The internalizing and externalizing structure of psychiatric comorbidity in combat veterans

Trauma exposure and transdiagnostic distress: Examining shared and posttraumatic stress disorder-specific associations

We examined transdiagnostic and posttraumatic stress disorder (PTSD)-specific associations with multiple forms of trauma exposure within a nationwide U.S. sample (N = 1,649, 50.0% female) of military veterans overselected for PTSD. A higher-order Distress factor was estimated using PTSD, major depressive disorder (MDD), and generalized anxiety disorder (GAD) symptoms as indicators. A structural equation model spanning three assessment points over an average of 3.85 years was constructed to examine the unique roles of higher-order Distress and PTSD-specific variance in accounting for the associations between trauma exposure, measured using the Life Events Checklist (LEC) and Deployment Risk and Resiliency Inventory Combat subscale (DRRI-C), and psychosocial impairment. The results suggest the association between trauma exposure and PTSD symptoms was primarily mediated by higher-order distress (70.7% of LEC effect, 63.2% of DRRI-C effect), but PTSD severity retained a significant association with trauma exposure independent of distress, LEC: β = .10, 95% CI [.06, .13]; DRRI-C: β = .11, 95% CI [.07, .14]. Both higher-order distress, β = .31, and PTSD-specific variance, β = .36, were necessary to account for the association between trauma exposure and future impairment. Findings suggest that trauma exposure may contribute to comorbidity across a range of internalizing symptoms as well as to PTSD-specific presentations.

Meta-analysis of structural evidence for the Hierarchical Taxonomy of Psychopathology (HiTOP) model

BACKGROUND

The Hierarchical Taxonomy of Psychopathology (HiTOP) is a classification system that seeks to organize psychopathology using quantitative evidence - yet the current model was established by narrative review. This meta-analysis provides a quantitative synthesis of literature on transdiagnostic dimensions of psychopathology to evaluate the validity of the HiTOP framework.

METHODS

Published studies estimating factor-analytic models from diagnostic and statistical manual of mental disorders (DSM) diagnoses were screened. A total of 120,596 participants from 35 studies assessing 23 DSM diagnoses were included in the meta-analytic models. Data were pooled into a meta-analytic correlation matrix using a random effects model. Exploratory factor analyses were conducted using the pooled correlation matrix. A hierarchical structure was estimated by extracting one to five factors representing levels of the HiTOP framework, then calculating congruence coefficients between factors at sequential levels.

RESULTS

Five transdiagnostic dimensions fit the DSM diagnoses well (comparative fit index = 0.92, root mean square error of approximation = 0.07, and standardized root-mean-square residual = 0.03). Most diagnoses had factor loadings >|0.30| on the expected factors, and congruence coefficients between factors indicated a hierarchical structure consistent with the HiTOP framework.

CONCLUSIONS

A model closely resembling the HiTOP framework fit the data well and placement of DSM diagnoses within transdiagnostic dimensions were largely confirmed, supporting it as valid structure for conceptualizing and organizing psychopathology. Results also suggest transdiagnostic research should (1) use traits, narrow symptoms, and dimensional measures of psychopathology instead of DSM diagnoses, (2) assess a broader array of constructs, and (3) increase focus on understudied pathologies.

Alcohol Addiction in War Veterans Treated in a In-patient Psychiatric Facility: Incidence, Comorbidity with PTSD Symptoms, Association with Combat Stressors

BACKGROUND

The dearth of and inconsistency in the data on the prevalence, risks of occurrence, comorbidity, and causation of stress-related disorders and alcohol use disorders in Russian veterans of local wars constituted the background for this study.

AIM

To study the psychopathological structure, clinical changes, and the reasons for the mental disorders suffered by Russian veterans of local wars; in particular, to study the prevalence, pathogenic factors, comorbidity of alcohol addiction and alcohol abuse, together with symptoms of stress disorders, in Russian veterans undergoing inpatient treatment.

METHODS

Our observational case-control study included 685 patients who were undergoing treatment in the psychiatric department of a military hospital: the Main group (veterans) consisted of 264 veterans of armed conflicts who had undergone inpatient treatment from 1992 to 2010; the Control group, 1, 296 patients, all servicemen and military pensioners who had undergone inpatient treatment during a calendar year and had never taken part in combat operations in the past; Control group 2, 125 military personnel (regular and reserve) who had not taken part in combat operations and corresponded to the patients of the main group in terms of the mean age and age distribution curve. We performed a clinical and psychopathological analysis of the symptoms identified in patients from the compared samples and, then, compared them with the ICD-10 criteria of post-traumatic stress disorder (PTSD) and alcohol-related disorders. This allowed us to establish the significance of the difference in their frequency and degree of association at the stage of the data analysis.

RESULTS

We uncovered no difference in the prevalence of symptoms of alcohol addiction and alcohol abuse among veterans and other servicemen and military pensioners who had not taken part in combat operations. However, there was a tendency to underdiagnose alcohol addiction in veterans in general and those with symptoms of PTSD, in particular. That is, alcohol addiction was not diagnosed in most cases when the veterans displayed symptoms of stress or other mental disorders, in addition to the signs of alcohol addiction. In most such cases, a stress-related mental disorder or another mental disorder with identified signs was diagnosed and alcohol abuse was described as a concomitant disorder or a complication. There was no significant association between any form of alcohol addiction or abuse and the presence of stress disorder symptoms in our sample of veterans; on the contrary, symptoms of re-experience of trauma were more often observed in veterans who were not prone to frequent drinking. The incidence of combat stressors traced in the medical history did not differ in veterans with any form of alcohol abuse and veterans who were not prone to frequent drinking. However, the main group subjects with alcohol addiction more often displayed cases of addictive behavior during combat operations. Therefore, alcohol abuse during combat operations requires additional research to better establish its prognostic significance.

CONCLUSION

This Study found no difference in the incidence of alcohol dependence and alcohol abuse among veterans and other officers. In the sample of veterans, there was no significant association between alcoholism and the presence of PTSD symptoms or a history of combat stressors. It is possible that the same risk of alcohol addiction in different categories of military officers is due to a compact of social stressors that equally had a more significant adverse effect on the entire population of Russian military personnel in the 90s of the last century and the first years of this century, as well as the massive abuse of alcohol, which could also equalize the risks of developing alcohol dependence in all groups of militaries.

For whom the bell tolls: psychopathological and neurobiological correlates of a DNA methylation index of time-to-death

Psychopathology is a risk factor for accelerated biological aging and early mortality. We examined associations between broad underlying dimensions of psychopathology (reflecting internalizing and externalizing psychiatric symptoms), PTSD, and age-adjusted GrimAge ("GrimAge residuals"), a DNA methylation biomarker of mortality risk relative to age. We also examined neurobiological correlates of GrimAge residuals, including neurocognitive functioning, blood-based biomarkers (of inflammation, neuropathology, metabolic disease), and cortical thickness. Data from two independent trauma-exposed military cohorts (n = 647 [62.9% male, Mage = 52], n = 434 [90% male, Mage = 32]) were evaluated using linear regression models to test associations between GrimAge residuals, psychopathology, and health correlates. Externalizing psychopathology significantly predicted GrimAge residuals in both cohorts (ps < 0.028). PTSD predicted GrimAge residuals in the younger (p = 0.001) but not the older cohort. GrimAge residuals were associated with several neurobiological variables available in the younger cohort, including cognitive disinhibition (padj = 0.021), poorer memory recall (padj = 0.023), cardiometabolic pathology (padj < 0.001), oxidative stress (padj = 0.003), astrocyte damage (padj = 0.021), inflammation (C-reactive protein: padj < 0.001; IL-6: padj < 0.001), and immune functioning (padj < 0.001). A subset of inflammatory and neuropathology analytes were available in the older cohort and showed associations with GrimAge residuals (IL-6: padj < 0.001; TNF-α: padj < 0.001). GrimAge residuals were also associated with reduced cortical thickness in right lateral orbitofrontal cortex (padj = 0.018) and left fusiform gyrus (padj = 0.030), which are related to emotion regulation and facial recognition, respectively. Psychopathology may be a common risk factor for elevated mortality risk. GrimAge could help identify those at risk for adverse health outcomes and allow for early disease identification and treatment.

