Context A variety of interventions have been used in the treatment and management
of chronic fatigue syndrome (CFS). Currently, debate exists among health care
professionals and patients about appropriate strategies for management.
Objective To assess the effectiveness of all interventions that have been evaluated
for use in the treatment or management of CFS in adults or children.
Data Sources Nineteen specialist databases were searched from inception to either
January or July 2000 for published or unpublished studies in any language.
The search was updated through October 2000 using PubMed. Other sources included
scanning citations, Internet searching, contacting experts, and online requests
Study Selection Controlled trials (randomized or nonrandomized) that evaluated interventions
in patients diagnosed as having CFS according to any criteria were included.
Study inclusion was assessed independently by 2 reviewers. Of 350 studies
initially identified, 44 met inclusion criteria, including 36 randomized controlled
trials and 8 controlled trials.
Data Extraction Data extraction was conducted by 1 reviewer and checked by a second.
Validity assessment was carried out by 2 reviewers with disagreements resolved
by consensus. A qualitative synthesis was carried out and studies were grouped
according to type of intervention and outcomes assessed.
Data Synthesis The number of participants included in each trial ranged from 12 to
326, with a total of 2801 participants included in the 44 trials combined.
Across the studies, 38 different outcomes were evaluated using about 130 different
scales or types of measurement. Studies were grouped into 6 different categories.
In the behavioral category, graded exercise therapy and cognitive behavioral
therapy showed positive results and also scored highly on the validity assessment.
In the immunological category, both immunoglobulin and hydrocortisone showed
some limited effects but, overall, the evidence was inconclusive. There was
insufficient evidence about effectiveness in the other 4 categories (pharmacological,
supplements, complementary/alternative, and other interventions).
Conclusions Overall, the interventions demonstrated mixed results in terms of effectiveness.
All conclusions about effectiveness should be considered together with the
methodological inadequacies of the studies. Interventions which have shown
promising results include cognitive behavioral therapy and graded exercise
therapy. Further research into these and other treatments is required using
standardized outcome measures.