Microglia-mediated neuroimmune suppression in PTSD is associated with anhedonia.

Dynamic brain immune function in individuals with posttraumatic stress disorder is rarely studied, despite evidence of peripheral immune dysfunction. Positron emission tomography brain imaging using the radiotracer [11C]PBR28 was used to measure the 18-kDa translocator protein (TSPO), a microglial marker, at baseline and 3 h after administration of lipopolysaccharide (LPS), a potent immune activator. Data were acquired in 15 individuals with PTSD and 15 age-matched controls. The PTSD group exhibited a significantly lower magnitude LPS-induced increase in TSPO availability in an a priori prefrontal-limbic circuit compared to controls. Greater anhedonic symptoms in the PTSD group were associated with a more suppressed neuroimmune response. In addition, while a reduced granulocyte-macrophage colony-stimulating factor response to LPS was observed in the PTSD group, other measured cytokine responses and self-reported sickness symptoms did not differ between groups; these findings highlight group differences in central-peripheral immune system relationships. The results of this study provide evidence of a suppressed microglia-mediated neuroimmune response to a direct immune system insult in individuals with PTSD that is associated with the severity of symptoms. They also provide further support to an emerging literature challenging traditional concepts of microglial and immune function in psychiatric disease.

Co-occurring Chronic Pain and PTSD Among US Military Veterans: Prevalence, Correlates, and Functioning.

BACKGROUND: The prevalence of co-occurring chronic pain and posttraumatic stress disorder (PTSD) has yet to be established in a nationally representative sample of US veterans, and little is known about the individual contributing roles of these disorders to the psychiatric and functional burden of this comorbidity. OBJECTIVE: To determine the prevalence of chronic pain, PTSD, and co-occurring chronic pain and PTSD, and psychiatric comorbidities and psychosocial functioning in these groups. DESIGN: Data were analyzed from the National Health and Resilience in Veterans Study, which surveyed a nationally representative sample of US veterans. PARTICIPANTS: Veterans (n=4069) were classified into four groups: control (i.e., no PTSD or chronic pain), chronic pain only, PTSD only, and co-occurring chronic pain and PTSD. MAIN MEASURES: A probable PTSD diagnosis was established using the PTSD Checklist for DSM-5, and a chronic pain diagnosis using a self-report item that queried health care professional diagnoses. Psychiatric and functional status were assessed using the Patient Health Questionnaire-4, Alcohol Use Disorders Identification Test, Screen of Drug Use, Suicide Behaviors Questionnaire-Revised, Short Form Health Survey-8, Brief Inventory of Psychosocial Functioning, and Medical Outcomes Study Cognitive Functioning Scale. KEY RESULTS: A total of 3.8% of veterans reported both probable PTSD and a diagnosis of chronic pain. Relative to veterans with chronic pain alone, those with co-occurring chronic pain and probable PTSD were more likely to screen positive for psychiatric disorders (odds ratios [ORs]=2.59-9.88) and scored lower on measures of psychosocial functioning (Cohen's ds=0.38-1.43). Relative to veterans with probable PTSD only, those with co-occurring chronic pain and probable PTSD were more likely to have attempted suicide (OR=4.79; 95%CI, 1.81-12.69). CONCLUSIONS: Results underscore the importance of whole health care that considers a broad range of health and functional domains in the assessment and treatment of co-occurring chronic pain and PTSD in veterans.

Psychological Burden of Systemic Racism-Related Distress in New York City Healthcare Workers During the COVID-19 Pandemic.

