Clinical validity of ICD-10 neurasthenia.

BACKGROUND

Neurasthenia was defined over a century ago. In view of a questionable clinical validity, it was omitted from the 3rd edition of the American Psychiatric Association's DSM, while it remains as an own diagnostic category in the WHO's ICD-10. The purpose of this study was, therefore, to examine the clinical validity of ICD-10 neurasthenia in a consecutive sample of chronic pain patients.

PATIENTS AND METHODS

We included 193 patients (mean age 45.1, SD +/- 10.2, 63% females) in the study. Psychiatric diagnoses were established by the use of ICD-10 Diagnostic Criteria for Research. In addition, the Screening List for Somatization Symptoms was administered: self-rating of 53 medically unexplained somatic symptoms, and 11 additional screening questions concerning weakness after slight mental or physical exertion and disease conviction.

RESULTS

Thirty-three percent of the patients who fulfilled the criteria of ICD-10 neurasthenia also fulfilled the criteria of ICD-10 somatization disorder, 69% the criteria of ICD-10 undifferentiated somatoform disorder, 14% the criteria of ICD-10 hypochondriacal disorder, 66% the criteria of ICD-10 somatoform autonomic dysfunction, 85% the criteria of ICD-10 persistent somatoform pain disorder and 14% the criteria for sexual dysfunction not caused by organic disorder or disease. The symptom profile of ICD-10 neurasthenia was not clearly distinguishable from the symptom profiles of ICD-10 somatoform disorders and ICD-10 sexual dysfunction.

DISCUSSION

Due to this substantial diagnostic overlap, the clinical validity of ICD-10 neurasthenia remains questionable.