The Influence of Service Era: Comparing Personality Assessment Inventory (PAI) Scale Scores Within a Posttraumatic Stress Disorder Treatment Clinic (PCT)

Research is mixed on the role of service era in symptom endorsement among Veterans, with differences emerging depending on the instrument evaluated. This study compares Personality Assessment Inventory (PAI) scale scores of VA test-takers who served during the Vietnam, Desert Storm, or Post-9/11 service eras. The sample was collected at a VA Posttraumatic Stress Disorder Clinical Team. Associations between gender and combat exposure were also examined as covariates. Results suggest that Veterans' self-report on the PAI is influenced by service era, even after accounting for gender and combat exposure during deployment. The largest differences were between Vietnam or Post-9/11 Veterans and those from the Gulf War era. Symptom differences typically varied across scales commonly associated with symptoms of trauma exposure/posttraumatic stress disorder. Implications for the clinical use of, and research with, the PAI and other broadband personality assessments within the VA healthcare system and trauma treatment settings are discussed.

Conceptualizing traumatic stress and the structure of posttraumatic psychopathology through the lenses of RDoC and HiTOP

Trauma-related psychopathology, most notably posttraumatic stress disorder (PTSD), poses unique challenges for psychiatric nosology due to the wide range of symptoms and diagnoses associated with trauma and challenges representing the impact of trauma exposure on psychopathology. In this paper, we review the literature on categorical (i.e., Diagnostic and Statistical Manual of Mental Disorders and International Classification of Diseases systems) versus dimensional conceptualizations of trauma-related symptoms with an emphasis on the Research Domain Criteria (RDoC) and the Hierarchical Taxonomy of Psychopathology (HiTOP) frameworks. We identify strengths of each approach and challenges in accommodating the full range of trauma-related psychopathology and the clinical implications thereof. We discuss several potential approaches for improving the representation of traumatic stress, including the use of PTSD subtypes, trauma-related specifiers for psychiatric diagnoses, and the development of a dimension that we call the traumatic stress spectrum, which spans both adaptive and adverse reactions to trauma. These approaches to representing traumatic stress can be evaluated empirically and further refined. We also discuss how the use of an integrated RDoC-HiTOP approach to reconceptualize traumatic stress might maximize the ability to model valid and reliable trauma-related phenotypes, which would aid in the investigation of clinically relevant biological correlates.

Using Danish national registry data to understand psychopathology following potentially traumatic experiences

Research on posttraumatic psychopathology has focused primarily on posttraumatic stress disorder (PTSD); other posttraumatic psychiatric diagnoses are less well documented. The present study aimed to (a) develop a methodology to derive a cohort of individuals who experienced potentially traumatic events (PTEs) from registry-based data and (b) examine the risk of psychopathology within 5 years of experiencing a PTE. Using data from Danish national registries, we created a cohort of individuals with no age restrictions (range: 0-108 years) who experienced at least one of eight possible PTEs between 1994 and 2016 (N = 1,406,637). We calculated the 5-year incidence of nine categories of ICD-10 psychiatric disorders among this cohort and examined standardized morbidity ratios (SMRs) comparing the incidence of psychopathology in this group to the incidence in a nontraumatic stressor cohort (i.e., nonsuicide death of a relative; n = 423,270). Stress disorders (2.5%), substance use disorders (4.1%), and depressive disorders (3.0%) were the most common diagnoses following PTEs. Overall, the SMRs for the associations between any PTE and psychopathology varied from 1.9, 95% CI [1.9, 2.0], for stress disorders to 5.2, 95% CI [5.1. 5.3], for personality disorders. All PTEs except pregnancy-related trauma were associated with all forms of psychopathology. Associations were consistent regardless of whether a stress disorder was present. Traumatic experiences have a broad impact on psychiatric health. The present findings demonstrate one approach to capturing trauma exposure in medical record registry data. Increased traumatic experience characterization across studies will help improve the field's understanding of posttraumatic psychopathology.

Validity and utility of Hierarchical Taxonomy of Psychopathology (HiTOP): III. Emotional dysfunction superspectrum

The Hierarchical Taxonomy of Psychopathology (HiTOP) is a quantitative nosological system that addresses shortcomings of traditional mental disorder diagnoses, including arbitrary boundaries between psychopathology and normality, frequent disorder co-occurrence, substantial heterogeneity within disorders, and diagnostic unreliability over time and across clinicians. This paper reviews evidence on the validity and utility of the internalizing and somatoform spectra of HiTOP, which together provide support for an emotional dysfunction superspectrum. These spectra are composed of homogeneous symptom and maladaptive trait dimensions currently subsumed within multiple diagnostic classes, including depressive, anxiety, trauma-related, eating, bipolar, and somatic symptom disorders, as well as sexual dysfunction and aspects of personality disorders. Dimensions falling within the emotional dysfunction superspectrum are broadly linked to individual differences in negative affect/neuroticism. Extensive evidence establishes that dimensions falling within the superspectrum share genetic diatheses, environmental risk factors, cognitive and affective difficulties, neural substrates and biomarkers, childhood temperamental antecedents, and treatment response. The structure of these validators mirrors the quantitative structure of the superspectrum, with some correlates more specific to internalizing or somatoform conditions, and others common to both, thereby underlining the hierarchical structure of the domain. Compared to traditional diagnoses, the internalizing and somatoform spectra demonstrated substantially improved utility: greater reliability, larger explanatory and predictive power, and greater clinical applicability. Validated measures are currently available to implement the HiTOP system in practice, which can make diagnostic classification more useful, both in research and in the clinic.

Co-occurrence subgroups of child sexual abuse, health risk behaviors and their associations among secondary school students in China

BACKGROUND

Little is known on the co-occurrence and heterogeneity of child sexual abuse (CSA) or health risk behavior (HRB) prevalence nor the associations among the victims.

OBJECTIVES

To detect the prevalence and subgroups of adolescents reporting CSAs or HRBs, and to examine the association between the subgroups.

METHODS

Participants were secondary school students in a national survey in China (N = 8746). Self-reported CSA and HRB experiences were collected through a computer assisted questionnaire. Prevalence and confidence intervals were calculated. Multigroup latent class analysis (LCA) was used to examine latent subgroups of CSA and HRB. Dual latent class regression analysis was used to examine the association between CSA and HRB classes.

RESULTS

A total of 8746 students participated in our study. The prevalence of having ever experienced any of the reported seven CSA items was 12.9%. The preferred LCA model consisted of a three-class CSA latent variable, i.e. "Low CSAs"(95.7% of the total respondents), "Verbal or exhibitionism CSAs"(3.3%), and "high multiple CSAs" (1.1%); and a three-class HRB latent variable, i.e. "Low HRBs"(70.5%), "externalizing HRBs" (20.7%), and "internalizing HRBs" (8.7%). Students in the "Verbal or exhibitionism CSAs" or "high multiple CSAs" classes had higher probabilities of being in "externalizing HRBs" or "internalizing HRBs" classes. The probabilities were higher in "high multiple CSAs" class(male externalizing OR 4.05, 95%CI 1.71-9.57; internalizing OR 11.77, 95%CI 4.76-29.13; female externalizing OR 4.97, 95%CI 1.99-12.44; internalizing OR 9.87, 95%CI 3.71-26.25) than those in "Verbal or exhibitionism CSA"(male externalizing OR 2.51, 95%CI 1.50-4.20; internalizing OR 3.08, 95%CI 1.48-6.40; female externalizing OR 2.53, 95%CI 1.63-3.95; internalizing OR 6.05, 95%CI 3.73-9.80).

