Intergenerational transmission of chronic pain-related disability: the explanatory effects of depressive symptoms

PSD-95 Protein: A Promising Therapeutic Target in Chronic Pain

Chronic pain, as a social public health problem, has a serious impact on the quality of patients' life. Currently, the main drugs used to treat chronic pain are opioids, antipyretic, and nonsteroidal anti-inflammatory drugs (NSAIDs). But the obvious side effects limit their use, so it is urgent to find new therapeutic targets. Postsynaptic density (PSD)-95 protein plays an important role in the occurrence and development of chronic pain. The over-expression of the PSD-95 protein and its interaction with other proteins are closely related to the chronic pain. Besides, the PSD-95-related drugs that inhibit the expression of PSD-95 as well as the interaction with other protein have been proved to treat chronic pain significantly. In conclusion, although more deep studies are needed in the future, these studies indicate that PSD-95 and the related proteins, such as NMDA receptor (NMDAR) subunit 2B (GluN2B), AMPA receptor (AMPAR), calmodulin-dependent protein kinase II (CaMKII), 5-hydroxytryptamine 2A receptor (5-HT2AR), and neuronal nitric oxide synthase (nNOS), are the promising therapeutic targets for chronic pain.

Social Determinants and Consequences of Pain: Toward Multilevel, Intersectional, and Life Course Perspectives

Despite wide endorsement of a biopsychosocial framework for pain, social aspects of pain remain rarely addressed in the context of pain prevention and management. In this review, we aim to 1) examine the broad scope of social determinants and consequences of pain and their interactions across multiple levels of organization, and 2) provide a framework synthesizing existing concepts and potential areas for future work on social aspects of pain, drawing upon socioecological, intersectional, and life course approaches. Integrating interdisciplinary theory and evidence, we outline pathways through which multilevel social factors and pain may affect each other over time. We also provide a brief summary of intrapersonal aspects of pain, which are thought to operate at the interface between individuals and the social context. Progressing from micro- to macrolevel factors, we illustrate how social determinants of pain can directly or indirectly contribute to pain experiences, expression, risk, prognosis, and impact across populations. We consider 1) at the interpersonal level, the roles of social comparison, social relatedness, social support, social exclusion, empathy, and interpersonal conflict; 2) at the group or community level, the roles of intimacy groups, task groups, social categories, and loose associations; and 3) at the societal level, the roles of political, economic, and cultural systems, as well as their policies and practices. We present examples of multilevel consequences of pain across these levels and discuss opportunities to reduce the burden and inequities of pain by expanding multilevel social approaches in pain research and practice. PERSPECTIVE: Despite wide endorsement of a biopsychosocial framework for pain, social aspects of pain are often unclearly defined, hindering their use in pain prevention, management, and research. We summarize the scope of social aspects of pain and provide a framework synthesizing existing concepts and potential areas for future work.

Longitudinal examination of associations with the onset of pediatric chronic pain at different pain locations

ABSTRACT

Chronic pain is a frequent phenomenon in pediatrics. Little research explores whether there are factors that uniquely predict or accompany the onset of new chronic pain in different locations of the body. In this study, we report pediatric pain data for 3 location subsamples-headache, abdominal pain, and musculoskeletal pain-of a large secondary school sample (N = 2280). We distinguished between participants who experienced an onset of chronic pain and participants who had no chronic pain at the respective pain location within a 1-year period. We used regression and multilevel models to compare the 2 groups regarding factors previously associated with chronic pain. Our results indicate that irrespective of location, the onset of chronic pain is predicted by psychosocial factors, in particular, symptoms of depression (odds ratio [OR] = 1.13-1.17, P < 0.01) and anxiety (OR = 1.12-1.21, P < 0.05). Although the onset of headache is predicted by psychosocial factors only, the onsets of abdominal and musculoskeletal pain are additionally predicted by physiological factors such as level of physical activity. Many of the predictors were also accompanying factors. Regarding chronic abdominal pain, sleep deficiency did not predict pain onset but was a co-occurring phenomenon. Our findings underline the importance of mental health factors in the pain onset at all 3 body locations, whereas in chronic abdominal and musculoskeletal pain, physiological factors should also be considered. Measures of model fit, however, indicate that the occurrence of chronic pain is more complex and not well predicted by these factors alone.