BACKGROUND: Little is known about the relationship among systemic racism, psychological symptoms (depression, anxiety, and/or post-traumatic stress disorders), and burnout in healthcare workers (HCWs). OBJECTIVE: To determine whether distress related to awareness of systemic racism contributes to psychological symptoms and/or burnout in HCWs. We explored whether this form of racism-related distress may moderate the relationship between race, ethnicity, psychological symptoms, and burnout. DESIGN: A cross-sectional survey was conducted from November 19, 2020, through January 11, 2021. Statistical analysis was conducted from May 3, 2022, to June 15, 2022. PARTICIPANTS: Frontline HCWs at an urban tertiary care hospital in New York City. MAIN MEASURES: Distress related to awareness of systemic racism (SR) and racial disparities in COVID-19 outcomes (RD), psychological symptoms, and burnout. KEY RESULTS: Two thousand one of 4654 HCWs completed the survey (response rate 43.0%). Most HCWs reported experiencing distress related to awareness of systemic racism (1329 [66.4%]) and to racial disparities in COVID-19 outcomes (1137 [56.8%]). Non-Hispanic Black participants (SR odds ratio (OR) 2.84, p < .001; RD OR 2.34, p < .001), women (SR OR 1.35, p = .01; RD OR 1.67, p < .001), and those with history of mental illness (SR OR 2.13, p < .001; RD OR 1.66, p < .001) were more likely to report SR- and RD-related distress, respectively. HCWs who experienced "quite-a-bit to extreme" SR-related distress were more likely to screen positive for psychological symptoms (OR 5.90, p < .001) and burnout (OR 2.26, p < .001). CONCLUSIONS: Our findings suggest that distress related to awareness of systemic racism, not race/ethnicity, was associated with experiencing psychological symptoms and burnout in HCWs. As the medical community continues to critically examine the role of systemic racism in healthcare, our work is a first step in characterizing its toll on the psychological well-being of HCWs.

Genetic and non-genetic predictors of risk for opioid dependence.

BACKGROUND: Elucidation of the interaction of biological and psychosocial/environmental factors on opioid dependence (OD) risk can inform our understanding of the etiology of OD. We examined the role of psychosocial/environmental factors in moderating polygenic risk for opioid use disorder (OUD). METHODS: Data from 1958 European ancestry adults who participated in the Yale-Penn 3 study were analyzed. Polygenic risk scores (PRS) were based on a large-scale multi-trait analysis of genome-wide association studies (MTAG) of OUD. RESULTS: A total of 420 (21.1%) individuals had a lifetime diagnosis of OD. OUD PRS were positively associated with OD (odds ratio [OR] 1.42, 95% confidence interval [CI] 1.21-1.66). Household income and education were the strongest correlates of OD. Among individuals with higher OUD PRS, those with higher education level had lower odds of OD (OR 0.92, 95% CI 0.85-0.98); and those with posttraumatic stress disorder (PTSD) were more likely to have OD relative to those without PTSD (OR 1.56, 95% CI 1.04-2.35). CONCLUSIONS: Results suggest an interplay between genetics and psychosocial environment in contributing to OD risk. While PRS alone do not yet have useful clinical predictive utility, psychosocial factors may help enhance prediction. These findings could inform more targeted clinical and policy interventions to help address this public health crisis.

Associations of alcohol and cannabis use with change in posttraumatic stress disorder and depression symptoms over time in recently trauma-exposed individuals.

BACKGROUND: Several hypotheses may explain the association between substance use, posttraumatic stress disorder (PTSD), and depression. However, few studies have utilized a large multisite dataset to understand this complex relationship. Our study assessed the relationship between alcohol and cannabis use trajectories and PTSD and depression symptoms across 3 months in recently trauma-exposed civilians. METHODS: In total, 1618 (1037 female) participants provided self-report data on past 30-day alcohol and cannabis use and PTSD and depression symptoms during their emergency department (baseline) visit. We reassessed participant's substance use and clinical symptoms 2, 8, and 12 weeks posttrauma. Latent class mixture modeling determined alcohol and cannabis use trajectories in the sample. Changes in PTSD and depression symptoms were assessed across alcohol and cannabis use trajectories via a mixed-model repeated-measures analysis of variance. RESULTS: Three trajectory classes (low, high, increasing use) provided the best model fit for alcohol and cannabis use. The low alcohol use class exhibited lower PTSD symptoms at baseline than the high use class; the low cannabis use class exhibited lower PTSD and depression symptoms at baseline than the high and increasing use classes; these symptoms greatly increased at week 8 and declined at week 12. Participants who already use alcohol and cannabis exhibited greater PTSD and depression symptoms at baseline that increased at week 8 with a decrease in symptoms at week 12. CONCLUSIONS: Our findings suggest that alcohol and cannabis use trajectories are associated with the intensity of posttrauma psychopathology. These findings could potentially inform the timing of therapeutic strategies.

