Longitudinal Associations Among Pain, Posttraumatic Stress Disorder Symptoms, and Stress Appraisals

Differential Pain Presentations Observed Across Post-Traumatic Stress Disorder Symptom Trajectories After Combat Injury

OBJECTIVE

This study evaluated the association between pain outcomes and post-traumatic stress disorder (PTSD) symptom trajectories after combat-related injury, while adjusting for receipt of regional anesthesia (RA) soon after injury.

METHODS

The PTSD symptom trajectories of N = 288 combat-injured service members were examined from within a month of injury up to two-years after. Linear mixed-effects models evaluated the association between PTSD symptom trajectories and average pain and pain interference outcomes while adjusting for receipt of RA during combat casualty care.

RESULTS

Four PTSD trajectories were characterized: resilient, recovering, worsening, and chronic. Differential pain presentations were associated with PTSD symptom trajectories, even after adjusting for receipt of RA. Compared to those with a resilient PTSD symptom trajectory, individuals presenting with chronic PTSD trajectories were estimated to experience average pain scores 2.61 points higher (95% CI: 1.71, 3.14). Participants presenting with worsening (β = 1.42; 95% CI: 0.77, 1.78) and recovering PTSD trajectories (β = 0.65; 95% CI: 0.09, 1.08) were estimated to experience higher average pain scores than participants with resilient PTSD trajectories. Significant differences in pain interference scores were observed across PTSD trajectories. Receiving RA was associated with improved pain up to two years after injury (β =-0.31; 95% CI: -0.90, -0.04), however no statistically significant association was detected between RA and PTSD trajectories.

CONCLUSIONS

PTSD trajectories were associated with greater pain intensity and interference following combat injury even when accounting for receipt of early RA for pain management. These findings underscore the need to jointly assess pain and PTSD symptoms across the trauma care continuum.

Early Pain and Other Somatic Symptoms Predict Posttraumatic Stress Reactions in Survivors of Terrorist Attacks: The Longitudinal Utøya Cohort Study

Survivors of traumatic events commonly suffer from long-term pain and related somatic symptomatology. To test the predominant hypothesis that survivors' pain comprises sequela of persistent posttraumatic stress symptoms (PTSS), we assessed the sequential order of symptom development among young survivors of a terrorist attack. All 490 survivors of the 2011 Utøya (Norway) attacks were invited to the longitudinal Utøya cohort study; 355 (72.4%) participated. The mean survivor age was 19.3 years (SD = 4.6) and 169 were female (47.6%). Somatic symptoms, including headache, other pain and fatigue, and PTSS, were measured 4-5 months (T1), 14-16 months (T2), and 32-33 months (T3) after the attack. Longitudinal associations between somatic symptoms and PTSS were assessed in cross-lagged structural equation model (SEM) analyses, which were adjusted for known confounders. Higher pain levels and other somatic symptoms at T1 consistently predicted PTSS at T2 in SEM analyses, r = .473, p < .001. Beyond this early-to-intermediate posttraumatic phase, somatic symptoms did not significantly predict PTSS: T2-T3, r = .024, p = .831; T1-T3, r = -.074, p = .586. PTSS did not significantly predict later somatic symptomatology at T1-T2, r = .093, p = .455; T2-T3, r = .272, p = .234; or T1-T3, r = -.279, p = .077. The findings indicate that survivors' early pain and related somatic symptoms strongly and consistently predict later psychopathology. After severe psychological trauma, early interventions may need to address individuals' pain to hinder chronification.

Outcomes after traffic injury: mental health comorbidity and relationship with pain interference

BACKGROUND

Mental health symptoms, like depressive mood (DM) and post-traumatic stress (PTS), and pain interference (PI) with daily functioning often co-occur following traffic injury and their comorbidity can complicate recovery. This study aimed to map the course and overlapping trajectories of mental health symptoms, and associations with PI in a traffic injury population.

METHODS

In total, 2019 adults sustaining minor-to-moderate traffic injury were recruited within 28 days post-injury and assessed using phone interviews at 1, 6 and 12-months post-injury. Trajectories of DM, PTS and PI were established and relationships between DM, PTS and PI trajectories were explored using dual trajectory modelling. Bio-psychosocial predictors (e.g. pre-injury health, catastrophizing, acute distress, quality of life, social support) of mental health trajectories were investigated.

