Evidence browser

Differential-display PCR of peripheral blood for biomarker discovery in chronic fatigue syndrome.

Steinau, Martin, Unger, Elizabeth R, Vernon, Suzanne D et al.·Journal of molecular medicine (Berlin, Germany)·2004

Researchers looked at immune cells from one ME/CFS patient and one healthy person to find differences in which genes were turned on or off. They found about 10 genes that behaved differently between the two people, with most differences present even before exercise. Many of these genes are involved in immune function, suggesting that ME/CFS may involve problems with how the immune system works.

E3 PreliminaryCohortPEM not requiredCase-Control

A case with chronic fatigue syndrome with positive antinuclear antibody followed by postpartum thyroiditis.

Itoh, Yasuhiko, Hamada, Hisamitsu, Igarashi, Tohru et al.·Modern rheumatology·2004

This case study describes a patient who had ME/CFS along with a positive antinuclear antibody (ANA)—a blood marker sometimes seen in autoimmune conditions. Five years after developing ME/CFS, the patient developed postpartum thyroiditis, an autoimmune thyroid condition that occurs after pregnancy. The doctors discussed how autoimmune conditions affecting the immune system might be connected to both ME/CFS and thyroid problems.

E3 PreliminaryCommentaryPEM not requiredEditorial

Fatigue in neurological disorders.

Chaudhuri, Abhijit, Behan, Peter O·Lancet (London, England)·2004

This review examines fatigue in various neurological diseases, including ME/CFS. The authors explain that fatigue can result from problems in muscle function (where muscles can't sustain effort) or problems in the brain and nervous system (where the brain perceives activities as requiring excessive effort). They suggest that imbalances in stress hormones and disrupted communication between key brain regions may underlie persistent fatigue.

Endocrine Disruption

New insights into culture driven disorders.

Aceves-Avila, Francisco Javier, Ferrari, Robert, Ramos-Remus, Cesar·Best practice & research. Clinical rheumatology·2004

This editorial examines why conditions like ME/CFS, fibromyalgia, and similar illnesses are often difficult for doctors to diagnose using standard tests. The authors suggest that social and cultural factors—including how society views these diseases and how disability systems work—play a major role in how these illnesses show up in patients. They argue that understanding these broader influences could help doctors offer better support to patients.

Diagnostics

E3 PreliminaryMechanismPEM not requiredObservational

Learning and memorization impairment in childhood chronic fatigue syndrome manifesting as school phobia in Japan.

Miike, Teruhisa, Tomoda, Akemi, Jhodoi, Takako et al.·Brain & development·2004

This study followed children with chronic fatigue syndrome (CFS) in Japan over 15 years to understand why they experience severe tiredness and difficulty learning and remembering information. The researchers found that these children had problems with their autonomic nervous system (the automatic system controlling heart rate, temperature, and digestion), disrupted sleep-wake cycles similar to jet lag, and reduced blood flow to certain brain areas. Understanding these patterns may help explain why learning becomes so difficult for children with CFS.

SleepCognitive Impairment

E3 PreliminaryReviewPEM not requiredReview-Narrative

[Chronic fatigue syndrome in a cognitive perspective. A therapeutic model].

d'Elia, Giacomo·Lakartidningen·2004

This paper describes how cognitive therapy—a type of talk therapy focused on thoughts and beliefs—can help people with ME/CFS. The approach recognizes that unhelpful thoughts about the illness (like believing symptoms mean serious physical harm) can interact with real physical problems and low mood, creating a cycle that keeps people tired and inactive. A therapist works with the patient to gently challenge these beliefs and plan small increases in activity to show that feared outcomes don't happen.

E3 PreliminaryCohortPEM not requiredCase-Control

[Polyneuritis cranialis HHV-6 infection associated].

Brustia, Diego, Uglietti, Alessia, Garavelli, Pietro Luigi·Recenti progressi in medicina·2004

This case study describes one patient with a rare condition called polyneuritis cranialis (weakness affecting multiple nerves in the head and face) that was linked to a human herpesvirus-6 (HHV-6) infection. The patient was treated with an antiviral medication called ganciclovir, and her symptoms improved only after the virus was completely cleared from her body.

Pain and SensitizationAutonomic Nervous System

Physiology and pathophysiology of the 5-HT3 receptor.

Färber, L, Haus, U, Späth, M et al.·Scandinavian journal of rheumatology. Supplement·2004

This review examines how a specific brain chemical receptor called 5-HT3 works in the body and what happens when it malfunctions. The researchers found that blocking this receptor with certain medications may help treat several conditions, including ME/CFS, by reducing symptoms like nausea, pain, and anxiety. However, scientists still don't fully understand exactly how this receptor causes problems in these different illnesses.

E3 PreliminaryDiagnosticPEM not requiredMethods-Paper

Q fever (coxiellosis): epidemiology and pathogenesis.

Woldehiwet, Zerai·Research in veterinary science·2004

Q fever is an infection caused by bacteria that spread from animals to humans, usually through contact with infected livestock. In some people, Q fever causes a long-lasting illness with fatigue, similar to ME/CFS symptoms. This review summarizes what we know about how Q fever spreads and why it makes people sick.

Decreased fractal correlation in diurnal physical activity in chronic fatigue syndrome.

Ohashi, K, Bleijenberg, G, van der Werf, S et al.·Methods of information in medicine·2004

This study looked at how physical activity patterns differ between people with ME/CFS and healthy people throughout the day. Researchers used special mathematical tools to analyze activity data and found that people with ME/CFS have more sudden, abrupt stops in their activities during the day—possibly because fatigue forces them to rest unexpectedly. This pattern was not seen in healthy control subjects.

