Publication: Research - peer-review › Journal article
Patients with neuropathic pain are heterogeneous in etiology, pathophysiology and clinical appearance. They exhibit a variety of pain-related sensory symptoms and signs (sensory profile). Different sensory profiles might indicate different classes of neurobiological mechanisms and hence subgroups with different sensory profiles might respond differently to treatment.The aim of the investigation was to identify subgroups in a large sample of neuropathic pain patients using hypothesis-free statistical methods on the database of three large multi-national research networks (German Research Network on Neuropathic Pain (DFNS), IMI-Europain, Neuropain).Standardized quantitative sensory testing (QST) was used in 902 (test cohort) and 233 (validation cohort) patients with peripheral neuropathic pain of different etiologies. For subgrouping we performed a cluster analysis using 13 QST parameters.Three distinct subgroups with characteristic sensory profiles were identified and replicated: Cluster 1 (sensory loss, 42%) showed a loss of small and large fiber function in combination with paradoxical heat sensations. Cluster 2 (thermal hyperalgesia, 33%) was characterized by preserved sensory functions in combination with heat and cold hyperalgesia and mild dynamic mechanical allodynia. Cluster 3 (mechanical hyperalgesia, 24%) was characterized by a loss of small fiber function in combination with pinprick hyperalgesia and dynamic mechanical allodynia. All clusters occurred across etiologies but frequencies differed.We present a new approach of subgrouping patients with peripheral neuropathic pain of different etiologies according to intrinsic sensory profiles. These three profiles may be related to pathophysiological mechanisms and may be useful in clinical trial design to enrich the study population for treatment responders.
|State||Published - Feb 2017|