CONCLUSIONS

Prevalence of CSA items varies. Non-contact CSAs are the most common forms of child sexual abuse among Chinese school students. There are different latent class co-occurrence patterns of CSA items or HRB items among the respondents. CSA experiences are in association with HRB experiences and the associations between latent classes are dose-responded. Multi-victimization has more significantly negative effects. The results could help identify high-risk subgroups and promote more nuanced interventions addressing adverse experiences and risk behaviors among at-risk adolescents.

Validity and utility of Hierarchical Taxonomy of Psychopathology (HiTOP): II. Externalizing superspectrum

The Hierarchical Taxonomy of Psychopathology (HiTOP) is an empirical effort to address limitations of traditional mental disorder diagnoses. These include arbitrary boundaries between disorder and normality, disorder co-occurrence in the modal case, heterogeneity of presentation within dis-orders, and instability of diagnosis within patients. This paper reviews the evidence on the validity and utility of the disinhibited externalizing and antagonistic externalizing spectra of HiTOP, which together constitute a broad externalizing superspectrum. These spectra are composed of elements subsumed within a variety of mental disorders described in recent DSM nosologies, including most notably substance use disorders and "Cluster B" personality disorders. The externalizing superspectrum ranges from normative levels of impulse control and self-assertion, to maladaptive disinhibition and antagonism, to extensive polysubstance involvement and personality psychopathology. A rich literature supports the validity of the externalizing superspectrum, and the disinhibited and antagonistic spectra. This evidence encompasses common genetic influences, environmental risk factors, childhood antecedents, cognitive abnormalities, neural alterations, and treatment response. The structure of these validators mirrors the structure of the phenotypic externalizing superspectrum, with some correlates more specific to disinhibited or antagonistic spectra, and others relevant to the entire externalizing superspectrum, underlining the hierarchical structure of the domain. Compared with traditional diagnostic categories, the externalizing superspectrum conceptualization shows improved utility, reliability, explanatory capacity, and clinical applicability. The externalizing superspectrum is one aspect of the general approach to psychopathology offered by HiTOP and can make diagnostic classification more useful in both research and the clinic.

The patterns of family genetic risk scores for eleven major psychiatric and substance use disorders in a Swedish national sample

To clarify the structure of genetic risks for 11 major psychiatric disorders, we calculated, from morbidity risks for disorders in 1st-5th degree relatives controlling for cohabitation effects, in the Swedish population born between 1932 and 1995 (n = 5,830,014), the family genetic risk scores (FGRS) for major depression (MD), anxiety disorders (AD), obsessive-compulsive disorder (OCD), bipolar disorder (BD), schizophrenia (SZ), bulimia (BUL), anorexia nervosa (AN), alcohol use disorder (AUD), drug use disorder (DUD), ADHD, and autism-spectrum disorder (ASD). For all affected individuals, we calculated their mean standardized FGRS for each disorder. The patterns of FGRS were quite similar for MD and AD, and for AUD and DUD, but substantially less similar for BUL and AN, BD and SZ, and ADHD and ASD. While OCD had high levels of FGRS for MD and AD, the overall FGRS profile differed considerably from MD and AD. ADHD FGRS scores were substantially elevated in AUD and DUD. FGRS scores for BD, OCD, AN, ASD, ADHD, and especially SZ were relatively disorder-specific while genetic risk for MD and AD had more generalized effects. The levels of FGRS for BMI, coronary artery disease, and educational attainment across our disorders replicated prior associations found using molecular genetic methods. All diagnostic categories examined had elevated FGRS for many disorders producing, for each condition, an informative FGRS profile. Using a novel method which approximates, from pedigree data, aggregate genetic risk, we have replicated and extended prior insights into the structure of genetic risk factors for key psychiatric illnesses.

Co-occurrence Pattern of Posttraumatic Stress Disorder and Depression in People Living With HIV: A Latent Profile Analysis

Background: The comorbidity of posttraumatic stress disorder (PTSD) and depression is common among people living with the HIV (PLWH). Given the high prevalence and serious clinical consequences of the comorbidity of these two disorders, we conducted a latent profile analysis to examine the co-occurrence pattern of PTSD and depression in PLWH.

Methods: The data for this cross-sectional study of PLWH were collected from 602 patients with HIV in China. A secondary analysis using latent profile analysis was conducted to examine HIV-related PTSD and depression symptoms.

Results: A four-class solution fits the data best, with the four classes characterized as asymptomatic (42.9%), mild symptoms (33.9%), low to moderate symptoms (19.8%), and high to moderate symptoms (3.4%). The severity of PTSD and depression symptoms was comparable in this solution, and no group was dominated by PTSD or depression.

Conclusion: The absence of a distinct subcluster of PLWH with only PTSD or depression symptoms supports that PTSD and depression in PLWH are psychopathological manifestations after traumatic exposures. Health care staff should pay more attention to the existence of comorbid symptoms of individuals, develop integrated interventions for the symptoms cluster, and evaluate their effectiveness in clinical practice.

Differences between ICD-11 PTSD and complex PTSD on DSM-5 section III personality traits

Background: The formulations of post-traumatic stress disorder (PTSD) and the newly included disorder complex PTSD (CPTSD) in the 11th edition of the International Classification of Diseases (ICD-11) have not been evaluated on a broad range of maladaptive personality traits. Objective: The aim of this study was to evaluate ICD-11 PTSD and CPTSD on maladaptive personality traits. Method: In a cross-sectional study of 106 Danish outpatients with ICD-10 PTSD, we used the International Trauma Questionnaire (ITQ) to identify patients with either ICD-11 PTSD or CPTSD (N = 84). We utilized the Personality Inventory for DSM-5 (PID-5) from the alternative model of personality disorders in DSM-5, section III, to evaluate personality trait differences between ICD-11 PTSD and CPTSD. Furthermore, PID-5 was also used to investigate relationships between personality traits and ICD-11 PTSD/CPTSD symptom clusters. The Life Event Checklist was used to assess traumatic experiences, and the MINI International Neuropsychiatric Interview was applied to assess comorbidity. Results: Patients with ICD-11 PTSD or CPTSD had elevated scores on personality traits indicative of internalizing psychopathology. However, higher impairment levels of the trait domains Negative Affectivity (d= 0.75) and Psychoticism (d = 0.80) discriminated patients with ICD-11 CPTSD from patients with PTSD. The PID-5 trait domain Detachment was moderately positively correlated to most of the ITQ symptom clusters and, the ITQ Negative Self-concept symptom cluster showed a relatively high number of significant correlations across all the PID-5 trait domains and facets. The PID-5 domain Negative Affectivity and almost all the encompassing facets were significantly correlated with DSO symptom clusters. Conclusions: The findings demonstrate the relevance of applying dimensional assessment of personality features to study the psychopathology of ICD-11 PTSD and CPTSD and potential differences. The results suggest that CPTSD is a more debilitating disorder than PTSD considering the severity of the personality features.

Variable-length Cognitive Processing Therapy for posttraumatic stress disorder in active duty military: Outcomes and predictors

Cognitive Processing Therapy (CPT) is an evidence-based therapy recommended for posttraumatic stress disorder (PTSD). However, rates of improvement and remission are lower in veterans and active duty military compared to civilians. Although CPT was developed as a 12-session therapy, varying the number of sessions based on patient response has improved outcomes in a civilian study. This paper describes outcomes of a clinical trial of variable-length CPT among an active duty sample. Aims were to determine if service members would benefit from varying the dose of treatment and identify predictors of treatment length needed to reach good end-state (PTSD Checklist-5 ≤ 19). This was a within-subjects trial in which all participants received CPT (N = 127). Predictor variables included demographic, symptom, and trauma-related variables; internalizing/externalizing personality traits; and readiness for change. Varying treatment length resulted in more patients achieving good end-state. Best predictors of nonresponse or needing longer treatment were pretreatment depression and PTSD severity, internalizing temperament, being in precontemplation stage of readiness for change, and African American race. Controlling for differences in demographics and initial PTSD symptom severity, the outcomes using a variable-length CPT protocol were superior to the outcomes of a prior study using a fixed, 12-session CPT protocol. CLINICALTRIALS.GOV IDENTIFIER: NCT023818.

