The Effect of the Treatment at a Pain Clinic on the Patients' Assessment of Their Pain Intensity and the Incidence of Mental Disorders in the form of Anxiety, Depression, and Aggression

Rs11726196 Single-Nucleotide Polymorphism of the Transient Receptor Potential Canonical 3 (TRPC3) Gene Is Associated with Chronic Pain

Chronic pain is reportedly associated with the transient receptor potential canonical 3 (TRPC3) gene. The present study examined the genetic associations between the single-nucleotide polymorphisms (SNPs) of the TRPC3 gene and chronic pain. The genomic samples from 194 patients underwent linkage disequilibrium (LD) analyses of 29 SNPs within and around the vicinity of the TRPC3 gene. We examined the associations between the SNPs and the susceptibility to chronic pain by comparing the genotype distribution of 194 patients with 282 control subjects. All SNP genotype data were extracted from our previous whole-genome genotyping results. Twenty-nine SNPs were extracted, and a total of four LD blocks with 15 tag SNPs were observed within and around the TRPC3 gene. We further analyzed the associations between these tag SNPs and chronic pain. The rs11726196 SNP genotype distribution of patients was significantly different from the control subjects even after multiple-testing correction with the number of SNPs. The TT + TG genotype of rs11726196 is often carried by chronic pain patients, suggesting a causal role for the T allele. These results contribute to our understanding of the genetic risk factors for chronic pain.

Effect of pain on depression among nursing home residents: Serial mediation of perceived social support and self-rated health. A cross-sectional study

Aim

The aim of this study was to investigate how perceived social support and self‐rated health together could mediate the relationship between pain and depression among Chinese nursing home residents with pain.

Methods

The study was conducted in 38 nursing homes in 13 cities in China. A convenience sample of 2154 older adults responded to the questionnaire survey. A mediation analysis was performed on the data of 990 participants with pain. The data were collected by a questionnaire consisting of socio‐economic and demographic characteristics, the Geriatric Depression Scale‐15, the Multidimensional Scale of Perceived Social Support, Self‐rated Health Scale and the Numerical Rating Scale of pain. The sample was subdivided by sex. Descriptive analysis, t‐tests, chi‐squared tests, Mann–Whitney U‐tests, Spearman correlation analyses and the bootstrap method were used to analyze data.

Results

The prevalence rate of pain and depression among nursing home residents were 46.0% and 20.7% respectively. Pain, perceived social support and self‐rated health were all significantly correlated with depression (r = 0.217, P < 0.01; r = −0.216, P < 0.01; r = 0.385, P < 0.01, respectively). Perceived social support and self‐rated health independently and in series partly explained the relationship between pain and depression.

Conclusions

The results of the study showed that pain was associated with low perceived social support first, and then poor self‐rated health, which was in turn related to the development of depression among nursing home residents with pain. For nursing home residents, perceived social support and self‐rated health as an internal resource can affect the ability to overcome the suffering of pain and reduce the level of depression. Geriatr Gerontol Int 2020; 20: 1234–1240.