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Sudden vs gradual onset of Chronic Fatigue Syndrome (CFS) differentiates individuals on cognitive & psychiatric measures

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By DeLuca J, Johnson SK, Ellis SP, Natelson BH • www.ProHealth.com • January 25, 1997


To examine the influence of mode of illness onset on psychiatric
status and neuropsychological performance, 36 patients with
CFS were divided into two groups: sudden vs gradual onset of
symptoms. These two CFS subgroups were compared to each other
and to sedentary healthy controls on standardized
neuropsychological tests of attention/concentration,
information processing efficiency, memory, and higher cortical
functions. In addition, the distribution of comorbid Axis I
psychiatric disease between the two CFS groups was examined.

The rate of concurrent psychiatric disease was significantly
greater in the CFS-gradual group relative to the CFS-sudden
group. While both CFS groups showed a significant reduction in
information processing ability relative to controls,
impairment in memory was more severe in the CFS-sudden group.
Because of the significant heterogeneity of the CFS
population, the need for subgroup analysis is discussed.




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