Original Research Article
Prevalence of Neuropathic Pain According to the IASP Grading System in Patients with Chronic Non-Malignant Pain
- Conflict of interest: Per Grunwald Andersen has participated in pain congresses sponsored by Norpharma and Pfizer Denmark in the period 2011–2012. Gitte Handberg has participated in pain congresses sponsored by Grunenthal ApS Denmark in 2012.
- Thomas Peter Enggaard has been a member of a national advisory board for Grunenthal ApS Denmark in the period 2010–2011.
The primary objective was to determine the prevalence of neuropathic pain according to the new International Association for the Study of Pain (IASP) grading system. The secondary objective was to compare the system classification of neuropathic pain with the classification of neuropathic pain according to a patient-administered screening questionnaire.
A Multidisciplinary Pain Center.
One hundred twenty patients with a variety of chronic pain conditions referred to a multidisciplinary pain center.
Consecutively referred patients filled out the PainDETECT Questionnaire before the first consultation. During the first consultation, patients had pain history taken and bedside examination performed by a pain specialist. Patients were classified according to the score on the PainDETECT Questionnaire and graded according to the IASP grading system about the certainty of neuropathic pain.
According to the IASP grading system, 22 patients (18.3%) classified as probable or definite neuropathic pain and 90 patients (75%) as unlikely neuropathic pain. According to the PainDETECT Questionnaire, 55 patients (45%) were classified as likely neuropathic pain and 13 patients (10.8%) as unlikely neuropathic pain. Eleven patients (20%) who were classified as neuropathic pain according to PainDETECT were also classified as probable or definite neuropathic pain by the new IASP grading system.
According to the new IASP grading system, less than 20% of the patients referred to a multidisciplinary pain center fulfilled the criteria for neuropathic pain. The classification of neuropathic pain with the IASP system varies from the classification of neuropathic pain with the use of a self-administered screening questionnaire.