DSM-5 Level 1 cross-cutting measure in an online sample: evaluating its latent dimensionality and utility detecting nonspecific psychological distress

Included in the most recent Diagnostic and Statistical Manual of Mental Disorders is the Level 1 Cross-Cutting Symptom Measure (CCSM), a self-report checklist with 23 items assessing 13 major psychiatric symptom clusters. To date, minimal literature has examined the factor structure of the CCSM and its utility identifying significant psychological distress, and existing studies pose notable limitations. Four hundred (400) American adults (M age = 34.13; 50.2% female) participated online via Amazon Mechanical Turk as part of a larger study, which included the CCSM. The sample was randomly split to conduct exploratory and confirmatory factor analyses (EFAs and CFAs). EFAs revealed structures with one (general psychopathology) and two (externalizing/serious mental illness and internalizing/affective) factors accounting for 67.3% and 73.7% of the variance, respectively. CFAs indicated good fit for both models, though statistical comparison of the models via χ² difference test revealed the two-factor model provided significantly better fit. Areas under the receiver operating curve (AUCs) suggested that all CCSM variables of interest poorly differentiated those currently receiving mental health treatment from those who have never received mental health treatment (AUCs ranged from .57 to .68). Implications of these findings, various limitations, and recommendations for future lines of inquiry were discussed.

Post-traumatic symptom severity mediates the association between combat exposure and suicidal ideation in veterans

OBJECTIVE

Previous studies of military veterans have produced mixed findings regarding whether combat exposure is directly related to suicidal ideation or is indirectly related to suicidal ideation via its influence on other factors. The present study used a longitudinal design to test the hypothesis that post-traumatic stress disorder (PTSD) symptom severity mediates the effect of combat exposure on suicidal ideation in veterans.

METHOD

Participants included 319 post-9/11 veterans (83.4% male; 42.1% White/52.1% Black; Mage  = 39.7) assessed at baseline, 6, and 12 months. Structural equation modeling and bootstrapped confidence intervals were employed to examine the direct and indirect relationships between combat exposure, suicidal ideation, and PTSD symptom severity.

RESULTS

Results from the mediation model, in which demographic variables and non-combat trauma were included as covariates, revealed that the indirect effect of combat exposure on suicidal ideation via PTSD symptom severity was statistically significant, accounting for 64.1% of the covariance between combat exposure and suicidal ideation.

CONCLUSIONS

This study provides longitudinal evidence that the effects of combat exposure on suicidal ideation are mediated by PTSD symptom severity, suggesting the importance of targeting such symptoms in treatment to mitigate suicide risk among veterans with combat exposure.

The overlap between OCD and PTSD: Examining self-reported symptom differentiation

The role of stressful precipitating events has long been recognized in the genesis of obsessive-compulsive disorder (OCD). Posttraumatic stress disorder (PTSD) also necessitates the experience of a traumatic event (PTSD criterion A). Research has demonstrated a high degree of comorbidity between these two conditions. However, few studies have examined symptom overlap as a potential cause for this co-occurrence. Thus, the purpose of the present study was to examine symptom endorsement and overlap between OCD and PTSD using a sample of trauma exposed veterans. Veterans were administered self-report assessments, including the Dimensional Obsessive-Compulsive Scale (DOCS) and the PTSD Checklist for DSM-5 (PCL-5), as part of a routine clinical care at a Veteran's Administration hospital. Based on self-report assessment of clinical cut scores, 81% of participants met for probable PTSD and 74% for probable OCD. In addition, a series of chi square analyses revealed frequent overlap of endorsement across items with similar content. There is significant overlap between PTSD and OCD symptoms, and patients may find it difficult to differentiate between them on self-report measures. As such, caution should be used when using self-report solely to assess PTSD and OCD, particularly in traumatized samples.

Testing a variable-length Cognitive Processing Therapy intervention for posttraumatic stress disorder in active duty military: Design and methodology of a clinical trial

Combat-related trauma exposures have been associated with increased risk for posttraumatic stress disorder (PTSD) and comorbid mental health conditions. Cognitive Processing Therapy (CPT) is a 12-session manualized cognitive-behavioral therapy that has emerged as one of the leading evidence-based treatments for combat-related PTSD among military personnel and veterans. However, rates of remission have been less in both veterans and active duty military personnel compared to civilians, suggesting that studies are needed to identify strategies to improve upon outcomes in veterans of military combat. There is existing evidence that varying the number of sessions in the CPT protocol based on patient response to treatment improves outcomes in civilians. This paper describes the rationale, design, and methodology of a clinical trial examining a variable-length CPT intervention in a treatment-seeking active duty sample with PTSD to determine if some service members would benefit from a longer or shorter dose of treatment, and to identify predictors of length of treatment response to reach good end-state functioning. In addition to individual demographic and trauma-related variables, the trial is designed to evaluate factors related to internalizing/externalizing personality traits, neuropsychological measures of cognitive functioning, and biological markers as predictors of treatment response. This study attempts to develop a personalized approach to achieving positive treatment outcomes for service members suffering from PTSD. Determining predictors of treatment response can help to develop an adaptable treatment regimen that returns the greatest number of service members to full functioning in the shortest amount of time.

Dealing with complexity and comorbidity: Opportunity for transdiagnostic treatment for PTSD

Purpose of Review

This review synthesizes literature on transdiagnostic treatments for PTSD and trauma-related psychopathology over the last three years and discusses their across diverse contexts.

Recent Findings

Global and domestic studies suggest that a transdiagnostic approach has the potential to address many challenges providers encounter when treating traumatized populations. Existing research shows that transdiagnostic approaches (including the Unified Protocol, Common Elements Treatment Approach, and Modular Approach to Therapy for Children) are effective across low and high resourced settings, populations, and with comorbid mental health symptoms. Moreover, transdiagnostic approaches offer flexibility in treatment delivery, adaptability across contexts, and parsimonious training to treatment providers. They also provide a standalone alternative for unable or unwilling individuals to engage in traditional single diagnosis trauma-focused treatment, or those presenting with complex presentations that might otherwise require sequential courses of targeted interventions.

Summary

The promise of transdiagnostic treatment for trauma-populations is strong. Research is needed to examine patient and therapist perceptions of these approaches for optimally addressing PTSD and related symptoms, the extent to which they offer comparable, or perhaps better, outcomes than existing single diagnosis PTSD treatments, and their sustainability overtime. Considerations of adaptations to transdiagnostic treatment manuals across settings are also needed.

PTSD symptoms are differentially associated with general distress and physiological arousal: Implications for the conceptualization and measurement of PTSD

BACKGROUND

The primary purpose of this study was to examine the place of posttraumatic stress disorder (PTSD) vis-à-vis the external dimensions of general distress and physiological arousal.

METHODS

Using data collected from veterans of the wars in Iraq and Afghanistan (N = 1350), latent variable covariance structure modeling was employed to compare correlations of PTSD symptom clusters and individual PTSD symptoms with general distress and physiological arousal.

RESULTS

Each PTSD symptom cluster, and 17 of 20 individual PTSD symptoms were more strongly associated with general distress than with physiological arousal. However, moderate to strong associations were also found between physiological arousal and both PTSD clusters and symptoms.

LIMITATIONS

Findings are based on self-reported data elicited from a single sample of veterans with substantial PTSD symptoms. Replication, particularly by clinician interview, is necessary. Generalizability to other traumatized populations is unknown.

CONCLUSIONS

Results offer support, with caveats, for viewing PTSD as a distress disorder. Findings are not consistent with the position that PTSD is a hybrid disorder with some features reflecting hyperarousal and others indicative of general distress. Results have implications for the conceptualization and measurement of PTSD.