Structural inequities contribute to racial/ethnic differences in neurophysiological tone, but not threat reactivity, after trauma exposure.

Considerable racial/ethnic disparities persist in exposure to life stressors and socioeconomic resources that can directly affect threat neurocircuitry, particularly the amygdala, that partially mediates susceptibility to adverse posttraumatic outcomes. Limited work to date, however, has investigated potential racial/ethnic variability in amygdala reactivity or connectivity that may in turn be related to outcomes such as post-traumatic stress disorder (PTSD). Participants from the AURORA study (n = 283), a multisite longitudinal study of trauma outcomes, completed functional magnetic resonance imaging and psychophysiology within approximately two-weeks of trauma exposure. Seed-based amygdala connectivity and amygdala reactivity during passive viewing of fearful and neutral faces were assessed during fMRI. Physiological activity was assessed during Pavlovian threat conditioning. Participants also reported the severity of posttraumatic symptoms 3 and 6 months after trauma. Black individuals showed lower baseline skin conductance levels and startle compared to White individuals, but no differences were observed in physiological reactions to threat. Further, Hispanic and Black participants showed greater amygdala connectivity to regions including the dorsolateral prefrontal cortex (PFC), dorsal anterior cingulate cortex, insula, and cerebellum compared to White participants. No differences were observed in amygdala reactivity to threat. Amygdala connectivity was associated with 3-month PTSD symptoms, but the associations differed by racial/ethnic group and were partly driven by group differences in structural inequities. The present findings suggest variability in tonic neurophysiological arousal in the early aftermath of trauma between racial/ethnic groups, driven by structural inequality, impacts neural processes that mediate susceptibility to later PTSD symptoms.

Internal capsule microstructure mediates the relationship between childhood maltreatment and PTSD following adulthood trauma exposure.

Childhood trauma is a known risk factor for trauma and stress-related disorders in adulthood. However, limited research has investigated the impact of childhood trauma on brain structure linked to later posttraumatic dysfunction. We investigated the effect of childhood trauma on white matter microstructure after recent trauma and its relationship with future posttraumatic dysfunction among trauma-exposed adult participants (n = 202) recruited from emergency departments as part of the AURORA Study. Participants completed self-report scales assessing prior childhood maltreatment within 2-weeks in addition to assessments of PTSD, depression, anxiety, and dissociation symptoms within 6-months of their traumatic event. Fractional anisotropy (FA) obtained from diffusion tensor imaging (DTI) collected at 2-weeks and 6-months was used to index white matter microstructure. Childhood maltreatment load predicted 6-month PTSD symptoms (b = 1.75, SE = 0.78, 95% CI = [0.20, 3.29]) and inversely varied with FA in the bilateral internal capsule (IC) at 2-weeks (p = 0.0294, FDR corrected) and 6-months (p = 0.0238, FDR corrected). We observed a significant indirect effect of childhood maltreatment load on 6-month PTSD symptoms through 2-week IC microstructure (b = 0.37, Boot SE = 0.18, 95% CI = [0.05, 0.76]) that fully mediated the effect of childhood maltreatment load on PCL-5 scores (b = 1.37, SE = 0.79, 95% CI = [-0.18, 2.93]). IC microstructure did not mediate relationships between childhood maltreatment and depressive, anxiety, or dissociative symptomatology. Our findings suggest a unique role for IC microstructure as a stable neural pathway between childhood trauma and future PTSD symptoms following recent trauma. Notably, our work did not support roles of white matter tracts previously found to vary with PTSD symptoms and childhood trauma exposure, including the cingulum bundle, uncinate fasciculus, and corpus callosum. Given the IC contains sensory fibers linked to perception and motor control, childhood maltreatment might impact the neural circuits that relay and process threat-related inputs and responses to trauma.

Methyl Red Adsorption on Biochar Obtained by Physical Activation of Caraway Seeds with Carbon Dioxide.

