Prevalence and features of chronic pain syndrome in persons over 65 years old: Russian epidemiological study EVKALIPT

Abstract

Background . The prevalence of chronic pain syndrome in general population of older adults in the Russian Federation is unknown. Aim . To study the prevalence and features of chronic pain syndrome in subjects aged ≥65 years. Materials and methods . There were examined 4308 subjects (30% males) aged from 65 to 107 years (mean age 78±8 years), living in 11 regions of the Russian Federation, who were divided into 3 age groups (65–74 years, 75– 84 years and ≥85 years). All participants underwent a comprehensive geriatric assessment consisted of two stages: 1) questioning based on a specially designed questionnaire; 2) physical examination. The «Chronic pain» module of questionnaire included: 1) questions concerning the presence, localization, character and frequency of chronic pain syndrome, as well as the frequency of taking analgesics; 2) self-assessment of pain intensity on a visual-analogue scale at the moment of examination and for the previous week; 3) DN4 questionnaire to detect neuropathic pain. Results . The prevalence of chronic pain syndrome was 87.2%, including 83.8% in subjects aged 65–74 years, 87.7% — 75–84 years, 91.1% — ≥85 years (p for trend <0.001). In women, chronic pain was detected more often than in men (90.2% vs. 80.2%; p<0.001). The most frequent localization of pain syndrome were large joints (75%), back (68%) and head (64%). The prevalence of different types of pain was as follows: nociceptive — 67.3%, neuropathic — 21.2%, nociplastic — 11.4%. With age, the frequency of detection of neuropathic pain increased (from 18.9% in patients aged 65–74 to 23.8% in patients ≥85 years; p for trend = 0.013), nociplastic, on the contrary, decreased (from 13.8% to 9%; p for trend = 0.001), and nociceptive — remained unchanged (67.3% in patients aged 65–74, 67.6% — 75–84 years, 67.2% — ≥85 years; p for trend = 0.974). In patients with neuropathic pain, more severe manifestations of pain syndrome were revealed: they were more likely to experience pain of any localization with a large number of pain zones/areas, they had a higher frequency and intensity of pain syndrome, and they were more likely to take analgesics and noted limitations in daily life due to pain. Conclusion . In the EVKALIPT study, for the first time, domestic data on the prevalence and features of chronic pain syndrome in subjects aged ≥65 years in the general population was obtained.

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