Firestormm
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US Department of Health and Human Services
AHRQ Agency for Healthcare Research and Quality
AHRQ Agency for Healthcare Research and Quality
Research Protocol
May, 01, 2014
Diagnosis and Treatment of Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS)
Table of Contents
Background and Objectives for the Systematic Review
Myalgic Encephalomyelitis (ME)/Chronic Fatigue Syndrome (CFS) is a condition characterized by a constellation of symptoms, with post-exertional malaise and/or chronic and disabling fatigue being the hallmark. In an attempt to describe the condition based on the proposed etiologies, several other terms have been used, including post viral fatigue syndrome and chronic fatigue immune dysfunction syndrome.1-4
The term ME was first used in the 1930s after an outbreak of neuromyesthenia and CFS was first coined in the 1980s, with both conditions having overlapping features.3-5 Over the years, there has been disagreement on the underlying etiology and whether the conditions represented by these terms reflect a single pathologically discrete syndrome, subsets of the same illness, or a nonspecific condition shared by other disease entities. The two persisting terms, ME and CFS, have more recently been used interchangeably4 despite the ongoing controversy.
The first set of clinical criteria defining the condition were published in 19883 and have been further developed over the years most notably with the 1994 Fukuda criteria,2 the 2003 Canadian clinical case definition,1 and in 2011 with the international consensus criteria.7 (see Table 1).
This most recent international consensus report advocates moving away from the term CFS in favor of ME to better reflect an underlying pathophysiology involving widespread inflammation and neuropathology, and to embrace the two terms as synonymous.7
The syndrome that encompasses ME/CFS is characterized by various manifestations of diffuse symptoms including post-exertional malaise and/or persistent and disabling fatigue, pain, sleep disturbance, neurological and cognitive manifestations (i.e., impaired concentration, mental processing, memory), motor impairment, and altered immune and autonomic responses.1,2,7
The variable symptomatology and lack of an identifiable disease process with gold standard of measurement have challenged researchers and clinicians in their attempts to better understand the disease process and its effects on patients.
The prevalence of ME/CFS is also difficult to estimate given the uncertainty of the case definition. The CDC reported a U.S. prevalence of 0.3 percent with over 1,000,000 adults with the disorder in the U.S.8 By using different case definitions, some suggest that the rate is as high as 2.5 percent.4,9
Currently there are no U.S. Food and Drug Administration (FDA) approved medications for the treatment of ME/CFS, but many have been used to treat the associated symptoms. The burden of disease and economic impact from both medical and societal costs may be in the billions of dollars. Thus finding ways to accurately diagnose patients to optimize management has significant public health importance and consequences.
Controversies surrounding ME/CFS have led to wide variations in the clinical management of patients, including uncertainty in etiology, diagnosis, and approach to treatment. Identifying treatment interventions and meaningful clinical outcomes is also challenging, given the breadth of symptoms and the uncertainty as to whether specific symptom combinations define subsets of patients that may respond uniquely to different approaches.
When patients were surveyed in April, 2013 as part of the U.S. Food and Drug Administration’s (FDS’s) patient-focused drug development initiative, treatments fell into two broad categories, those intended to treat the underlying cause of the disease and those targeting specific symptoms. The first category included immune modulators such as rintatolimod and rituximab, and antiviral and antibiotic medications.
Interventions targeting symptoms included medications to treat pain, fatigue, and sleep dysfunction, and non-drug therapies which included yoga, stretching and relaxation techniques, counseling on pacing strategies, and mental exercises.10
An examination of the comparative effectiveness and harms of treatments for ME/CFS is important to guide clinical practice, which underscores the need for a systematic review on this topic. This report focuses on the clinical outcomes surrounding the attributes of fatigue, especially post-exertional malaise and persistent fatigue, and its impact on overall function and quality of life because these are unifying features of ME/CFS that impact patients.
This topic was nominated by the Office of Disease Prevention (ODP) at the National Institutes of Health to Inform an Evidence-based Methodology Workshop on ME/CFS. The Working Group convened by ODP assisted in refining the topic...
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