Obsessive-Compulsive Tendencies in a Sample of Veterans With Posttraumatic Stress Disorder

Obsessive-compulsive disorder (OCD) is considered one of the most debilitating disorders worldwide. Data suggests that trauma may be a significant source of not only posttraumatic stress disorder (PTSD), but also OCD. An epidemiologic study of the general population found the risk for OCD to be increased 10-fold in persons with PTSD. The National Vietnam Veterans Readjustment Study found the prevalence of OCD to be 5.2% in war-zone veterans and other studies highlighted PTSD-OCD comorbidity rates ranging from 41% to 70%. However, the frequency of diagnosed OCD is low among veterans (0.6%), and veterans with OCD receive little mental healthcare after diagnosis (mean: 3.8 sessions). The present study examined obsessive-compulsive (OC) tendencies in a sample of veterans with PTSD seeking treatment in a Veterans Affairs (VA) PTSD program between 2011 and 2013. Of the 318 veterans with PTSD included in the current study, 125 (36%) also reported OC tendencies. Data analyses revealed that participants with PTSD who showed evidence of OC tendencies demonstrated more severe PTSD symptoms, higher anxiety sensitivity, and lower cognitive flexibility than participants with PTSD without comorbid OC tendencies; no differences regarding posttraumatic growth were found between the two groups. This is a preliminary study aiming to assess OC tendencies in a sample of veterans with PTSD and expand on the limited existing literature on OCD-PTSD comorbid presentation among veterans.

Obsessive-Compulsive Symptom Dimensions and Insomnia: Associations Among a Treatment-Seeking Veteran Sample

Sleep disturbances are a prevalent and pernicious correlate of most emotional disorders. A growing body of literature has recently found evidence for an association between sleep disturbances and obsessive-compulsive disorder (OCD). Though informative, this link has yet to be explored in a veteran population. Further, the degree to which this relationship is accounted for by relevant third variables is limited. The current study investigated the relationship between self-reported insomnia and OCD symptoms after controlling for probable depression and posttraumatic stress disorder (PTSD) using an unselected sample of veterans (N = 57). Most of the sample reported clinically significant OCD (61%) and insomnia symptoms (58%). Results revealed associations between insomnia and OCD unacceptable thoughts/neutralizing compulsions, but not contamination obsessions/washing compulsions, responsibility for harm obsessions/checking compulsions, or symmetry obsessions/ordering compulsions. Findings highlight the need for more research on OCD and sleep problems and clinical work focused on sleep for patients reporting increased OCD symptoms, particularly veterans.

Prevalence and Treatment of Obsessive-Compulsive Disorder in Veterans and Active-Duty Service Members: A Systematic Review

The prevalence and treatment of obsessive-compulsive disorder (OCD) in veterans and active-duty military remains unclear. We systematically reviewed literature on OCD diagnosis and treatment in U.S. Veterans and active-duty military to obtain a prevalence estimate, describe treatment approaches for OCD in veterans, and evaluate use of Exposure and Response Prevention (ERP). Eight terms were used to identify studies in PubMed, PsychINFO and SCOPUS up to March 13, 2018; additional articles were identified from reference lists of 19 included studies, 16 addressing prevalence, and 3 addressing treatment. OCD prevalence is lower in studies employing electronic medical records databases than in studies using OCD assessments, suggesting underrecognition of OCD in clinical settings. Higher prevalence was seen with OCD screening tools than with diagnostic interviews. Lower OCD prevalence was seen in active-duty individuals than in veterans. Two case studies showed a decrease in OCD symptoms following ERP. Additional studies with larger samples and controlled designs examining ERP are needed.

Examining the Relationships Between Perfectionism and Obsessive-Compulsive Symptom Dimensions Among Rural Veterans

Perfectionism, a trait-like individual difference variable reflecting the tendency to set extremely high standards along with critical evaluations of one's own behavior, has long been regarded as a risk and maintenance factor for obsessive-compulsive disorder (OCD). However, research exploring the relationship between these constructs is mixed. One explanation for these equivocal findings is the heterogeneous nature of OCD. Indeed, there is increasing evidence for distinct symptom dimensions that are more homogenous than the broad OCD phenotype. The current study examined the associations between self-reported perfectionism and OCD symptom dimensions controlling for probable depression status. The sample included 67 rural veterans. Results revealed a unique association between perfectionism and the unacceptable thoughts dimension of OCD. These findings are consistent with a growing body of literature demonstrating that OCD symptom dimensions have unique underlying dysfunctional beliefs.

Psychological Inflexibility Predicts of Suicidal Ideation Over Time in Veterans of the Conflicts in Iraq and Afghanistan

Psychological inflexibility, or how individuals respond to distressing internal experiences, may be a modifiable risk factor for suicide in veterans. It was hypothesized that psychological inflexibility would predict suicidal ideation after accounting for established risk factors at baseline and 1 year later. Post-9/11 veterans (N = 309) completed clinical interview and self-report measures at baseline and 1-year follow-up. Results indicated that psychological inflexibility predicted severity of suicidal ideation at both baseline and 1 year later, after accounting for established risk factors. Psychological inflexibility is an important marker of risk for suicidal ideation, and could be a target for interventions aimed at reducing suicide.

Of Fallacies and Errors, New and Repeated: A Rejoinder to Butcher et al. (2018)

Butcher, Hass, Greene, Nelson, Nichols, and Williams ( 2018 ) responded to my (Ben-Porath, 2018 ) critique of Butcher, Hass, Greene, and Nelson's (2015) analysis of Ted Kaczynski's MMPI-2-RF, purporting to find logical fallacies in my arguments and shortcomings in my interpretation of MMPI-2-RF scales. Butcher et al. ( 2018 ) repeated several previously refuted arguments and opinions, while failing to acknowledge, let alone consider, prior responses to their claims. In this rejoinder I refute (again) Butcher et al.'s assertion that empirical data raise questions about the "clinical sensitivity" of MMPI-2-RF scales, identify an extensive literature relevant to forensic use of the MMPI-2-RF that Butcher and colleagues have systematically ignored, and identify a series of logical and factual fallacies along with new and repeated errors of omission and commission in Butcher et al.'s response.

The cross-national structure of mental disorders: results from the World Mental Health Surveys

BACKGROUND

The patterns of comorbidity among mental disorders have led researchers to model the underlying structure of psychopathology. While studies have suggested a structure including internalizing and externalizing disorders, less is known with regard to the cross-national stability of this model. Moreover, little data are available on the placement of eating disorders, bipolar disorder and psychotic experiences (PEs) in this structure.

METHODS

We evaluated the structure of mental disorders with data from the World Health Organization Composite International Diagnostic Interview, including 15 lifetime mental disorders and six PEs. Respondents (n = 5478-15 499) were included from 10 high-, middle- and lower middle-income countries across the world aged 18 years or older. Confirmatory factor analyses (CFAs) were used to evaluate and compare the fit of different factor structures to the lifetime disorder data. Measurement invariance was evaluated with multigroup CFA (MG-CFA).

RESULTS

A second-order model with internalizing and externalizing factors and fear and distress subfactors best described the structure of common mental disorders. MG-CFA showed that this model was stable across countries. Of the uncommon disorders, bipolar disorder and eating disorder were best grouped with the internalizing factor, and PEs with a separate factor.

CONCLUSIONS

These results indicate that cross-national patterns of lifetime common mental-disorder comorbidity can be explained with a second-order underlying structure that is stable across countries and can be extended to also cover less common mental disorders.

Evaluating dimensional models of psychopathology in outpatients diagnosed with emotional disorders: A cautionary tale

BACKGROUND

Mental disorders cluster together systematically. Through factor analysis of disorder comorbidity, investigators are establishing the latent dimensions that underlie the development of related syndromes. However, these dimensions have not been validated across diverse patient samples, in which comorbidity patterns vary widely.

