Heightened healthcare utilization & risk of mental disorders among Veterans with comorbid opioid use disorder & posttraumatic stress disorder

Genome-wide association analyses identify 95 risk loci and provide insights into the neurobiology of post-traumatic stress disorder

Post-traumatic stress disorder (PTSD) genetics are characterized by lower discoverability than most other psychiatric disorders. The contribution to biological understanding from previous genetic studies has thus been limited. We performed a multi-ancestry meta-analysis of genome-wide association studies across 1,222,882 individuals of European ancestry (137,136 cases) and 58,051 admixed individuals with African and Native American ancestry (13,624 cases). We identified 95 genome-wide significant loci (80 new). Convergent multi-omic approaches identified 43 potential causal genes, broadly classified as neurotransmitter and ion channel synaptic modulators (for example, GRIA1, GRM8 and CACNA1E), developmental, axon guidance and transcription factors (for example, FOXP2, EFNA5 and DCC), synaptic structure and function genes (for example, PCLO, NCAM1 and PDE4B) and endocrine or immune regulators (for example, ESR1, TRAF3 and TANK). Additional top genes influence stress, immune, fear and threat-related processes, previously hypothesized to underlie PTSD neurobiology. These findings strengthen our understanding of neurobiological systems relevant to PTSD pathophysiology, while also opening new areas for investigation.

The Exploration of the GWOT Combat Amputee's Experience With Longitudinal Care: A Qualitative Study

INTRODUCTION

Contemporary advances in combat medicine have allowed greater numbers of wounded service members to survive their injuries. An estimated 1,705 combat veterans sustained major lower or upper extremity amputations between 2001 and 2017 during the Global War on Terror. This study intends to answer the following question utilizing a qualitative study design: What were the common and abnormal experiences of the Global War on Terror combat amputees relative to their mechanism of injury, perception of injury, and systems of care utilized during their recovery and rehabilitation process?.

METHODS

During the months of December 2022 and January 2023, individual semi-structured interviews were conducted with U.S. Marines that served in the Global War on Terror (total n = 10). Deductive and inductive approaches were employed to identify codes, themes, and meta-themes in the data.

RESULTS

All participants deployed to Afghanistan between the years 2010 and 2014 and were assigned to the following military occupational specialties: Explosive Ordnance Disposal technicians (total n = 2); combat engineers (total n = 2); and infantrymen (total n = 6). Analysis of data collected from interviews highlighted these key observations: (1) Themes in the combat amputee experience include support, systems of care, and mindset and (2) the themes synergistically contribute to the meta-themes mental health and pain and vice versa. As all participants were subjected to a blast mechanism of injury, it is difficult to determine if this played a role in deviating rehabilitation and recovery processes. Perception of injury and how well participants adapted to their new lifestyle, meaning how optimistic they were, appeared to play a significant role in recovery. Participants had mixed feelings about the care they had received but generally spoke favorably of military hospitals and were frustrated with the Veteran Affairs, and there was no clear consensus on their relationship with civilian health care, though most participants chose to seek most of their care through the Veteran Affairs.

CONCLUSION

Based on the research question, this study found an intricate relationship between mental health, pain, and the experiences of the participants regarding their care and rehabilitation. However, the nature of qualitative research makes it impossible to determine generalizations that can be used to create meaningful change to address improving combat amputee veteran care. Further research into long-term health outcomes based on hypotheses not evaluated in existing literature would further improve the ability of health care providers to care for this unique patient population.

Management of Chronic Pain and PTSD in Veterans With tDCS+Prolonged Exposure: A Pilot Study

INTRODUCTION

Chronic pain and posttraumatic stress disorder (PTSD) are prevalent comorbid conditions, particularly in Veterans; however, there are few integrated treatments for chronic pain and PTSD. Instead, interventions are typically implemented separately and may involve addictive opioids. Although there are highly effective, non-pharmacological treatments for PTSD, they are plagued by high dropout, which may be exacerbated by comorbid pain, as these PTSD treatments typically require increased activity. Importantly, a noninvasive pain treatment, tDCS (transcranial direct current stimulation) shows indications of effectiveness and may be integrated with psychological treatments, even when delivered via telehealth. This study examines the feasibility and initial efficacy of integrating home telehealth tDCS with prolonged exposure (PE), an evidence-based PTSD treatment.

