Pain
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Little is known about how children develop or express their empathy for another individual's pain. The current study compared the behavioural expression of empathy for pain with that for emotion, specifically sadness, in children. One hundred twenty children (60 boys, 60 girls) between the ages of 18 and 36 months (M=26.44 months; SD=5.17) were assessed for their empathy-related behavioural responses to simulations of an adult's pain and sadness, each presented separately. ⋯ Language showed very little predictive value. These findings highlight both conceptual similarities across, and important differences between, children's expressions of empathy for pain and for sadness. Pain appears to be more easily ignored and results in fewer prosocial responses in children.
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The present study examined whether enhancement of endogenous cannabinoid levels by administration of the fatty acid amide hydrolase inhibitor URB597 could modulate joint nociception in 2 rodent models of osteoarthritis (OA). OA-like changes were induced in male Wistar rats by intra-articular injection of monoiodoacetate, while Dunkin-Hartley guinea pigs (age 9-12 months) develop OA naturally and were used as a model of spontaneous OA. Joint nociception was measured by recording electrophysiologically from knee joint primary afferents in response to noxious hyper-rotation of the joint before and after close intra-arterial injection of URB597 (0.03 mg; 0.1 mL bolus); the CB(1) receptor antagonist AM251 (1 mg/kg intraperitoneally) or the CB(2) receptor antagonist AM630 (1 mg/kg intraperitoneally). ⋯ Systemic URB597 administration significantly reduced hindlimb incapacitance in monoiodoacetate joints and co-administration of the CB(1) antagonist abolished this effect. Local injection of URB597 into OA knee joints reduces mechanonociception and pain, and this response is mediated by CB(1) receptors. Targeting endocannabinoid-metabolizing enzymes in the peripheral nervous system could offer novel therapeutic approaches for the treatment of OA pain.
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Few studies have systematically evaluated nonmedical use of prescription opioids (NMU) among U. S. military veterans, those who report pain, and those with human immunodeficiency virus (HIV). An increased understanding of the factors associated with NMU may help providers to balance maintaining patient access to prescription opioids for legitimate medical reasons and reducing the risks of addiction. ⋯ Being overweight (AOR 0.6) or obese (AOR 0.5) and having a higher 12-Item Short-Form Health Survey (SF-12) Mental Component Summary (AOR 0.98) were associated with less NMU. Patients with and without NMU did not differ on HIV status or SF-12 Physical Component Summary. Veterans in care have a high prevalence of NMU that is associated with substance use, medical status, and pain interference, but not HIV status.
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Epidemiological evidence indicates that African Americans receive lower quality pain treatment than European Americans. However, the factors causing these disparities remain unidentified, and solutions to this problem remain elusive. Across three laboratory experiments, we examined the hypotheses that empathy is not only causing pain treatment disparities but that empathy-inducing interventions can reduce these disparities. ⋯ Furthermore, Pro-White empathy biases were highly predictive of pro-White pain treatment biases. The magnitude of the empathy bias experienced predicted the magnitude of the treatment bias exhibited. These findings suggest that empathy plays a crucial role in racial pain treatment disparities in that it appears not only to be one likely cause of pain treatment disparities but also is an important means for reducing racial disparities in pain treatment.