In this study carbon adsorbents were produced from caraway (Carum carvi L.) seeds, through direct and physical activation by carbon dioxide. The resulting biochar adsorbents were analyzed using low-temperature nitrogen adsorption-desorption isotherms and Boehm titration. Furthermore, the acid-base properties of the biochar samples obtained were examined, and the pH of their aqueous extracts was determined. The obtained adsorbents had a specific surface area ranging between 10 to 70 m2 /g. Resulting carbon materials exhibited a predominance of basic groups on their surfaces. The sorption capacities of methyl red for the samples varied from 3 to 20 mg/g. Conducted adsorption studies determined, that the adsorption kinetics of the dye on biochar materials followed a pseudo-second order model and the adsorption process was best described by the Freundlich isotherm, indicating the development of a multi-layer adsorbate on their surfaces. The effectiveness of adsorption in aqueous solutions of methyl red increased with the rise in process temperature. Moreover, the adsorption process was found to be spontaneous and endothermic based on thermodynamic investigations.

Posttraumatic stress disorder and insomnia in US military veterans: Prevalence, correlates, and psychiatric and functional burden.

Military veterans have high rates of psychiatric conditions such as posttraumatic stress disorder, which can complicate the clinical management of insomnia. Population-based data are lacking on the prevalence, characteristics and mental health burden of veterans with co-occurring posttraumatic stress disorder and insomnia. The current cross-sectional study analysed data from a nationally representative sample of 4069 US veterans examining the prevalence and comorbidity between posttraumatic stress disorder and insomnia, and their associations with psychiatric and medical comorbidities, suicidality, and psychosocial functioning. Results revealed that 4.0% of US veterans screened positive for posttraumatic stress disorder + insomnia, 7.4% for insomnia only, and 3.2% for posttraumatic stress disorder only. Compared with controls, higher odds of major depressive disorder and generalized anxiety disorder were observed in the posttraumatic stress disorder + insomnia and posttraumatic stress disorder only groups. Moreover, compared with the control group, posttraumatic stress disorder + insomnia and posttraumatic stress disorder only groups had higher odds of current suicidal ideation, while the posttraumatic stress disorder + insomnia group had also higher odds of attempting suicide. Relative to the posttraumatic stress disorder only group, the posttraumatic stress disorder + insomnia group scored substantially lower on measures of cognitive, emotional and social functioning (d = 1.05, 1.04 and 0.87, respectively). This study provides contemporary data regarding current prevalence, correlates, and psychiatric and functional burden of posttraumatic stress disorder + insomnia among US veterans. The results underscore the importance of assessing, monitoring and treating posttraumatic stress disorder and insomnia as part of the efforts to mitigate suicide risk and promote multi-domain functioning in this population.

Negative aging stereotypes in U.S. military veterans: results from the National Health and Resilience in Veterans Study.

U.S. military veterans are an average 20 years older than non-veterans and have elevated rates of certain health conditions. While negative aging stereotypes have been linked to increased risk for various health conditions, little is known about the prevalence and correlates of these stereotypes in this population. Using data from a nationally representative sample of 4,069 U.S. veterans surveyed between 11/19 and 3/20, we examined (1) the current prevalence of negative aging stereotypes related to physical, mental, and cognitive health and (2) sociodemographic, health, and psychosocial factors associated with these stereotypes. Multivariable regression and relative weight analyses were conducted to identify independent correlates of negative aging stereotypes. Results revealed that 82.3%, 71.1%, and 30.0% of veterans endorsed negative aging stereotypes related to physical, cognitive, and emotional health, respectively. Older age (36.6% relative variance explained), grit (23.6%), and optimism (17.5%) explained the majority of the variance in negative age stereotypes related to physical aging; grit (46.6%), openness to experiences (31.5%), and older age (15.1%) in negative age stereotypes related to cognitive aging; and emotional stability (28.8%), purpose in life (28.8%), and grit (25.3%) in negative age stereotypes related to emotional aging. This study provides an up-to-date characterization of the prevalence and correlates of negative aging stereotypes in U.S. veterans. Results underscore the importance of targeting key correlates of negative aging stereotypes, such as lower grit, as part of efforts to promote health and functioning in this population.

Well-Being Domains in U.S. Military Veterans: Identifying Modifiable Factors to Promote Whole Health.