Risk of Unfavorable Trajectories of Chronic Pain Severity-Results of a Longitudinal Study in School Children

Chronic pain is a common burden among children and adolescents associated with impairments in many aspects of life. Higher pain severity increases this burden. Subsequently, it is important to identify factors predicting the course of pain severity, classified by the chronic pain grading (CPG). In a 1-year longitudinal assessment of a general school-age population (N = 2,280), we aimed to identify biopsychosocial factors associated with CPG trajectories. We focused on children and adolescents who reported chronic pain at the start of the year (N = 689). Using longitudinal latent class analysis, we identified 3 classes of CPG trajectories over 1 year: 1) the "pain recovery group" exhibited initially moderate CPG scores that rapidly and consistently declined to a pain-free level, 2) the "continuously moderate pain severity group" displayed initially high CPG levels with a mild decline over time, and 3) the "continuously low pain severity group" had initially moderate CPG levels, which only slightly declined. In comparison to the pain recovery group, the continuously moderate pain severity group presented with heightened levels of anxiety (odds ratio [OR] = 1.12, 95% confidence interval [CI] [1.02, 1.24], P = .023), depression (OR = 1.10, 95% CI [1.01, 1.19], P = .029), and affective pain perception (OR = 1.10, 95% CI [1.02, 1.18], P = .010) and were more likely to be female (OR = 2.14, 95% CI [1.05, 4.35], P = .036). The continuously low pain severity group was predominantly female (OR = 1.65, 95% CI [1.10, 2.49], P = .016) compared to the pain recovery group. In conclusion, girls and individuals with impaired psychological well-being more often exhibit unfavorable trajectories of chronic pain severity. PERSPECTIVE: Pediatric chronic pain patients, particularly females and those exhibiting elevated anxiety or depression scores or heightened affective pain perception warrant special attention in health care. These individuals have a greater risk of an unfavorable trajectory of chronic pain severity and might need more urgent and specialized treatment.

The Neurostimulation Appropriateness Consensus Committee (NACC)®: Recommendations for the Mitigation of Complications of Neurostimulation

INTRODUCTION

The International Neuromodulation Society convened a multispecialty group of physicians based on expertise and international representation to establish evidence-based guidance on the mitigation of neuromodulation complications. This Neurostimulation Appropriateness Consensus Committee (NACC)® project intends to update evidence-based guidance and offer expert opinion that will improve efficacy and safety.

MATERIALS AND METHODS

Authors were chosen on the basis of their clinical expertise, familiarity with the peer-reviewed literature, research productivity, and contributions to the neuromodulation literature. Section leaders supervised literature searches of MEDLINE, BioMed Central, Current Contents Connect, Embase, International Pharmaceutical Abstracts, Web of Science, Google Scholar, and PubMed from 2017 (when NACC last published guidelines) to October 2023. Identified studies were graded using the United States Preventive Services Task Force criteria for evidence and certainty of net benefit. Recommendations are based on the strength of evidence or consensus when evidence was scant.

RESULTS

The NACC examined the published literature and established evidence- and consensus-based recommendations to guide best practices. Additional guidance will occur as new evidence is developed in future iterations of this process.

CONCLUSIONS

The NACC recommends best practices regarding the mitigation of complications associated with neurostimulation to improve safety and efficacy. The evidence- and consensus-based recommendations should be used as a guide to assist decision-making when clinically appropriate.

Parent Anxiety, Depression, Protective Responses, and Parenting Stress in the Context of Parent and Child Chronic Pain: A Daily Diary Study of Parent Variability