METHOD

We assessed 4,928 outpatients seeking treatment for emotional disorders with a semistructured diagnostic interview. This was the largest patient sample as yet for an evaluation of the latent structure of mental disorders. We compared several competing dimensional models of common mental disorders via confirmatory factor analysis.

RESULTS

The hypothesized confirmatory factor model-anchored by internalizing and externalizing spectra-fit the diagnostic data poorly. Neither a one-factor model, reflecting a unitary liability to all mental disorders, nor a three-factor model, wherein the internalizing dimension bifurcated into distress and fear subfactors, fit appreciably better.

CONCLUSIONS

These data provide novel evidence that the internalizing and externalizing spectra are not structurally sound in all clinical contexts. We speculate about the causes of model misfit and advise additional research into the generalizability-with respect to sample, input data, developmental stage, and more-of dimensional models of mental disorder.

Examination of the indirect effects of combat exposure on suicidal behavior in veterans

BACKGROUND

Researchers have theorized that increased rates of suicide in the military are associated with combat exposure; however, this hypothesis has received inconsistent support in the literature, potentially because combat exposure may be indirectly related to suicide risk through its influence on posttraumatic stress disorder (PTSD) and depressive symptoms. The current study tested the hypothesis that combat exposure has a significant indirect effect on suicidal behavior among Iraq/Afghanistan-era veterans through its effects on PTSD-depressive symptomatology.

METHODS

Iraq/Afghanistan-era veterans (N = 3,238) participated in a cross-sectional, multi-site study of post-deployment mental health consisting of clinical interviews and self-report questionnaires. Structural equation modeling (SEM) was used to examine direct and indirect relationships between three latent variables: combat exposure, PTSD-depression, and suicidal behavior (past attempts and current ideation, intent, and preparation).

RESULTS

A partial mediation model was the best-fitting model for the data. Combat exposure was significantly associated with PTSD-depression (β = 0.50, p < .001), which was in turn associated with suicidal behavior (β = 0.62, p < .001). As expected, the indirect effect between combat exposure and suicidal behavior was statistically significant, β = 0.31, p < .001.

LIMITATIONS

Data were cross-sectional, and suicidal behavior was measured via self-report.

CONCLUSIONS

Results indicated that combat exposure was indirectly related to suicidal behavior via PTSD-depressive symptomatology. Findings lend support for a higher-order combined PTSD-depression latent factor and suggest that Iraq/Afghanistan-era veterans with high levels of PTSD-depressive symptoms are at increased risk for suicidal behavior.

The generalizability of the structure of substance abuse and antisocial behavioral syndromes: A systematic review

BACKGROUND

Although several authors have suggested that a single externalizing spectrum encompassing both antisocial behavioral syndromes and substance use disorder is to be preferred, this assumption has not been evaluated systematically throughout studies.

PURPOSE

The objective was to establish the generalizability of transdiagnostic models of externalizing disorders across different types of disorders and populations, in regard to the strength of the evidence.

METHOD

We conducted a systematic literature review using combinations of two sets of keywords: 1) "antisocial", "externalizing", "conduct disorder", "disruptive behavior disorder", "substance abuse", "substance-related disorder", "cannabis", "cocaine", "hallucinogen", "alcoholism", "opioid"; 2) "latent structure", "factor analysis", "multivariate analysis".

RESULTS

Models supporting a superordinate factor appeared dominant in a limited set of different populations, on which the majority of the research sample was focused.

CONCLUSIONS

Although the externalizing spectrum model is a promising angle for future research and treatment, extending research on this model in a higher diversity of populations is recommended to enhance the understanding and applicability of the externalizing spectrum model.

Mapping emotional disorders at the finest level: Convergent validity and joint structure based on alternative measures

BACKGROUND

Traditional categorization of emotional disorders suffers from within-disorder heterogeneity and excessive comorbidity. Quantitative nosology instead proposes grouping homogenous components of these disorders within a higher order internalizing dimension. However, the precise number, composition, and hierarchical structure of these components remains unclear and varies based on assessment tools.

METHODS

The present study jointly examined two assessment systems with the broadest coverage of homogeneous emotional disorder components-the revised Interview for Mood and Anxiety Symptoms (IMAS-R) and the self-report-based expanded version of the Inventory of Depression and Anxiety Symptoms (IDAS-II)-to map their convergent and discriminant validity and joint structure in outpatient (N=426) and treated student (N=306) samples.

RESULTS

Results identified 33 non-redundant components of emotional disorders. Most demonstrated strong convergent and discriminant validity between these two instruments. However, the IMAS-R provided more detailed and differentiated characterization of the content subsumed within three IDAS-II scales, and seven of the 33 components were unique to one measure or the other. Joint analysis of scales from both measures supported a four factor (i.e., distress, fear, OCD, mania) mid-level structure of emotional disorders.

CONCLUSIONS

Using multiple measures, methods, and samples, the present study provided evidence for the validity of core lower order components of the internalizing dimension and suggested they cluster into as many as four distinct factors reflecting distress, fear, OCD, and mania.

A comparison and integration of structural models of depression and anxiety in a clinical sample: Support for and validation of the tri-level model

Prominent structural models of depression and anxiety arise from 2 traditions: (a) the tripartite/integrative hierarchical model based on symptom dimensions, and (b) the fear/anxious-misery model based on diagnostic comorbidity data. The tri-level model of depression and anxiety was developed to synthesize these structural models, postulating that narrow (disorder-specific), intermediate (fear and anxious-misery), and broad (general distress) structural factors are needed to most fully account for covariation among these symptoms. Although this model has received preliminary support (Prenoveau et al., 2010), the current study compares it with the above established models and seeks to validate the best-fitting structure. We evaluated the tri-level model and alternative structural models in a large clinical sample (N = 1,000) using bifactor analysis. In exploratory and confirmatory subsamples, the tri-level model provided a good fit to the data and each of the 3 levels (narrow, intermediate, and broad) accounted for substantial variance; this model provided a superior fit relative to more parsimonious competing structural models. Furthermore, impairment was independently associated with all 3 levels of the tri-level model, comorbidity was most closely linked to the broad tri-level dimensions, and the factors generally showed the expected convergent/discriminant associations with diagnoses. Results suggested several revisions to prior research: (a) worry may be best modeled at the broadest structural level, rather than as an indicator of anxious-misery or fear; (b) social interaction anxiety may belong with anxious-misery, rather than fear; and (c) obsessive-compulsive disorder is generally associated with fear disorders, but hoarding is associated with both fear and anxious-misery. (PsycINFO Database Record

The Influence of Social Support on Dyadic Functioning and Mental Health Among Military Personnel During Postdeployment Reintegration

OBJECTIVES

Although many service members successfully cope with exposure to stress and traumatic experiences, others have symptoms of depression, posttraumatic stress disorder (PTSD), and anxiety; contextual factors may account for the variability in outcomes from these experiences. This work sought to understand mechanisms through which social support influences the mental health of service members and whether dyadic functioning mediates this relationship.

METHODS

We collected cross-sectional data as part of a larger study conducted in 2013; 321 military personnel who had at least 1 deployment were included in these analyses. Surveys were completed online; we collected data on demographic characteristics, social support, mental health measures (depression, PTSD, and anxiety), and dyadic functioning. We performed process modeling through mediation analysis.

RESULTS

The direct effects of social support on the mental health of military personnel were limited; however, across all types of support networks, greater social support was significantly associated with better dyadic functioning. Dyadic functioning mediated the relationships between social support and depression/PTSD only when social support came from nonmilitary friends or family; dyadic functioning mediated social support and anxiety only when support came from family. We found no indirect effects of support from military peers or military leaders.

CONCLUSION

Findings here highlight the need to continue to explore ways in which social support, particularly from family and nonmilitary-connected peers, can bolster healthy intimate partner relationships and, in turn, improve the well-being of military service members who are deployed.

