Abstract：
BACKGROUND:Elderly patients in general exhibit a higher incidence of chronic and neuropathic pain conditions. This group poses a particular clinical challenge due to age-related pharmacokinetic and pharmacodynamic issues, comorbid conditions, and polypharmacy, as well as frailty and cognitive decline. Poor control of pain has consistently been identified as an issue for older people. The identification of safe and efficacious treatments for chronic pain remains a critical public health concern, especially considering the progressive increase of the world's elderly population. OBJECTIVES:This narrative review deals with the principal alterations of the somatosensory system together with changes in non-neuronal cells in the course of aging. The possibility to control chronic pain based on an innovative strategy which addresses non-neuronal cell dysregulation control will also be discussed. STUDY DESIGN:Narrative review. RESULTS:Peripheral nerves display functional, structural, and biochemical changes with aging that mainly involve Aδ fibers. Alteration in the responses to heat pain in the middle insular cortex and primary somatosensory cortex are also observed in the elderly. In general, pain threshold increases with age while the threshold of pain tolerance remains unchanged or decreases. Additionally, other important modifications of the pain perception system in this age group consist in a clear reduction in the descending inhibitory capacity with an associated increase in central sensitization. Furthermore, different changes concern immune system cells, such as mast cells and microglia, that with age show an increase in their sensitivity to noxious stimuli and a decreased capability to be regulated by homeostatic endogenous systems. Since these cells are the primary interlocutors for pain neurons, their alterations lead to changes that promote persistent neuroinflammation, thereby impacting pain neuronal cell functionality. LIMITATION:This review is not an exhaustive review for the current evidence supporting the role of immune cells in influencing pain somatosensory neuron functions. It is also important to stress the small number of studies designed to determine the efficacy and safety of anti-pain therapies in elderly patients. CONCLUSION:Non-neuronal cells of immune system origin such as microglia and mast cells, along with astrocytes, are capable of influencing pain somatosensory neuron functions. These nervous system non-neuronal cells may thus be viewed as innovative targets for persistent pain control. Among therapies aiming at preserving the functionality of non-neuronal cells, palmitoylethanolamide, with its high efficacy/risk ratio, may be an excellent co-treatment for the ever-growing elderly population with chronic pain.
journal_name
Pain Physicianjournal_title
Pain physicianauthors
Paladini A,Fusco M,Coaccioli S,Skaper SD,Varrassi Gsubject
Has Abstractpub_date
2015-09-01 00:00:00pages
E863-76issue
5eissn
1533-3159issn
2150-1149journal_volume
18pub_type
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