Parents with (vs without) chronic pain report poorer psychosocial functioning (eg, worse mental health, parenting difficulties), which has been linked to poorer child outcomes (eg, child pain). However, emerging research suggests that individuals vary in their functioning from day-to-day, particularly those with chronic pain. This study used daily diaries to compare parents with (versus without) chronic pain on variability in their anxiety, mood, protective responses, and parenting stress. We also examined parent chronic pain status as a moderator of the associations between parent variability and youth daily pain and interference. Participants were 76 youth with chronic pain (Mage = 14.26; 71.1% female) and one of their parents (89.5% mothers; n = 38 or 50.0% endorsing chronic pain). Parents and youth completed self-report questionnaires and 7 days of diaries. Parent variability was calculated to reflect the frequency and size of day-to-day changes. Multilevel models revealed that parents with (vs without) chronic pain were significantly more variable in their parenting stress, but not in their anxiety, mood, or protective responses. Contrary to hypotheses, parent variability was not significantly related to youth daily pain intensity or interference and parent chronic pain did not moderate any associations. Instead, mean levels of parent anxiety, protective responses, and parenting stress across the week significantly predicted youth daily pain interference. Findings suggest that while variability was observed among parents (with and without chronic pain) of youth with chronic pain, it did not significantly predict youth's daily pain-related functioning. Further research is needed to confirm these initial findings. PERSPECTIVE: Parents with chronic pain have expressed concerns that the variable nature of their pain negatively impacts their children. Our results found that parents (with and without chronic pain) were variable in their anxiety, mood, protective responses, and parenting stress, but this variability did not significantly predict youth's chronic pain-related functioning.

Pain and Post-traumatic Stress Disorder Symptoms: Dyadic Relationships Between Canadian Armed Forces Members/Veterans With Chronic Pain and Their Offspring

Chronic pain and mental health issues occur at higher rates in Veterans than the general population. One widely recognized mental health issue faced by Veterans is post-traumatic stress disorder (PTSD). Trauma symptoms and pain frequently co-occur and are mutually maintained due to shared mechanisms. Many Veterans are also parents. Parental physical and mental health issues significantly predict children's chronic pain and related functioning, which can continue into adulthood. Only 1 U.S.-based study has examined pain in the offspring of Veterans, suggesting a heightened risk for pain. Research to date has not examined the associations between trauma and pain and the dyadic influences of these symptoms, among Veterans, and their children. The current study aimed to describe pain characteristics in Canadian Armed Forces Members/Veterans with chronic pain and their offspring (youth and adult children aged 9-38). Cross-lagged panel models were conducted to examine dyadic relationships between pain interference and trauma symptoms of Canadian Armed Forces Members/Veterans and their offspring. Over half of adult offspring and over one-quarter of youth offspring reported chronic pain. Results revealed effects between one's own symptoms of PTSD and pain interference. No significant effects of parents on offspring or offspring on parents were found. The findings highlight the interconnection between pain and PTSD consistent with mutual maintenance models and a lack of significant interpersonal findings suggestive of resiliency in this unique population. PERSPECTIVE: We characterized chronic pain in the offspring of Canadian Armed Forces Members/Veterans with chronic pain and examined dyadic relationships between PTSD symptoms and chronic pain interference. Findings revealed that PTSD symptoms and pain interference were related within Veterans and offspring, but no dyadic relationships were found, which could reflect resiliency.

The association between parent mental health and pediatric chronic pain: a systematic review and meta-analysis

ABSTRACT

Mental health problems are common among parents of children with chronic pain and associated with worse outcomes for the child with chronic pain. However, the effect sizes of these associations between parent mental health and pediatric chronic pain vary widely across studies. The aim of this systematic review and meta-analysis was to generate pooled estimates of the (1) prevalence of mental health problems among parents of children with chronic pain and (2) associations between parent mental health and the (2a) presence of child chronic pain and (2b) functioning of children with chronic pain. Embase, MEDLINE, PsycINFO, Web of Science, and CINAHL were searched up to November 2022. Observational studies that examined symptoms or diagnoses of parent anxiety, depression, or general distress and the presence of child chronic pain and/or related functioning were included. From 32,848 records, 2 coders identified 49 studies to include in random-effects meta-analyses. The results revealed that mental health problems among parents of children with chronic pain were common (anxiety: 28.8% [95% CI 20.3-39.1]; depression: 20.0% [15.7-25.2]; general distress: 32.4% [22.7-44.0]). Poorer parent mental health was significantly associated with the presence of chronic pain (anxiety: OR = 1.91 [1.51-2.41]; depression: OR = 1.90 [1.51-2.38]; general distress: OR = 1.74 [1.47-2.05]) and worse related functioning (ie, pain intensity, physical functioning, anxiety and depression symptoms; r s = 0.10-0.25, all P s < 0.05) in children. Moderator analyses were generally nonsignificant or could not be conducted because of insufficient data. Findings support the importance of addressing parent mental health in the prevention and treatment of pediatric chronic pain.