MATERIALS AND METHODS

Thirty-nine Veterans were contacted, 31 consented to evaluation, 21 were enrolled, and 16 completed treatment and provided pre- and post-treatment data at one of two Veterans Affairs Medical Centers. Transcranial direct current stimulation sessions corresponded with PE exposure assignments, as there is theoretical reason to believe that tDCS may potentiate extinction learning featured in PE.

RESULTS

Patients evinced significant improvement in both pain interference and PTSD symptoms and a trend toward improvement in depression symptoms. However, a significant change in pain intensity was not observed, likely because of the small sample size.

DISCUSSION

The findings provide initial support for the feasibility of an entirely home-based, integrated treatment for comorbid PTSD and pain.

Discovery of 95 PTSD loci provides insight into genetic architecture and neurobiology of trauma and stress-related disorders

Posttraumatic stress disorder (PTSD) genetics are characterized by lower discoverability than most other psychiatric disorders. The contribution to biological understanding from previous genetic studies has thus been limited. We performed a multi-ancestry meta-analysis of genome-wide association studies across 1,222,882 individuals of European ancestry (137,136 cases) and 58,051 admixed individuals with African and Native American ancestry (13,624 cases). We identified 95 genome-wide significant loci (80 novel). Convergent multi-omic approaches identified 43 potential causal genes, broadly classified as neurotransmitter and ion channel synaptic modulators (e.g., GRIA1, GRM8, CACNA1E ), developmental, axon guidance, and transcription factors (e.g., FOXP2, EFNA5, DCC ), synaptic structure and function genes (e.g., PCLO, NCAM1, PDE4B ), and endocrine or immune regulators (e.g., ESR1, TRAF3, TANK ). Additional top genes influence stress, immune, fear, and threat-related processes, previously hypothesized to underlie PTSD neurobiology. These findings strengthen our understanding of neurobiological systems relevant to PTSD pathophysiology, while also opening new areas for investigation.

Association of Potential for Deaths of Despair With Age and Military Service Era

INTRODUCTION

Predictors of deaths of despair, including substance use disorder, psychological distress, and suicidality, are known to be elevated among young adults and recent military veterans. Limited information is available to distinguish age effects from service-era effects. We assessed these effects on indicators of potential for deaths of despair in a large national sample of U.S. adults aged ≥19 years.

MATERIALS AND METHODS

The study was a retrospective, cross-sectional analysis of publicly available data for 2015-2019 from 201,846 respondents to the National Survey on Drug Use and Health (NSDUH), which measures psychological symptoms and substance use behaviors using standardized scales and diagnostic definitions. Indicators of potential for a death of despair included liver cirrhosis, past-year serious suicidal ideation, serious psychological distress per the Kessler-6 scale, and active substance use disorder (e.g., binge drinking on ≥5 occasions in the past month, nonmedical use of prescribed controlled substances, and illicit drug use). Bivariate, age-stratified bivariate, and multivariate logistic regression analyses were performed using statistical software and tests appropriate for the NSDUH complex sampling design. Covariates included demographic characteristics, chronic conditions, and religious service attendance.

RESULTS

Indicators were strongly and consistently age-associated, with ≥1 indicator experienced by 45.5% of respondents aged 19-25 years and 10.7% of those aged ≥65 years (P < .01). After age stratification, service-era effects were modest and occurred only among adults aged ≥35 years. The largest service-associated increase was among adults aged 35-49 years; service beginning or after 1975 was associated (P < .01), with increased prevalence of ≥1 indicator (30.2%-34.2% for veterans and 25.2% for nonveterans) or ≥2 indicators (6.4%-8.2% for veterans and 5.4% for nonveterans). Covariate-adjusted results were similar, with adjusted probabilities of ≥1 indicator declining steadily with increasing age: among those 19-34 years, 39.9% of nonveterans and 42.2% of Persian Gulf/Afghanistan veterans; among those aged ≥65 years, 10.3% of nonveterans, 9.2% of World War II/Korea veterans, and 14.4% of Vietnam veterans.

CONCLUSIONS

After accounting for age, military service-era effects on potential for a death of despair were modest but discernible. Because underlying causes of deaths of despair may vary by service era (e.g., hostility to Vietnam service experienced by older adults versus environmental exposures in the Persian Gulf and Afghanistan), providers treating veterans of different ages should be sensitive to era-related effects. Findings suggest the importance of querying for symptoms of mental distress and actively engaging affected individuals, veteran or nonveteran, in appropriate treatment to prevent deaths of despair.