The U.S. Department of Veterans Affairs is actively transitioning away from a disease-centric model of healthcare to one that prioritizes disease prevention and the promotion of overall health and well-being. Described as Whole Health, this initiative aims to provide personalized, values-centered care that optimizes physical, behavioral, spiritual, and socioeconomic well-being. To inform this initiative, we analyzed cross-sectional data from a nationally representative sample of primarily older U.S. military veterans to estimate levels of well-being across these domains, and identify sociodemographic, military, and potentially modifiable health and psychosocial correlates of them. Results revealed that, overall, veterans reported high domain-specific well-being (average scores ranging from 6.7 to 8.3 out of 10), with the highest levels in the socioeconomic domain and lowest in the physical domain. Several modifiable factors, including purpose in life, resilience, and social support, were strongly associated with the examined well-being domains. Interventions targeting these constructs may help promote well-being among U.S. veterans.

Using the Moral Injury and Distress Scale to identify clinically meaningful moral injury.

Despite the proliferation of moral injury studies, a remaining gap is distinguishing moral injury from normative distress following exposure to potentially morally injurious events (PMIEs). Our goal was to leverage mental health and functional measures to identify clinically meaningful and functionally impairing moral injury using the Moral Injury and Distress Scale (MIDS). Participants who endorsed PMIE exposure (N = 645) were drawn from a population-based sample of military veterans, health care workers, and first responders. Using signal detection methods, we identified the optimally efficient MIDS score for detecting clinically significant posttraumatic stress and depressive symptom severity, trauma-related guilt, and functional impairment. The most efficient cut scores across outcomes converged between 24 and 27. We recommend a cut score of 27 given that roughly 70% of participants who screened positive on the MIDS at this threshold reported clinically significant mental health symptoms, and approximately 50% reported severe trauma-related guilt and/or functional impairment. Overall, 10.2% of respondents exposed to a PMIE screened positive for moral injury at this threshold, particularly those who identified as a member of a minoritized racial or ethnic group (17.9%) relative to those who identified as White, non-Hispanic (8.0%), aOR = 2.52, 95% CI [1.45, 4.42]. This is the first known study to establish a cut score indicative of clinically meaningful and impairing moral injury. Such scores may enhance clinicians' abilities to conduct measurement-based moral injury care by enabling them to identify individuals at risk of negative outcomes and better understand risk and protective factors for moral injury.

Adsorption of Nitrogen Dioxide on Nitrogen-Enriched Activated Carbons.

The aim of this study was to obtain nitrogen-enriched activated carbons from orthocoking coal. The initial material was subjected to a demineralisation process. The demineralised precursor was pyrolysed at 500 °C and then activated with sodium hydroxide at 800 °C. Activated carbon adsorbents were subjected to the process of ammoxidation using a mixture of ammonia and air at two different temperature variants (300 and 350 °C). Nitrogen introduction was carried out on stages of demineralised precursor, pyrolysis product, and oxidising activator. The elemental composition, acid-base properties, and textural parameters of the obtained carbon adsorbents were determined. The activated carbons were investigated for their ability to remove nitrogen dioxide. The results demonstrated that the ammoxidation process incorporates new nitrogen-based functional groups into the activated carbon structure. Simultaneously, the ammoxidation process modified the acid-base characteristics of the surface and negatively affected the textural parameters of the resulting adsorbents. Furthermore, the study showed that all of the obtained carbon adsorbents exhibited a distinct microporous texture. Adsorption tests were carried out against NO2 and showed that the carbon adsorbents obtained were highly effective in removing this gaseous pollutant. The best sorption capacity towards NO2 was 23.5 mg/g under dry conditions and 75.0 mg/g under wet conditions.

How Does Radiation Affect Curcumin Raw Material?

Turmeric, known for its curcuminoid-rich rhizome, particularly curcumin, exhibits notable antioxidant and antiviral properties. The likelihood of microbial contamination necessitates finding reliable techniques for subjecting the sample to radiation from this plant-based raw material. One alternative is to expose curcumin to radiation (e-beam), which was carried out as part of this research. Confirmation of the lack of curcumin decomposition was carried out using HPLC-DAD/MS techniques. Additionally, using the EPR technique, the generated free radicals were defined as radiation effects. Using a number of methods to assess the ability to scavenge free radicals (DPPH, ABTS, CUPRAC, and FRAP), a slight decrease in the activity of curcumin raw material was determined. The analysis of the characteristic bands in the FT-IR spectra allowed us to indicate changes in the phenolic OH groups as an effect of the presence of radicals formed.