Predictors and concomitants of the remission of frequent headache in pediatrics: A longitudinal community study

OBJECTIVE

We aimed to examine factors associated with frequent headache remission in schoolchildren aged 10-18 years.

BACKGROUND

Frequent headache is a common health problem in adolescence, and some individuals in this population experience remission. Factors preceding headache remission as opposed to ongoing headache, and their development over time, have not been examined extensively.

METHODS

Data were derived from a large school sample (N = 2280). Over the course of 1 year, n = 156 adolescents experienced remission from frequent headaches, while n = 125 adolescents continued to have frequent headaches throughout the year. In this longitudinal case-control study, we predicted headache remission using demographic, pain, psychosocial, sleep, and physiological characteristics. Additionally, we sought to explore the development of psychosocial, sleep, and physiological characteristics in relation to remitted versus ongoing headache over the 1-year period.

RESULTS

A model containing the variables sex (odds ratio [OR] = 0.43, 95% confidence interval [CI] = 0.248-0.76, p = 0.003), headache intensity (OR = 0.85, 95% CI = 0.73-0.99, p = 0.035), anxiety score (OR = 0.92, 95% CI = 0.85-1.01, p = 0.071), and depression score (OR = 0.94, 95% CI = 0.89-1.00, p = 0.041) predicted the outcome variable (remitted vs. non-remitted headache), explaining 17% of the variance in group membership. Schoolchildren reporting remitted headache at the end of the year exhibited lower depression (F[1, 557.01] = 45.77, p < 0.001) and anxiety scores (F[1, 557.01] = 21.72, p < 0.001), higher school satisfaction (F[1, 209.46] = 7.15, p = 0.008), and fewer difficulties falling asleep (F[1, 856.52] = 41.21, p < 0.001) or sleeping through the night (F[1, 731.12] = 26.42, p < 0.001) throughout the year compared to those with non-remitted headache. Depression scores declined significantly over the year in the group with remitted headache, whereas these scores remained constant in the group with non-remitted headache.

CONCLUSION

Our results suggest a correlation between headache remission and male sex, improved mental health, and reduced pain-related burden. Moreover, there was an observed decline in symptoms of depression during headache remission. Psychotherapy may be a promising treatment strategy for addressing frequent headaches reported by children and adolescents.

Exploring the Lived Experiences of Pain in Military Families: A Qualitative Examination

Chronic pain in Canadian Veterans is twice that of the general population and the prevalence of their related mental health concerns is alarmingly high. This likely puts their children at an increased risk of developing pain and mental health problems that can pervasively impact daily life and persist into adulthood. Pain care and military culture of (acute and chronic) pain have been identified as a top priority of Canadian Veterans. This study aimed to gain an in-depth understanding of the pain experiences of Canadian Armed Forces families. Thirty-five semi-structured qualitative interviews were conducted. Demographic information was collected; age, gender, and ethnicity were reported. Twelve Canadian Armed Forces members/Veterans, 17 youth, and 6 spouses were interviewed. Ninety-two percent of Veteran participants reported chronic pain. Reflexive thematic analyses generated four themes: 1) Military mindset: herd culture and solider identity, 2) The culture of pain within military families, 3) Inseparability of mental health and pain, and 4) Breaking the cycle and shifting the military mindset. Military culture and identity create a unique context within which pain expression and experience is integrally shaped within these families. This study sheds light on how pain is experienced and perceived within military families and can inform research on and efforts to foster resilience in these families. PERSPECTIVE: This is the first qualitative study to explore the lived experiences of pain in Canadian military families. Findings underscore the key role that military culture and identity plays in how pain is experienced and perceived in all family members.

