Assessment of the concordance between DN4 scores performed by the patient (self-assessment) or by the physician (hetero-assessment) to detect subacute neuropathic postoperative pain

Abstract

Background: Centres dedicated to chronic postsurgical pain (CPSP) have been developed, but delays for accessing to it are generally long. Teleconsultation might be a means to facilitate access to care by allowing an initial triage. CPSPs are neuropathic pain in around half of the cases and their diagnosis is mainly based on the score obtained from validated questionnaires. Among them, those requiring a neurological examination (i.e. the Douleur Neuropathique en 4 questions [DN4]) have a better sensitivity and specificity, and should be preferred. However, effectiveness of a remote neurological examination remains to be established. The aim of this observational study is to check during a face-to-face consultation if, after a short training, a naïve patient is capable to self-assess the clinical signs of neuropathic sensations.

Methods: Thirty patients with suspected neuropathic pain were seen in a face-to-face postoperative pain consultation. Before examination, the patient was instructed to fill the DN4 questionnaire, including the neurological examination. Once explanations were given and checked, the patient was left and completed it alone. Then, the pain physician performed the DN4 questionnaire. Inter-rater reliability between patient and pain physician was assessed for each item and for DN4 score with the Kappa coefficient.

Results: For each item of the DN4 questionnaire, Kappa coefficients were between 0.74 and 1, and could be considered as excellent. For DN4 ≥ 4, the Kappa coefficient was 0.86.

Conclusions: Our results suggest that after a short training, a naïve patient is capable of recognizing and diagnosing symptoms of neuropathic pain.

Significance: Our results suggest that self-assessment, carried out after brief training and using a simple tool, provides results comparable to those obtained by a specialist physician to diagnose symptoms of neuropathic pain. If the results of the current study are confirmed on a larger scale, self-assessment will help improve access to specialized chronic pain care by better orienting patients and opening up access to teleconsultations.