A Study on the Adsorption of Rhodamine B onto Adsorbents Prepared from Low-Carbon Fossils: Kinetic, Isotherm, and Thermodynamic Analyses.

The aim of this study was to obtain a series of activated carbon samples by the chemical activation of low-rank coal. The precursor was impregnated with a NaOH solution. Activated carbons were characterized by determining their textural parameters and content of surface oxygen functional groups and by using an elemental analysis. The carbons were tested as potential adsorbents for the removal of liquid pollutants represented by rhodamine B. The effectiveness of rhodamine B removal from water solutions depended on the initial concentration of the dye, the mass of rhodamine B, and the pH and temperature of the reaction. The isotherm examination followed the Langmuir isotherm model. The maximum adsorption capacity of the rhodamine B was 119 mg/g. The kinetic investigation favored the pseudo-second-order model, indicating a chemisorption mechanism. The thermodynamic assessment indicated spontaneous and endothermic adsorption, with decreased randomness at the solid-liquid interface. The experiment revealed that a 0.1 M HCl solution was the most effective regenerative agent.

Problematic Alcohol Use Trajectories in U.S. Military Veterans during a Public Health Crisis: Results from a 3-year, Nationally Representative, Longitudinal Study.

A growing number of studies have examined alcohol use during the COVID-19 pandemic. However, few longitudinal studies evaluated the prevalence and correlates of different trajectories of problematic alcohol use in vulnerable segments of the population, such as US veterans, over the 3-year course of the COVID-19 pandemic. Data were analyzed from the National Health and Resilience in Veterans Study, a nationally representative, longitudinal study of 2,441 US veterans. Latent growth mixture modeling was used to identify the trajectories and correlates of problematic alcohol use. Four trajectories were identified: consistent (N = 170, weighted 7.2%), decreasing (N = 38, weighted 2.2%), increasing (N = 22, weighted 1.2%), and low (N = 2,211, weighted 89.4%) problematic alcohol use. Greater household income, pre-pandemic drug use disorder (DUD), lower social support, and COVID-19 infection to self or non-household members were associated with an increasing relative to decreasing problematic alcohol use trajectory. Greater household income, adverse childhood experiences (ACEs), pre-pandemic DUD, lower social support, and greater COVID-related social restriction stress were associated with an increasing relative to a low problematic alcohol use trajectory. Younger age, male sex, ACEs, pre-pandemic DUD, lower pre-pandemic and greater decline in protective psychosocial characteristics, COVID-19 infection to non-household member, and lower COVID-related financial stress were associated with a consistent relative to a low problematic alcohol use trajectory. Overall, pre-pandemic greater income, DUD, and lower social support were associated with an increase in problematic alcohol use among US veterans during the COVID-19 pandemic. Results may help inform prevention efforts to mitigate problematic alcohol use during prolonged crises in this population.

Barriers to Mental Health Care in US Military Veterans.

BACKGROUND: Military veterans often encounter multiple obstacles to mental health care, such as stigma, practical barriers (e.g., high cost), and negative beliefs about mental health care. To date, however, nationally representative data on the prevalence and key correlates of these barriers to care are lacking. Such data are critical to informing population-based efforts to reduce barriers and promote engagement in mental health treatment in this population. METHODS: Data were analyzed from the National Health and Resilience in Veterans Study, which surveyed 4,069 US veterans, 531 (weighted 15.0%) of whom screened positive for a mental disorder but never received mental health treatment. Multivariable logistic regression and relative importance analyses were conducted to identify key predisposing, enabling, and need-based factors associated with endorsement of stigma, instrumental barriers, and negative beliefs about mental health care. RESULTS: A total 47.1% of veterans endorsed any barrier to care, with 38.7% endorsing instrumental barriers to care, 28.8% perceived stigma, and 22.0% negative beliefs about mental health care. Lower purpose in life, grit, and received social support were most consistently associated with these barriers to care. CONCLUSIONS: Nearly half of US veterans with psychiatric need and no history of mental health treatment report barriers to care. Modifiable characteristics such as a low purpose in life, grit, and received support were associated with endorsement of these barriers. Results may help inform resource allocation, as well as prevention, psychoeducation, and treatment efforts to help reduce barriers and promote engagement with mental health services in this population.