A Parent-Targeted Group Intervention for Pediatric Pain Delivered In-Person or Virtually: Feasibility, Acceptability, and Effectiveness

OBJECTIVES

Parents play integral roles in their youth's chronic pain and can experience elevated distress related to caregiving. This study examined a cognitive-behavior therapy-based parent-targeted group intervention, including understudied/novel resilience/risk (eg, distress, parenting self-regulation), and compared the effect of in-person versus virtual delivery format.

HYPOTHESES

(1) Adequate feasibility and acceptability (enrolment>33%, attendance >60%, attrition <25%, satisfaction ratings >90%), with higher indicators of feasibility in the virtual groups; (2) Significant improvements in parent psychological flexibility, protectiveness, distress, and parenting self-regulation at posttreatment that were maintained at follow-up, with no difference between delivery type.

METHODS

Parents were enroled from an outpatient pediatric chronic pain clinic and participated in the group intervention in-person or virtually; questionnaires were completed at baseline, posttreatment, and 3-month follow-up.

RESULTS

Enrolment (55% in-person, 65% virtual) and attendance (86% in-person, 93% virtual) were higher, and attrition was lower than expected (4% in-person, 7% virtual). Satisfaction was high (4.95/5 in-person, 4.85/5 virtual); on written feedback, parents enjoyed connecting with other parents (27/56, 48%) the most. The least preferred were the virtual format (5/36, 14%) and timing of the group (6/52, 12%). There were no differences between delivery formats in feasibility/acceptability. The intervention significantly improved parents' psychological flexibility, protectiveness, distress, and parenting self-regulation over time. A small group difference favored the in-person format for psychological flexibility, and an interaction effect for parenting self-regulation was found.

DISCUSSION

This standalone parent-targeted group intervention had positive effects on parent outcomes delivered either in-person or virtually.

Pain, depressive symptoms, and health-related quality of life among survivors of pediatric hematopoietic stem cell transplant

OBJECTIVE

Pediatric hematopoietic stem cell transplant (HCT) is an intensive medical procedure associated with significant late effects, of which pain is a prominent example. While pain is associated with increased depressive symptoms and health-related quality-of-life (HRQoL) impairments in other pediatric chronic illness populations, associations between these variables are not well understood in pediatric HCT. Clarifying these associations may inform clinical interventions to improve health outcomes following pediatric HCT. This study aimed to investigate the relations between pain intensity, depressive symptoms, and HRQoL in survivors of pediatric HCT.

METHOD

Fifty-one survivors of pediatric HCT (Mage  = 14.3 years, standard deviation [SD] = 4.3; 58.8% male; 80.4% White) completed self-report measures of pain intensity, depressive symptoms, and HRQoL. Demographic and disease information was collected via demographic forms and medical record review. Path analysis was used to examine hypothesized associations between pain intensity, depressive symptoms, and HRQoL.

RESULTS

Analyses revealed direct effects of pain intensity on depressive symptoms (estimate [Est.] = .23, p < .001) and HRQoL (Est. = -.2, p = .04), and direct effects of depressive symptoms on HRQoL (Est. = -.68, p < .001). Depressive symptoms also mediated the relationship between pain intensity and HRQoL (Est. = -.16, p = .006).

CONCLUSIONS

Greater pain intensity was associated directly with increased depressive symptoms and indirectly with HRQoL through depressive symptoms. Results of this study suggest that multitargeted cognitive behavioral interventions that address pain and depressive symptoms may improve HRQoL ratings in survivors of pediatric HCT.

Cutting the cord? Parenting emerging adults with chronic pain

The role of parent factors, such as distress and protective behaviors, on pain and functional outcomes of emerging adults living with chronic pain has been largely unexplored. The effects of helicopter parenting and developmental changes occurring during this transition period between adolescence and adulthood (commonly defined as the ages between 18 and 30 years) may exacerbate the pain experience and have the potential to influence chronic pain management. Clinical practice, with an additional focus on supporting the parent(s), may aid in meeting the needs of this population. In this paper, we review the available literature on (a) the socio-cultural shift in parenting over the past decade with a focus on helicopter parenting; (b) the impact of this parenting style on the pain experience and outcomes of emerging adults living with chronic pain; (c) provide recommendations for chronic pain management with a focus on the parent-emerging adult dyad; and (d) conclude with future research recommendations. This narrative review is the first to consider the impacts and outcomes of helicopter parenting on emerging adults with chronic pain.