Post-Exertional Malaise

Effect of Hochu-ekki-to (TJ-41), a Japanese Herbal Medicine, on Daily Activity in a Murine Model of Chronic Fatigue Syndrome.

Wang, Xin Q, Takahashi, Takashi, Zhu, Shi-Jie et al.·Evidence-based complementary and alternative medicine : eCAM·2004

Researchers tested a Japanese herbal medicine called Hochu-ekki-to (TJ-41) in mice with an experimentally induced condition similar to ME/CFS. Mice treated with the herb showed better activity levels and survived longer than untreated mice, suggesting the herb may help reduce activity loss associated with chronic fatigue-like conditions.

E3 PreliminaryDiagnosticPEM not requiredMethods-Paper

Muscle metabolism with blood flow restriction in chronic fatigue syndrome.

McCully, Kevin K, Smith, Sinclair, Rajaei, Sheeva et al.·Journal of applied physiology (Bethesda, Md. : 1985)·2004

This study looked at whether ME/CFS patients have problems with blood flow and how their muscles use oxygen during recovery from exercise. Researchers compared 19 ME/CFS patients to 11 healthy people and found that ME/CFS patients had reduced blood flow to muscles during recovery, but this did not actually impair how well their muscles worked or used oxygen.

Developing and evaluating community-based services through participatory action research: two case examples.

Taylor, Renée R, Braveman, Brent, Hammel, Joy·The American journal of occupational therapy : official publication of the American Occupational Therapy Association·2004

This study shows how occupational therapists can work together with ME/CFS patients and their communities to design better support services. Instead of experts telling people what they need, this approach lets patients and community members have a real voice in deciding what services should be created and how they should work. The researchers used two real-world examples—one with ME/CFS patients and one with AIDS patients—to show how this partnership approach can lead to more helpful and empowering services.

E3 PreliminaryReviewPEM not requiredReview-Narrative

Carnitines and its congeners: a metabolic pathway to the regulation of immune response and inflammation.

Famularo, Giuseppe, De Simone, Claudio, Trinchieri, Vito et al.·Annals of the New York Academy of Sciences·2004

This review discusses carnitine, a natural substance in the body that helps cells produce energy from fats. Carnitine levels are low in several conditions involving immune problems, including ME/CFS. The authors suggest that low carnitine may contribute to immune dysfunction and excessive inflammation, and that carnitine treatment might help restore normal immune function.

Energy MetabolismImmune System

Is chronic fatigue syndrome an autoimmune disorder of endogenous neuropeptides, exogenous infection and molecular mimicry?

Staines, Donald R·Medical hypotheses·2004

This paper proposes that ME/CFS may develop when the immune system mistakenly attacks natural signaling chemicals in the body called vasoactive neuropeptides, which are crucial for nerve function, blood flow, temperature regulation, and immune balance. The author suggests this autoimmune attack could be triggered by infection, intense exercise, or occur on its own, and explains how damage to these chemicals could cause the main symptoms of ME/CFS including fatigue, muscle pain, brain fog, and chemical sensitivity.

E3 PreliminaryReviewPEM not requiredReview-Narrative

The HPA axis and the genesis of chronic fatigue syndrome.

Cleare, Anthony J·Trends in endocrinology and metabolism: TEM·2004

This review examines whether ME/CFS involves problems with the body's stress hormone system (the HPA axis). While people with long-standing ME/CFS show some changes in this system, early studies suggest these changes may not be present when the illness first develops. Interestingly, lifestyle factors like inactivity and poor sleep may cause these changes, and they can sometimes improve when these factors are addressed.

Endocrine Disruption

E3 PreliminaryMechanismPEM not requiredCross-Sectional

Mechanisms underlying fatigue: a voxel-based morphometric study of chronic fatigue syndrome.

Okada, Tomohisa, Tanaka, Masaaki, Kuratsune, Hirohiko et al.·BMC neurology·2004

This study used brain imaging to compare the brains of people with ME/CFS to healthy individuals. Researchers found that people with ME/CFS had smaller gray matter (the thinking part of the brain) in specific areas of the prefrontal cortex, which is the region responsible for decision-making and regulating sensations. Importantly, the amount of shrinkage in one area of the prefrontal cortex matched how severe each person's fatigue was, suggesting this brain region may play a key role in how our bodies experience and manage fatigue.

E3 PreliminaryMechanismPEM not requiredCross-Sectional

High levels of type 2 cytokine-producing cells in chronic fatigue syndrome.

Skowera, A, Cleare, A, Blair, D et al.·Clinical and experimental immunology·2004

This study looked at immune cells in the blood of ME/CFS patients to see if they respond differently than in healthy people. Researchers found that ME/CFS patients had higher levels of immune cells that produce type 2 cytokines—signaling molecules associated with a particular type of immune response. This suggests the immune system in ME/CFS may be stuck in an unusual activation pattern.

E3 PreliminaryReviewPEM not requiredReview-Narrative

In vivo MR spectroscopy in diagnosis and research of neuropsychiatric disorders.

Cox, I J, Puri, B K·Prostaglandins, leukotrienes, and essential fatty acids·2004

This study reviewed how a specialized brain imaging technique called magnetic resonance spectroscopy can be used to detect chemical changes in the brains of people with chronic fatigue syndrome and other neuropsychiatric conditions. The technique is non-invasive and allows doctors to measure things like energy production, brain cell function, and neurotransmitter activity without surgery. The authors summarized findings from previous research showing what these brain chemistry changes look like in ME/CFS patients.