recognized episode of infection and to identify the immunological, psychological and behavioral characteristics of this particular group as well as their reciprocal interactions.

 

Source: Cathébras P, Bouchou K, Charmion S, Rousset H. Chronic fatigue syndrome: a critical review. Rev Med Interne. 1993 Apr;14(4):233-42. [Article in French] http://www.ncbi.nlm.nih.gov/pubmed/8378654

 

Chronic fatigue syndrome. A fresh look at an old problem

Abstract:

Chronic fatigue syndrome (CFS), an organic disease of unexplained origin, affects about three people in 100,000. Symptoms last approximately 2 1/2 years, and most CFS patients return to normal health. Diagnosis of CFS is by exclusion. No single remedy has yet proven consistently beneficial. Family physicians can help by providing medical validation of disability to persons who might otherwise be seen as malingerers.

You can read the full article here: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2379748/pdf/canfamphys00108-0118.pdf

 

Comment in: Disagreeing on how to treat CFS patients. [Can Fam Physician. 1993]

 

Source: McSherry J. Chronic fatigue syndrome. A fresh look at an old problem. Can Fam Physician. 1993 Feb;39:336-40. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2379748/

 

Unproven diet therapies in the treatment of the chronic fatigue syndrome

Abstract:

This report is a review of the unproven diet therapies recommended for individuals with chronic fatigue syndrome (CFS). Diet therapies promoted for the relief of CFS symptoms by the authors of five CSF self-help books were evaluated on the basis of nutritional adequacy and scientific rationale.

Unproven diet therapies for patients with CFS include megavitamin/mineral supplements; royal jelly and other dietary supplements; and elimination, avoidance, and rotation diets. Claims that these therapies relieve CFS symptoms and promote recovery are anecdotal and have not been substantiated by clinical research.

The yeast-avoidance and sugar-free diets, both promoted to combat Candida albicans overgrowth, are of questionable value in treating patients with CFS. The rotation diet is not balanced and does not meet the current recommended dietary intake levels. Diet strategies that call for the avoidance of food additives, preservatives, sweeteners, and other ingredients are not supported by available evidence and are not practical for patients with CFS.

A diet plan for patients with CFS should be based on sound nutritional principles and common sense. Until the results of studies demonstrating the benefits of particular diet therapies in the management of CFS are available, patients with CFS are advised to eat a varied diet selected from among and within the basic food groups to ensure an adequate nutrient intake and to reach and maintain a reasonable body weight.

 

Source: Morris DH, Stare FJ. Unproven diet therapies in the treatment of the chronic fatigue syndrome. Arch Fam Med. 1993 Feb;2(2):181-6. http://www.ncbi.nlm.nih.gov/pubmed/8275187

 

Clinical presentation of chronic fatigue syndrome

Abstract:

Chronic fatigue syndrome (CFS) is a chronic illness of uncertain aetiology characterized by at least six months of debilitating fatigue and associated symptoms. The symptoms of the syndrome are all non-specific and some (but not all) are also seen in psychiatric illness. The symptomatology suggesting an organic component to the illness includes its abrupt onset with an ‘infectious-like’ illness, intermittent unexplained fevers, arthralgias and ‘gelling’ (stiffness), sore throats, cough, photophobia, night sweats, and post-exertional malaise with systemic symptoms. The illness can last for years and is associated with marked impairment of functional health status.

 

Source: Komaroff AL. Clinical presentation of chronic fatigue syndrome. Ciba Found Symp. 1993;173:43-54; discussion 54-61. http://www.ncbi.nlm.nih.gov/pubmed/8491106

 

Chronic fatigue syndrome and the treatment process

Abstract:

Fatigue is a common complaint in general practice and is often associated with psychiatric and psychosocial problems and demoralization. Although the Centers for Disease Control definition of chronic fatigue syndrome (CFS) excludes pre-existing psychiatric illness, common psychosocial problems short of a clinical disorder (such as irritability, difficulty in thinking, inability to concentrate, depression and sleep disturbance) overlap with the criteria for CFS.

Psychological states can affect the course of CFS or become confused in the patient’s and doctor’s mind with the course of infection. The core dilemma in practice is how aggressively to pursue a possible basis for CFS when it persists in the absence of an identifiable external cause. Possibilities for exploration are numerous and potentially expensive. In practice, the persistence of doctors depends on the patient’s illness behaviour, on financial and organizational factors, and on the culture of medical care and practice styles.

It is essential to differentiate the appropriate management of CFS from scientific study where intensive investigation may be warranted. In practice doctors should proceed in a manner that conveys concern, supports function, and avoids dysfunctional illness behaviour and inadvertent legitimization and reinforcement of disability.

 

Source: Mechanic D. Chronic fatigue syndrome and the treatment process. Ciba Found Symp. 1993;173:318-27; discussion 327-41. http://www.ncbi.nlm.nih.gov/pubmed/8491105