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Symptoms of autonomic dysfunction in chronic fatigue syndrome

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By J. L. Newton et al. • www.ProHealth.com • September 5, 2014


Editor’s comment: The authors of this study concluded that there is “a clear and significant association between CFS (identified using the established Fukuda criteria) and the symptoms of autonomic dysfunction … A particularly strong association was seen with symptoms of orthostatic intolerance, suggesting that abnormality of dynamic blood pressure regulation is particularly associated with fatigue severity in CFS/ME.” This study supports the theory that ME/CFS is a form of dysautonomia. 

Note: You can read the full study here.


By J. L. Newton et al.

Abstract

BACKGROUND: Chronic fatigue syndrome (CFS) is common and its cause is unknown.

AIM: To study the prevalence of autonomic dysfunction in CFS, and to develop diagnostic criteria.

DESIGN: Cross-sectional study with independent derivation and validation phases.

METHODS: Symptoms of autonomic dysfunction were assessed using the Composite Autonomic Symptom Scale (COMPASS). Fatigue was assessed using the Fatigue Impact Scale (FIS). Subjects were studied in two groups: phase 1 (derivation phase), 40 CFS patients and 40 age- and sex-matched controls; phase 2 (validation phase), 30 CFS patients, 37 normal controls and 60 patients with primary biliary cirrhosis.

RESULTS: Symptoms of autonomic dysfunction were strongly and reproducibly associated with the presence of CFS or primary biliary cirrhosis (PBC), and correlated with severity of fatigue. Total COMPASS score >32.5 was identified in phase 1 as a diagnostic criterion for autonomic dysfunction in CFS patients, and was shown in phase 2 to have a positive predictive value of 0.96 (95%CI 0.86-0.99) and a negative predictive value of 0.84 (0.70-0.93) for the diagnosis of CFS.

DISCUSSION: Autonomic dysfunction is strongly associated with fatigue in some, but not all, CFS and PBC patients. We postulate the existence of a 'cross-cutting' aetiological process of dysautonomia-associated fatigue (DAF). COMPASS >32.5 is a valid diagnostic criterion for autonomic dysfunction in CFS and PBC, and can be used to identify patients for targeted intervention studies.

Source: Newton JL, Okonkwo O, Sutcliffe K, Seth A, Shin J, Jones DE. QJM. 2007 Aug;100(8):519-26. Epub 2007 Jul 7.




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