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The Neuropsychiatric and Neuropsychological Features of Chronic Fatigue Syndrome: Revisiting the Enigma

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By Y. Christley et al. • www.ProHealth.com • March 6, 2013


Editor’s Note: Major Depressive Disorder (MDD) is listed among the conditions that exclude a diagnosis of CFS in the CDC “Fukuda” criteria. The 2003 Canadian criteria describe depression as “loosely” connected to CFS. The International Consensus Criteria list reactive depression as a co-morbid entity, but not major depression. The 1991 Oxford Criteria is the only case definition that states that psychiatric disorders, such as depression, “are not necessarily reasons for exclusion.” The Oxford Criteria are not in wide use among researchers outside of the UK.

The neuropsychiatric and neuropsychological features of chronic fatigue syndrome: revisiting the enigma.

~Source: Curr Psychiatry Rep. April, 2013

By Y. Christley et al.

Abstract

The aim of this article is to provide a comprehensive and updated review of the key neuropsychiatric and neuropsychological complaints associated with chronic fatigue syndrome (CFS).

Neuropsychiatric and neuropsychological difficulties are common in CFS and are linked primarily to disorders of mood, affect and behaviour. The neuropsychiatric complaint most frequently encountered amongst CFS patients is depression and in particular major depressive disorder (MDD).

Despite decades of research, the precise aetiological relationship between CFS and MDD remains poorly understood. This has resulted in the development of a number of interesting and polarised hypotheses regarding the aetiological nature of CFS. Recent scientific advances have however begun to unravel a number of interesting inflammatory and immunological explanations that suggest CFS and MDD are distinct yet interrelated conditions.

The possibility that the overlap between CFS and MDD might be explained in terms of shared oxidative and nitrosative (IO&NS) pathways is an area of intense research interest and is reviewed in detail in this article. The overlap between CFS and MDD is further differentiated by variations in HPA axis activity between the two disorders.

Important immunological differences between MDD and CFS are also reviewed with particular emphasis on antiviral RNase L pathways in CFS. In addition to the presence of neuropsychiatric complaints, CFS is also associated with neuropsychological symptoms such as impaired attention, memory and reaction time. The key neuropsychological problems reported by CFS patients are also included in the review in an effort to understand the significance of cognitive impairment in CFS.

Source: Curr Psychiatry Rep. 2013 Apr;15(4):353. doi: 10.1007/s11920-013-0353-8. Christley Y, Duffy T, Everall IP, Martin CR., School of Health, Nursing and Midwifery, University of the West of Scotland, Ayr Campus, University Avenue, Ayr, KA8 0SX, UK




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