RESULTS

Up to five typical post-trauma trajectories were identified for DM, PTS and PI. Most people were in a resilient mental health trajectory (over 60%, DM or PTS), or in a chronic PI trajectory (almost 60%) 12 months post-injury. While recovery/resilient mental health trajectories were strongly interrelated (73.4% joint probability and > 94% conditional probabilities), DM/PTS comorbidity in chronic trajectories was not straightforward, suggesting a possibly asymmetric relationship. That is, persistent DM was more likely associated with persistent PTS (90.4%), than vice versa (31.9%), with a 22.5% probability that persistent PTS was associated with none or milder depression (i.e. following a recovery/resilient DM trajectory). An asymmetrical relationship was also found between mental health and PI. The majority of those with persistent PI were likely to be in a recovery/resilient DM/PTS trajectory (almost 70%), but those in a non-resilient DM/PTS trajectory showed a high risk of persistent PI. Predictors of non-resilient mental health trajectories included poorer pre-injury health and social support, and shared factors like acute psychological distress and pain catastrophizing.

CONCLUSIONS

Strong interrelations were confirmed between mental health symptoms and PI following traffic injury. However, persistent DM was more strongly linked to persistent PTS, than vice versa. Persistent PI was only linked with persistent DM/PTS in vulnerable subgroups. Early psychiatric/psychological interventions should target elevated psychological distress and negative appraisals in vulnerable individuals, to reduce long-term mental health morbidity/comorbidity and PI.

TRIAL REGISTRATION

ACTRN12613000889752.

Bidirectionality of Pain Interference and PTSD Symptoms in Military Veterans: Does Injury Status Moderate Effects?

OBJECTIVE

Pain and post-traumatic stress disorder (PTSD) symptoms are strongly correlated in veteran populations. Arguments for which one condition predicts or worsens the other condition have gone in both directions. However, research addressing this issue has been primarily limited to cross-sectional studies rather than examinations of a potential bidirectional relationship between pain interference and PTSD symptoms over time. In addition, no studies have examined deployment injury status as potentially moderating this bidirectional effect in veterans. To address these gaps in the literature, the present longitudinal study examined whether there is a bidirectional relationship between pain interference and PTSD symptoms in a sample of male and female veterans returning from Operation Iraqi Freedom, Operation Enduring Freedom, or Operation New Dawn (N = 729) and whether deployment injury status moderates this relationship.

METHODS

Participants completed phone interviews regarding pain interference and PTSD symptoms at three time points, each three months apart.

RESULTS

Pain interference at Time 1 predicted worse PTSD symptoms at Time 2 for the subset of veterans who sustained injuries during deployment (n = 381) but not for veterans with pain interference who did not sustain injuries (n = 338). From Time 1 to Time 3, elevations in PTSD symptoms were mediated by pain interference for injured veterans; in contrast, PTSD symptoms did not appear to drive changes in pain interference in either group.

CONCLUSIONS

These results indicate that physical symptom management should be a crucial target of psychological intervention for returning veterans with PTSD symptoms and deployment-related injuries.

PTSD in Court I: Introducing PTSD for Court

The first part of the series of three articles on posttraumatic stress disorder (PTSD) in Court to appear in the journal reviews the history of the construct of PTSD and its presentation in the DSM-5 (Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition; American Psychiatric Association, 2013) and the ICD-11 (International Classification of Diseases, 11th Edition; World Health Organization, 2018). There are 20 symptoms of PTSD in the DSM-5. PTSD symptoms are arranged into a four-cluster model, which has received partial support in the literature. Other four-factor models have been found that fit the data even better than that of the DSM-5. There is a five-factor dysphoria model and two six-factor models that have been found to fit better the DSM-5 PTSD symptoms. Finally, research is providing support for a hybrid seven-factor model. An eighth factor on dissociation seems applicable to the minority of people who express the dissociative subtype. At the epidemiological level, individuals can expect trauma exposure to take place about 70% over one's lifetime. Also, traumatic exposure leads to traumatic reactions in about 10% of cases, with PTSD being a primary diagnosis for trauma. Once initiated, PTSD becomes prolonged in about 10% of cases. Polytrauma and comorbidities complicate these prevalence statistics. Moreover, the possibility of malingered PTSD presents confounds. However, the estimate for malingered PTSD varies extensively, from 1 to 50%, so that the estimate is too imprecise for use in court without further research. This first article in the series of three articles appearing in the journal on PTSD in Court concludes with discussion of complications related to comorbidities and heterogeneities, in particular. For example, PTSD and its comorbidities can be expressed in over one quintillion ways. This complexity in its current structure in the DSM-5 speaks to the individual differences involved in its expression.