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Going on 15 years. I've been through the wringer, from being almost completely bedridden to being able to work f/t (work only, not enough strength for a social life or hobbies); and everything in between. Don't use the CDC definition - the Canadian Clinical Definition is by far the most comprehensive and specific. The CDC changed it in 1994, and it broadened the spectrum; many people were being diagnosed with it that really didn't have it at all. It isn't just about being tired, it is a neuro-endocrine immune disorder, affecting those systems. (fyi, M.E. is Myalgic Encephalomyelitis, what CFS/CFIDS is known as in most other countries; some would argue that it is a subset of CFS. There is also evidence of either a hit and run injury to the brain from a virus, and/or a virus attacking the heart, as many have diastolic cardiomyopathy. (or that could be another subset) The Canadian Expert Consensus Panel has published a medical milestone, the first clinical case definition for the disease known as myalgic encephalomyelitis/chronic fatigue syndrome. This definition is clearly a vast improvement over the CDC's 1994 Fukuda criteria, which led to misunderstanding in both research and treatment modalities by making "fatigue" a compulsory symptom but by downplaying or making optional the disease's hallmark of post-exertional sickness and other cardinal ME/CFS symptoms. In sharp contrast to the Fukuda criteria, this new clinical case definition makes it compulsory that in order to be diagnosed with ME/CFS, a patient must become symptomatically ill after exercise and must also have neurological, neurocognitive, neuroendocrine, dysautonomic, circulatory, and immune manifestations. In short, symptoms other than fatigue must be present for a patient to meet the criteria. The complete 109-page article "Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: Clinical Working Case Definition, Diagnostic and Treatment Protocols," was published in the Journal of Chronic Fatigue Syndrome, Vol. 11 (1) 2003, pp. 7-116.
1. POST-EXERTIONAL MALAISE AND FATIGUE: There is a loss of physical and mental stamina, rapid muscular and cognitive fatigability, post-exertional fatigue, malaise and/or pain, and a tendency for other symptoms to worsen. A pathologically slow recovery period (it takes more than 24 hours to recover). Symptoms exacerbated by stress of any kind. Patient must have a marked degree of new onset, unexplained, persistent, or recurrent physical and mental fatigue that substantially reduces activity level.
2. SLEEP DISORDER: Unrefreshing sleep or poor sleep quality; rhythm disturbance.
3. PAIN: Arthralgia and/or myalgia without clinical evidence of inflammatory responses of joint swelling or redness. Pain can be experienced in the muscles, joints, or neck and is sometimes migratory in nature. Often, there are significant headaches of new type, pattern, or severity.
4. NEUROLOGICAL/COGNITIVE MANIFESTATIONS: Two or more of the following difficulties should be present: confusion, impairment of concentration and short-term memory consolidation, difficulty with information processing, categorizing, and word retrieval, intermittent dyslexia, perceptual/sensory disturbances, disorientation, and ataxia. There may be overload phenomena: informational, cognitive, and sensory overload -- e.g., photophobia and hypersensitivity to noise -- and/or emotional overload which may lead to relapses and/or anxiety.
5. AT LEAST ONE SYMPTOM OUT OF TWO OF THE FOLLOWING CATEGORIES:
AUTONOMIC MANIFESTATIONS: Orthostatic Intolerance: e.g., neurally mediated hypotension (NMH), postural orthostatic tachycardia syndrome (POTS), delayed postural hypotension, vertigo, light-headedness, extreme pallor, intestinal or bladder disturbances with or without irritable bowel syndrome (IBS) or bladder dysfunction, palpitations with or without cardiac arrhythmia, vasomotor instability, and respiratory irregularities.
NEUROENDOCRINE MANIFESTATIONS: loss of thermostatic stability, heat/cold intolerance, anorexia or abnormal appetite, marked weight change, hypoglycemia, loss of adaptability and tolerance for stress, worsening of symptoms with stress and slow recovery, and emotional lability.
IMMUNE MANIFESTATIONS: tender lymph nodes, sore throat, flu-like symptoms, general malaise, development of new allergies or changes in status of old ones, and hypersensitivity to medications and/or chemicals.
6. The illness persists for at least 6 months. It usually has an acute onset, but onset also may be gradual. Preliminary diagnosis may be possible earlier. The disturbances generally form symptom clusters that are often unique to a particular patient. The manifestations may fluctuate and change over time. Symptoms exacerbate with exertion or stress.
This summary is paraphrased from Dr. Kenny van DeMeirleir's book Chronic Fatigue Syndrome: A Biological Approach, February 2002, CRC Press, pg. 275. A few edits and suggestions were added by the M.E. Society of America. As we have noted, the M.E. Society of America holds that this is the best case definition so far, although it is not perfect. Listing more cardiac and neurological symptoms (e.g., chest pain, left-side chest aches, tachycardia, and neuropathy pain), and emphasizing muscle weakness and faintness instead of “fatigue,” would have more accurately represented the symptomatology and vastly improved the criteria (please see our M.E. Definitional Framework on this website). Nevertheless, the Canadian Consensus Panel clinical case definition more accurately represents the experience and manifestations of the disease than other current case definitions. Again, for the 30-page diagnostic ME/CFS case definition click http://www.cfids-cab.org/MESA/ccpccd.pdf http://www.cfids-cab.org/MESA/ccpc.html
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