Posttraumatic Growth in U.S. Military Veterans: Results from the National Health and Resilience in Veterans Study.

Despite increasing recognition that positive psychological changes or posttraumatic growth (PTG) may develop after highly stressful or traumatic events, contemporary population-based data on the epidemiology of PTG in high-risk samples such as U.S. military veterans are lacking. Additionally, in light of emerging evidence suggesting an 8-factor model of posttraumatic stress disorder (PTSD) symptoms, an up-to-date characterization of how these symptom clusters relate to PTG can help inform efforts to help promote PTG. Data were analyzed from the 2019-2020 National Health and Resilience in Veterans Study (NHRVS), which surveyed a nationally representative sample of 3,847 trauma-exposed U.S. veterans. Participants completed assessments of potentially traumatic events, PTSD symptoms, and PTG, as well as a broad range of sociodemographic, military, trauma, health, personality, and psychosocial characteristics. Results revealed that 63.2% of trauma-exposed veterans and 86.4% of veterans who screened positive for PTSD endorsed moderate-or-greater PTG; these prevalences are higher than those reported in an independent U.S. veteran sample in 2011 (50.1% and 72.0%, respectively). An inverted U-shaped association was observed between PTSD symptom severity and PTG levels, with scores of 31 to 51 on the PTSD Checklist for DSM-5 associated with the highest likelihood of PTG. Intrinsic religiosity and internally- and externally-generated intrusive symptoms of PTSD were identified as the strongest correlates of PTG. Results suggest that prevention and treatment efforts to mitigate severe PTSD symptoms, and help promote intrinsic religiosity, and more deliberate and organized rumination about traumatic experiences may help foster PTG in veterans.

The mediating role of social support in associations between childhood adversity, military sexual trauma, and homelessness in a nationally representative sample of US veterans.

Among veterans, availability of social support and histories of military sexual trauma (MST) and/or adverse childhood experiences (ACEs) are particularly salient correlates of homelessness. Using path analyses, we investigated whether social support (i.e., interpersonal social support and community integration) would at least partially account for the relationships of MST and ACEs with any lifetime homelessness in a large, nationally representative sample of veterans (N = 4069, 9.8% female). Interpersonal social support and community integration partially explained the relationship between ACEs and any lifetime homelessness. However, they did not mediate the relationship between MST and any lifetime homelessness. Female veterans also reported higher trauma rates and lower perceived social support than male counterparts during correlational analyses. These results reinforce existing literature on the importance of research and interventions tailored to veterans with low social support and integration. Results have potential to inform interventions and policy for veterans experiencing and/or at risk for homelessness.

Hippocampal Threat Reactivity Interacts with Physiological Arousal to Predict PTSD Symptoms.

Hippocampal impairments are reliably associated with post-traumatic stress disorder (PTSD); however, little research has characterized how increased threat-sensitivity may interact with arousal responses to alter hippocampal reactivity, and further how these interactions relate to the sequelae of trauma-related symptoms. In a sample of individuals recently exposed to trauma (N=116, 76 Female), we found that PTSD symptoms at 2-weeks were associated with decreased hippocampal responses to threat as assessed with functional magnetic resonance imaging (fMRI). Further, the relationship between hippocampal threat sensitivity and PTSD symptomology only emerged in individuals who showed transient, high threat-related arousal, as assayed by an independently collected measure of Fear Potentiated Startle. Collectively, our finding suggests that development of PTSD is associated with threat-related decreases in hippocampal function, due to increases in fear-potentiated arousal.Significance StatementAlterations in hippocampal function linked to threat-related arousal are reliably associated with post-traumatic stress disorder (PTSD); however, how these alterations relate to the sequelae of trauma-related symptoms is unknown. Prior models based on non-trauma samples suggest that arousal may impact hippocampal neurophysiology leading to maladaptive behavior. Here we show that decreased hippocampal threat sensitivity interacts with fear-potentiated startle to predict PTSD symptoms. Specifically, individuals with high fear-potentiated startle and low, transient hippocampal threat sensitivity showed the greatest PTSD symptomology. These findings bridge literatures of threat-related arousal and hippocampal function to better understand PTSD risk.