Chronic pain in children and adolescents: 24-42 month outcomes of an inpatient/day hospital interdisciplinary pain rehabilitation program.

PURPOSE: The purpose of this research was to describe 24-42 month outcomes of a combined inpatient/day hospital interdisciplinary pain rehabilitation program for children and adolescents with chronic pain and functional disability. METHODS: One-hundred-seventy-three children and adolescents (mean age=15.1 years, SD=2.5) were treated in the three-week program. Mixed effects regression models (MERM) examined changes over time in pain ratings (0-10), school days missed by children and work days missed by parents in the preceding week, and the number of days hospitalized in the preceding month. RESULTS: Participants reported a significant decline in pain from admission to 24-42 month follow-up. The largest declines in pain occurred from discharge to 1-month follow-up (6.20 vs. 4.81 on a 0-10 numerical rating scale) and from 12 months to 24-42 month follow-up (4.90 vs. 3.56). Two distinct trajectories of treatment response were identified using growth mixture modeling: children with initially high pain ratings exhibited large reductions in pain ratings, while those with lower pain ratings at admission showed minimal reductions. Treatment resulted in significant reductions in school and work days missed and the number of days hospitalized (all p's < 0.001), with reductions evident at 1-month follow-up and maintained through 24-42 month follow-up. CONCLUSIONS: These results suggest that interdisciplinary pain rehabilitation is a promising approach to chronic pain and associated disability in children, with enduring improvements found 24-42 months following program completion. Distinct trajectories of treatment response were identified.

Central nervous system reorganization in a variety of chronic pain states: a review.

Chronic pain can develop from numerous conditions and is one of the most widespread and disabling health problems today. Unfortunately, the pathophysiology of chronic pain in most of these conditions, along with consistently effective treatments, remain elusive. However, recent advances in neuroimaging and neurophysiology are rapidly expanding our understanding of these pain syndromes. It is now clear that substantial functional and structural changes, or plasticity, in the central nervous system (CNS) are associated with many chronic pain syndromes. A group of cortical and subcortical brain regions, often referred to as the "pain matrix," often show abnormalities on functional imaging studies in persons with chronic pain, even with different pain locations and etiologies. Changes in the motor and sensory homunculus also are seen. Some of these CNS changes return to a normal state with resolution of the pain. It is hoped that this knowledge will lead to more effective treatments or even new preventative measures. The purpose of this article is to review recent advances in the understanding of the CNS changes associated with chronic pain in a number of clinical entities encountered in the field of physical medicine and rehabilitation. These clinical entities include nonspecific low back pain, fibromyalgia, complex regional pain syndrome, postamputation phantom pain, and chronic pain after spinal cord injury.