Effects of a brief anxiety sensitivity reduction intervention on obsessive compulsive spectrum symptoms in a young adult sample

OBJECTIVE

Anxiety sensitivity (AS) has been identified as a transdiagnostic cognitive risk factor for a wide range of affective disorders, including conditions within the obsessive compulsive (OC) spectrum. A growing body of research has demonstrated that directly reducing AS leads to subsequent reductions of other psychiatric symptoms, including anxiety, worry, and mood. To date, no study has examined the efficacy of a brief AS intervention on reducing OC and hoarding symptoms.

METHOD

Non-treatment seeking young adults (N = 104; 83.7% female; 81.7% Caucasian) were selected for having elevated levels of AS, and were then randomized into a single-session, computer-assisted AS intervention or a control condition. OC and hoarding symptoms were assessed at post-treatment, as well as at one week and one month follow-ups.

RESULTS

Results revealed that the intervention, but not the control condition, reduced OC symptoms across the post-intervention follow-up period. Mediation analysis demonstrated that changes in AS mediated changes in OC symptoms due to the intervention. In contrast, the intervention did not have a specific effect on reducing hoarding symptoms.

CONCLUSIONS

These findings have important ramifications for understanding the relationship between AS and OC spectrum symptoms, and raise interesting treatment and prevention implications.

Longitudinal associations between post-traumatic stress disorder and metabolic syndrome severity

BACKGROUND

Post-traumatic stress disorder (PTSD) is associated with elevated risk for metabolic syndrome (MetS). However, the direction of this association is not yet established, as most prior studies employed cross-sectional designs. The primary goal of this study was to evaluate bidirectional associations between PTSD and MetS using a longitudinal design.

METHOD

A total of 1355 male and female veterans of the conflicts in Iraq and Afghanistan underwent PTSD diagnostic assessments and their biometric profiles pertaining to MetS were extracted from the electronic medical record at two time points (spanning ~2.5 years, n = 971 at time 2).

RESULTS

The prevalence of MetS among veterans with PTSD was just under 40% at both time points and was significantly greater than that for veterans without PTSD; the prevalence of MetS among those with PTSD was also elevated relative to age-matched population estimates. Cross-lagged panel models revealed that PTSD severity predicted subsequent increases in MetS severity (β = 0.08, p = 0.002), after controlling for initial MetS severity, but MetS did not predict later PTSD symptoms. Logistic regression results suggested that for every 10 PTSD symptoms endorsed at time 1, the odds of a subsequent MetS diagnosis increased by 56%.

CONCLUSIONS

Results highlight the substantial cardiometabolic concerns of young veterans with PTSD and raise the possibility that PTSD may predispose individuals to accelerated aging, in part, manifested clinically as MetS. This demonstrates the need to identify those with PTSD at greatest risk for MetS and to develop interventions that improve both conditions.

Polygenic Risk for Externalizing Psychopathology and Executive Dysfunction in Trauma-Exposed Veterans

The frequent co-occurrence of antisocial behavior and other disinhibited phenotypes reflects a highly heritable externalizing spectrum. We examined the molecular genetic basis of this spectrum by testing polygenic associations with psychopathology symptoms, impulsive traits, and cognitive functions in two samples of primarily military veterans (n =537, n =194). We also investigated whether polygenic risk for externalizing moderated the effects of trauma on these phenotypes. As hypothesized, polygenic risk positively predicted externalizing psychopathology and negatively predicted performance on inhibitory control tasks. Gene-by-environment effects were also evident, with trauma exposure predicting greater impulsivity and less working memory capacity, but only at high levels of genetic liability. As expected, polygenic risk was not associated with internalizing psychopathology or episodic memory performance. This is the first independent replication of the polygenic score as a measure of genetic predispositions for externalizing and provides preliminary evidence that executive dysfunction is a heritable vulnerability for externalizing psychopathology.

The shared and specific relationships between exposure to potentially traumatic events and transdiagnostic dimensions of psychopathology

The experience of traumatic events has been linked to the development of psychopathology. Changing perspectives on psychopathology have resulted in the hypothesis that broad dimensional constructs account for the majority of variance across putatively distinct disorders. As such, traumatic events may be associated with several disorders due to their relationship with these broad dimensions rather than any direct disorder-specific relationship. The current study used data from 8871 Australians to test this hypothesis. Two broad dimensions accounted for the majority of relationships between traumatic events and mental and substance use disorders. Direct relationships remained between post-traumatic stress disorder and six categories of traumatic events in the total population and between drug dependence and accidents/disasters for males only. These results have strong implications for how psychopathology is conceptualized and offer some evidence that traumatic events are associated with an increased likelihood of experiencing psychopathology in general.

Personality traits and combat exposure as predictors of psychopathology over time

BACKGROUND

Research suggests that personality traits have both direct and indirect effects on the development of psychological symptoms, with indirect effects mediated by stressful or traumatic events. This study models the direct influence of personality traits on residualized changes in internalizing and externalizing symptoms following a stressful and potentially traumatic deployment, as well as the indirect influence of personality on symptom levels mediated by combat exposure.

METHOD

We utilized structural equation modeling with a longitudinal prospective study of 522 US National Guard soldiers deployed to Iraq. Analyses were based on self-report measures of personality, combat exposure, and internalizing and externalizing symptoms.

RESULTS

Both pre-deployment Disconstraint and externalizing symptoms predicted combat exposure, which in turn predicted internalizing and externalizing symptoms. There was a significant indirect effect for pre-deployment externalizing symptoms on post-deployment externalizing via combat exposure (p < 0.01). Negative Emotionality and pre-deployment internalizing symptoms directly predicted post-deployment internalizing symptoms, but both were unrelated to combat exposure. No direct effects of personality on residualized changes in externalizing symptoms were found.

CONCLUSIONS

Baseline symptom dimensions had significant direct and indirect effects on post-deployment symptoms. Controlling for both pre-exposure personality and symptoms, combat experiences remained positively related to both internalizing and externalizing symptoms. Implications for diagnostic classification are discussed.

The epidemiology of substance use disorders in US Veterans: A systematic review and analysis of assessment methods

BACKGROUND

Substance use disorders (SUDs), which encompass alcohol and drug use disorders (AUDs, DUDs), constitute a major public health challenge among US veterans. SUDs are among the most common and costly of all health conditions among veterans.

OBJECTIVES

This study sought to examine the epidemiology of SUDs among US veterans, compare the prevalence of SUDs in studies using diagnostic and administrative criteria assessment methods, and summarize trends in the prevalence of SUDs reported in studies sampling US veterans over time.

METHODS

Comprehensive electronic database searches were conducted. A total of 3,490 studies were identified. We analyzed studies sampling US veterans and reporting prevalence, distribution, and examining AUDs and DUDs.

RESULTS

Of the studies identified, 72 met inclusion criteria. The studies were published between 1995 and 2013. Studies using diagnostic criteria reported higher prevalence of AUDs (32% vs. 10%) and DUDs (20% vs. 5%) than administrative criteria, respectively. Regardless of assessment method, both the lifetime and past year prevalence of AUDs in studies sampling US veterans has declined gradually over time.

CONCLUSION

The prevalence of SUDs reported in studies sampling US veterans are affected by assessment method. Given the significant public health problems of SUDs among US veterans, improved guidelines for clinical screening using validated diagnostic criteria to assess AUDs and DUDs in US veteran populations are needed.

SCIENTIFIC SIGNIFICANCE

These findings may inform VA and other healthcare systems in prevention, diagnosis, and intervention for SUDs among US veterans.

Patterns of DSM-5 posttraumatic stress disorder and depression symptoms in an epidemiological sample of Chinese earthquake survivors: A latent profile analysis

BACKGROUND

Posttraumatic stress disorder (PTSD) and depression are highly comorbid in association with serious clinical consequences. Nevertheless, to date, no study using latent class or latent profile analysis (LCA/LPA) has examined patterns of co-occurring PTSD and depression symptoms among natural disaster survivors, nor has the distinctiveness of DSM-5 PTSD and depression symptoms been clarified in the aftermath of trauma. This study was primarily aimed at filling these gaps.

