• Bmc Musculoskel Dis · Jan 2012

    Comparative Study

    Pain drawings in somatoform-functional pain.

    • Niklaus Egloff, Rafael J A Cámara, Roland von Känel, Nicole Klingler, Elizabeth Marti, and Marie-Louise Gander Ferrari.
    • Division of Psychosomatic Medicine, Department of General Internal Medicine, Inselspital, Bern University Hospital and University of Bern, Bern, Switzerland. niklaus.egloff@insel.ch
    • Bmc Musculoskel Dis. 2012 Jan 1; 13: 257.

    BackgroundPain drawings are a diagnostic adjunct to history taking, clinical examinations, and biomedical tests in evaluating pain. We hypothesized that somatoform-functional pain, is mirrored in distinctive graphic patterns of pain drawings. Our aim was to identify the most sensitive and specific graphic criteria as a tool to help identifying somatoform-functional pain.MethodsWe compared 62 patients with somatoform-functional pain with a control group of 49 patients with somatic-nociceptive pain type. All patients were asked to mark their pain on a pre-printed body diagram. An investigator, blinded with regard to the patients' diagnoses, analyzed the drawings according to a set of numeric or binary criteria.ResultsWe identified 13 drawing criteria pointing with significance to a somatoform-functional pain disorder (all p-values ≤ 0.001). The most specific and most sensitive criteria combination for detecting somatoform-functional pain included the total number of marks, the length of the longest mark, and the presence of symmetric patterns. The area under the ROC-curve was 96.3% for this criteria combination.ConclusionPain drawings are an easy-to-administer supplementary technique which helps to identify somatoform-functional pain in comparison to somatic-nociceptive pain.

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