Pain perception and modulation in ex-POWs who underwent torture: The role of subjective and objective suffering

Traumatic Life Experience and Pain Sensitization: Meta-analysis of Laboratory Findings

OBJECTIVES

Psychological trauma often co-occurs with pain. This relationship has been explored using laboratory pain measures; however, findings have been mixed. Previous studies have limited operationalization of trauma (eg, posttraumatic stress disorder) or pain (eg, pain thresholds), which may contribute to conflicting results. Further, prior reviews likely underrepresent trauma experiences among people who are not receiving clinical care, limiting generalizability.

MATERIALS AND METHODS

We systematically reviewed the existing literature on the relationship between psychological trauma (eg, car accidents, sexual assault, childhood abuse, neglect) and laboratory pain (ie, quantitative sensory testing measures of pain threshold, intensity, summation, modulation), using inclusive criteria. The direction of the relationship between psychological trauma and pain sensitivity was evaluated, and moderation by purported pain mechanism (ie, pain detection, suprathreshold pain, central sensitization, inhibition) was explored.

RESULTS

Analyses were conducted using 48 studies that provided 147 effect sizes. A multivariate random-effects model with robust variance estimation resulted in a small but statistically significant overall effect size of g=0.24 (P=0.0002), reflecting a positive association between psychological trauma and enhanced laboratory pain sensitivity. Upon examination of mechanistic moderators, this relationship appears driven by effects on pain detection (g=0.28, P=0.002) and central sensitization (g=0.22, P=0.04). While effect sizes were similar across all moderators, effects on suprathreshold pain and inhibition were not statistically significant.

DISCUSSION

Findings demonstrate an overall pattern of trauma-related pain enhancement and point to central sensitization as a key underlying mechanism.

The associations of subjective appraisal of birth pain and provider-patient communication with postpartum-onset PTSD

Childbirth-related PTSD is generally believed to result from multiple factors, including negative objective and subjective experiences and patient predisposing factors. There is conflicting evidence regarding whether severe childbirth pain affects development of PTSD. We hypothesize that a woman's retrospective subjective appraisal of birth pain is a greater predictor of postpartum-onset PTSD than medically documented measures of pain, and that a positive subjective experience communicating with medical providers during labor also reduces risk for postpartum-onset PTSD. A sample of 112 women, who screened positive for psychopathology within a year postpartum, were interviewed probing for their subjective labor experiences. Interviews were coded for subjective labor pain perception and quality of provider communication. Regression analyses tested associations between subjective labor pain perception and quality of provider communication with postpartum PTSD. Pain scores recorded during labor were not significantly associated to probable PTSD at any recorded time point up to 12 months postpartum. Positive perception of birth pain was associated with reduced risk of probable PTSD at 6 weeks postpartum (aOR = 0.34, p = 0.03). Positive provider communication was associated with reduced risk of probable PTSD at 6 months (aOR = 0.29, p = 0.02) and 12 months (aOR = 0.2, p = 0.03) postpartum. Pain recorded during childbirth is not necessarily a negative experience leading to trauma. For some women, even severe pain may be seen positively, and lacks traumatizing elements. Interventions to positively shift women's childbirth pain appraisal and educate medical workforce in patient-provider communication may reduce rates of postpartum PTSD. ClinicalTrials.gov Indentifier: NCT03004872.

Addressing Suffering in Patients With Psychiatric Disorders

BACKGROUND

Patients with psychiatric disorders (as well as general medical conditions) often describe their lives in terms of suffering. Although suffering is honored as a central focus of physicians' concerns, it is not even indexed in the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition. Generally connoting severe, prolonged distress, suffering can be distinguished from pain, depression, and anxiety. The aims of this article are to consider whether attending to suffering per se in psychiatric patients merits attention independent of other commonly assessed psychiatric symptoms such as anxiety, depression, and conventional distress, and how targeting suffering per se might add value to psychiatric patient care.

METHODS

Sources for this article were obtained via a selective literature search in PubMed using the terms "suffering" in the title and the terms "psychiatric disorder," "mental illness," "assessment," "measurement," "scale," "existential suffering," and "unbearable suffering." Articles of interest were followed up using a snowball technique to examine "similar articles" and "cited by" titles to find additional pertinent articles.

RESULTS

Definitions of suffering in the medical literature stress its subjectivity, particularity, complexity, and connection to a wide variety of noxious sensations, as well as real and anticipated deficits, losses, and thwarted motivations. These can affect the entire spectrum of universal human needs, from basic biological issues through intrapsychic, interpersonal, and social issues, encompassing existential concerns of meaning, purpose, and transcendence. Based on these factors, a definition of suffering in patients with psychiatric disorders is proposed. Although efforts to measure suffering have been limited and numerous gaps in the literature are evident, several scales may offer suitable bases for the study of suffering in patients with psychiatric disorders.

CONCLUSIONS AND IMPLICATIONS

Ascertaining sources of suffering may require new types of inquiry and additional time. Well-described, evidence-informed strategies and time-honored psychotherapy techniques are available for addressing the numerous concerns that contribute to suffering. Patients with psychiatric disorders whose distinct, multidimensional sources of suffering are identified, acknowledged, and addressed may experience better treatment quality, greater treatment satisfaction, and possibly better outcomes than those whose clinicians' attention is limited to conventional psychiatric signs and symptoms.

Echoes from the past: adjustment of aging former prisoners of war to the COVID-19 pandemic

BACKGROUND

The aim of this study was to examine whether exposure to previous traumatic events is a risk factor for stress reactions during this pandemic. Capitalizing on a 29-year longitudinal study of Israeli ex-prisoners of war (ex-POWs) and combat veterans, we examined whether captivity is a risk factor for fear of coronavirus disease 2019 (COVID-19) and COVID-19-induced acute stress disorder (COVID-19 ASD) beyond the effects of combat exposure and other stressful life events. In addition, we examined the contribution of captivity experiences (severity of captivity, experience of solitary confinement, and suffering during captivity) and veterans' appraisal of the impact of their war-related experiences on adjustment to the current quarantine and isolation to fear of COVID-19 and COVID-19 ASD.

METHODS

One-hundred-and-twenty Israeli ex-POWs from 1973 Yom Kippur War and 65 matched controls (combat veterans from the same war) filled out self-report questionnaires 18 (T1), 35 (T2), 42 (T3), and 47 (T4) years after the war.

RESULTS

Findings revealed that although ex-POWs and controls did not differ in their level of exposure to COVID-19, ex-POWS reported higher levels of fear of COVID-19 and COVID-19 ASD than controls. Suffering during captivity, measured at 1991, and participants' appraisal of the extent to which their war-related experiences affected adjustment to COVID-19 were significantly associated with fear of COVID-19 and COVID-19 ASD.

CONCLUSIONS

The findings of the study demonstrate the long-term effects of exposure to traumatic experiences (captivity) during young adulthood on adjustment to an unrelated collective stress, such as COVID-19, 40 years later.