Comorbidity and familial aggregation of back/neck pain in the NIMH Family Study of Affective Spectrum Disorders

OBJECTIVE

Back pain is associated with substantial Global Burden of Disease and is highly comorbid with mood and anxiety symptoms and syndromes. However, mechanisms underlying this association have not been well-elucidated. Here we apply data from the NIMH Family Study of Affective Spectrum Disorders to investigate the comorbidity, familial aggregation, and cross-aggregation of back/neck pain with mood disorder subtypes.

METHODS

The sample includes 519 probands and 560 interviewed first-degree relatives. Lifetime DSM-IV Bipolar I, Bipolar II, and Major Depressive Disorder [MDD] were derived from semi-structured diagnostic interviews. Lifetime history of back or neck pain and its age of onset were self-reported retrospectively. Familial aggregation and cross-aggregation were estimated via mixed effects models in probands and interviewed first-degree relatives, while heritability and co-heritability (endophenotypic ranking value [ERV]) were estimated using full pedigrees.

RESULTS

Over 45% of participants endorsed a history of back/neck pain. Back/neck pain was familial (adjusted odds ratio [aOR] 1.5, p = 0.04; h2 = 0.24, p = 0.009). Back/neck pain in probands was associated with MDD in relatives (aOR 1.5, p = 0.04; ERV = 0.17, p = 0.024), but not with bipolar disorder. Onset of back/neck pain occurred earlier in those with bipolar disorder compared to controls.

CONCLUSION

Findings suggest common familial risk factors underlying back/neck pain with MDD, whereas there was within-individual comorbidity of bipolar with back/neck pain. Future studies that identify common factors that lead to either back/neck pain or MDD can inform prevention and interventions.

Sodium Benzoate—Harmfulness and Potential Use in Therapies for Disorders Related to the Nervous System: A Review

Currently, due to the large number of reports regarding the harmfulness of food additives, more and more consumers follow the so-called “clean label” trend, i.e., prefer and choose the least-processed food products. One of the compounds known as a preservative with a high safety profile is sodium benzoate. While some studies show that it can be used to treat conditions such as depression, pain, schizophrenia, autism spectrum disorders, and neurodegenerative diseases, others report its harmfulness. For example, it was found to cause mutagenic effects, generate oxidative stress, disrupt hormones, and reduce fertility. Due to such disparate results, the purpose of this study is to comprehensively discuss the safety profile of sodium benzoate and its potential use in neurodegenerative diseases, especially in autism spectrum disorder (ASD), schizophrenia, major depressive disorder (MDD), and pain relief.

Unified Multifactorial Model of Parental Factors in Community-Based Pediatric Chronic Pain

OBJECTIVE

The combination of parental chronic pain and internalizing characteristics are relevant to chronic pain experiences in their children. A promising unified multifactorial intergenerational model of chronic pain was published in 2019; however, this model was only generalizable to children with severe chronic pain and some factors had limitations. This study aimed to determine validity of an adapted multifactorial model, including parent and child chronic pain status, pain characteristics, pain-related functioning, and internalizing symptoms, in a community setting. Subgroup analyses based on presence of chronic pain in parents and children were explored to determine whether effects were stronger in certain subsamples.

METHODS

Adolescents (N = 1,450, Mage=12.7 years, 50% female), and their parents (82% mothers), were recruited from five schools to complete online surveys. Structural equation modeling was used to investigate interrelated pain-related experiences between parents and their offspring.

RESULTS

The adapted unified multifactorial model had good model fit in the community sample. Significant weak associations were found between all parent and child factors. The strongest associations were found in the subsample of parents and children with chronic pain. In all subgroups, internalizing factors were the most strongly linked intergenerational constructs.

CONCLUSIONS

Our results support the validity of the unified multifactorial model of parental factors in pediatric chronic pain, although associations were weaker in the community sample than those previously reported in a clinical sample. In children who develop chronic pain, it is important to consider their parent's chronic pain and internalizing symptoms to best manage intergenerational effects.