Articles: chronic-pain.
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Meta Analysis
Size reduction of the right amygdala in chronic pain patients with emotional stress: A systematic review and meta-analysis.
The structural impact of chronic pain on amygdala in chronic pain (CP) patients remains unclear, although major depression and anxiety are known to be associated with its increase and decrease in size, respectively. This study aimed at examining the relationship between emotional stress and amygdala size in CP patients. The effects of mediating and moderating variables were also examined. ⋯ Besides, pain from a single body region was more likely to impact the amygdala size compared to diffuse pain (P = .02). Regression analysis revealed no significant association between continuous variables (age, gender, pain duration/intensity) and amygdala size. Our findings demonstrated that emotional stress was associated with a reduced right amygdala size in CP patients.
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Meta Analysis
Effects of Ketamine on Chronic Postsurgical Pain in Patients Undergoing Surgery: A Systematic Review and Meta-analysis.
Chronic postsurgical pain (CPSP) has become a common complication during the perioperative period. The efficacy of one of the most potent strategies, ketamine, remains unclear. ⋯ We discovered that intravenous ketamine may reduce the incidence of CPSP in patients undergoing surgery, especially 3 - 6 months postsurgery. Because of the small sample size and high heterogeneity of the included studies, the effect of ketamine in the treatment of CPSP still needs to be explored in future large-sample, standardized-assessment studies.
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Comment Meta Analysis
In patients with chronic neuropathic pain, cannabinoids improve sleep and reduce pain vs. placebo.
McParland AL, Bhatia A, Matelski J, et al. Evaluating the impact of cannabinoids on sleep health and pain in patients with chronic neuropathic pain: a systematic review and meta-analysis of randomized controlled trials. Reg Anesth Pain Med. 2022;48:180-190. 36598058.
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Approximately one in four total knee replacement patients develop persistent pain. Identification of those at higher risk could help inform optimal management. ⋯ Rigorously conducted observational studies are required to establish the relative importance of higher levels of peri-operative pain and pain catastrophizing with persistent pain after knee replacement surgery.