METHODS

LPA was used to examine self-reported PTSD and depression symptoms in an epidemiological sample of 1196 Chinese earthquake survivors.

RESULTS

A 4-class solution characterized by low symptoms (53.9%), predominantly depression (18.2%), predominantly PTSD (18.9%) and combined PTSD-depression (9.0%) patterns fit the data best. Demographic characteristics and earthquake-related exposures were specifically or consistently associated with the non-parallel profiles varying in physical health impairment.

LIMITATIONS

A sample exposed to specific traumatic events was assessed by self-report measures.

CONCLUSIONS

The distinctiveness of DSM-5 PTSD and depression symptoms following an earthquake suggests that PTSD and depression may be independent sequelae of psychological trauma rather than a manifestation of a single form of psychopathology. The current findings support the distinction between PTSD and depression constructs, and highlight the need for identifications of natural disaster survivors at high risk for PTSD and/or depression, and interventions individually tailored to one's symptom presentations.

Examination of the relations between obsessive-compulsive symptom dimensions and fear and distress disorder symptoms

BACKGROUND

Whereas prior work has established fear and distress clusters underlying unipolar mood and anxiety disorders, the optimal placement of obsessive-compulsive disorder (OCD) within this model is unclear. One likely contributor to this ambiguity is the heterogeneous nature of OCD. There is increasing evidence for distinct symptom dimensions that are more homogenous than the broad OCD phenotype. Using structural equation modeling, the current study examined the relations between various OCD symptom dimensions and symptoms associated with fear/distress disorders.

METHODS

Participants included 526 individuals recruited from an online crowdsourcing marketplace.

RESULTS

Results revealed that the symmetry obsessions/arranging compulsions, harm obsessions/checking compulsions, and unacceptable thoughts/neutralizing compulsions were related to both fear and distress disorder symptoms, whereas the contamination obsessions/washing compulsions dimension of OCD was specifically related to fear disorder symptoms.

LIMITATIONS

Limitations include the use of self-report questionnaires to measure all constructs of interest.

CONCLUSIONS

These findings add to a growing body of literature attesting to the multidimensional nature of OCD and progress our understanding of the etiological underpinnings of this severe and debilitating condition.

The structure and short-term stability of the emotional disorders: a dimensional approach

BACKGROUND

Factor-analytic studies have found that depressive, bipolar, post-traumatic, obsessive-compulsive, and anxiety disorders - jointly referred to as the emotional disorders - form an internalizing spectrum that includes distress and fear subfactors. However, placement of some disorders is uncertain. Also, prior research analysed dichotomous interview-based diagnoses or dimensional self-report measures. We investigated this structure using a third-generation measure - the Interview for Mood and Anxiety Symptoms (IMAS) - that combines strengths of a clinical interview with dimensional assessment.

METHOD

The interview was administered to 385 students and 288 psychiatric out-patients. Participants were reinterviewed 2 months later.

RESULTS

Exploratory and confirmatory factor analyses identified three factors: distress (depression, generalized anxiety, post-traumatic stress, irritability, and panic syndrome); fear (social anxiety, agoraphobia, specific phobia, and obsessive-compulsive); and bipolar (mania and obsessive-compulsive). The structure was consistent over time and across samples, except that panic and agoraphobia had higher factor loadings in patients. Longitudinal analyses revealed high temporal stability of the factors (test-retest r = 0.72 to 0.87), but also substantial disorder-specific stability.

CONCLUSIONS

This investigation - which bridges diagnostic and self-report studies - found three subfactors of internalizing psychopathology. It provided support for a new subfactor, clarified the placement of obsessive-compulsive and bipolar disorders, and demonstrated that this model generalizes across populations. The accumulating research suggests the need to recognize formally the close links among the emotional disorders, as well as empirical clusters within this spectrum. The IMAS demonstrated strong psychometric properties and can be useful for various research and clinical applications by providing dimensional, interview-based assessment of the emotional disorders.

DSM-5 personality traits discriminate between posttraumatic stress disorder and control groups

The relevance of personality traits to the study of psychopathology has long been recognized, particularly in terms of understanding patterns of comorbidity. In fact, a multidimensional personality trait model reflecting five higher-order personality dimensions-negative affect, detachment, antagonism, disinhibition, and psychoticism-is included in the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) and represented in the Personality Inventory for DSM-5 (PID-5). However, evaluation of these dimensions and underlying personality facets within clinical samples has been limited. In the present study, we utilized the PID-5 to evaluate the personality profile elevation and composition of 150 control veterans and 35 veterans diagnosed with posttraumatic stress disorder (PTSD). Results indicated that veterans with PTSD endorsed significantly more personality pathology than control veterans, with scores on detachment and psychoticism domains most clearly discriminating between the two groups. When personality domain scores were considered as parts of each subject's personality profile, a slightly different picture emerged. Specifically, the PTSD composition was primarily characterized by detachment and negative affect, followed by disinhibition, psychoticism, and antagonism in that order of relative importance. The profile of the control group was significantly different, mostly accounted for differences in antagonism and psychoticism. Using these complementary analytic strategies, the findings demonstrate the relevance of personality pathology to PTSD, highlight internalizing features of PTSD, and pave the way for future research aimed at evaluating the role of shared maladaptive personality traits in underlying the comorbidity of PTSD and related disorders.

Specific Associations between Anxiety Sensitivity Dimensions and Fear and Distress Dimensions of Emotional Distress Disorders

Anxiety sensitivity (AS) comprises three lower-order dimensions, physical concerns, cognitive concerns, and social concerns, all of which are related to unipolar mood and anxiety disorders (emotional distress disorders). The pattern of these relations suggests that AS cognitive concerns might be best classified as associated with emotional distress disorders clustered together as distress disorders whereas AS physical concerns might be best classified as associated with emotional distress disorders clustered together as fear disorders. In contrast, AS social concerns appears to be generally associated with both fear and distress disorders. To test the specificity of lower-order AS dimensions, structural equation modeling was employed in a sample of 579 individuals (M age = 36.87 years, SD = 13.47; 51.6% male) constituting a sample at risk for psychopathology as these individuals were seeking smoking cessation treatment. AS physical concerns was associated with the fear disorders dimension, even when controlling for negative affect (NA). AS cognitive concerns was associated with the distress disorder dimension, only when the effects of NA were not included. Finally, AS social concerns demonstrated non-specific relations with both the distress and fear disorders dimensions. Given that measures of AS and psychopathology were collected concurrently, these findings cannot address the role of lower-order AS dimensions as risk factors for specific psychopathology clusters. These results provide further support for the hierarchical model of emotional distress disorders as well as implicate AS cognitive and physical concerns as important variables at the intermediate level of this model.

Maladaptive autonomic regulation in PTSD accelerates physiological aging

A core manifestation of post-traumatic stress disorder (PTSD) is a disconnection between physiological state and psychological or behavioral processes necessary to adequately respond to environmental demands. Patients with PTSD experience abnormal oscillations in autonomic states supporting either fight and flight behaviors or withdrawal, immobilization, and dissociation without an intervening “calm” state that would provide opportunities for positive social interactions. This defensive autonomic disposition is adaptive in dangerous and life threatening situations, but in the context of every-day life may lead to significant psychosocial distress and deteriorating social relationships. The perpetuation of these maladaptive autonomic responses may contribute to the development of comorbid mental health issues such as depression, loneliness, and hostility that further modify the nature of cardiovascular behavior in the context of internal and external stressors. Over time, changes in autonomic, endocrine, and immune function contribute to deteriorating health, which is potently expressed in brain dysfunction and cardiovascular disease. In this theoretical review paper, we present an overview of the literature on the chronic health effects of PTSD. We discuss the brain networks underlying PTSD in the context of autonomic efferent and afferent contributions and how disruption of these networks leads to poor health outcomes. Finally, we discuss treatment approaches based on our theoretical model of PTSD.