Pain catastrophizing may moderate the association between pain and secondary hyperalgesia

Experimental Pain Sensitivity and Parental Pain Catastrophizing

BACKGROUND/OBJECTIVES

Variability in biopsychosocial factors can explain the interindividual variability in pain. One factor that can impact pain is the pain catastrophizing level. Interestingly, parental pain catastrophizing is related to the severity of the clinical pain of their children. This study explored whether parental pain catastrophizing is also associated with their children's experimental pain sensitivity.

METHODS

Forty-five healthy girls (mean age 12.07 ± 1.47 years) and one of their parents participated in this study. Parents completed the Pain Catastrophizing Scale (PCS) about their child's pain (PCS-Parentchild) as well as their pain (PCS-Parent). Children completed the PCS about their pain (PCS-Child) and the Pubertal Developmental Scale (PDS). Children underwent psychophysical tests, including paradigms of temporal summation, heat- and pressure-conditioned pain modulation, offset analgesia, and cold pain tolerance. Correlations and regression models were conducted to assess the relationships between parental pain catastrophizing scales (separately for PCS-Parentchild and PCS-Parent) and experimental pain sensitivity with and without controlling for PCS-Child and PDS. T-tests were used to compare pain sensitivity between participants with vs. without a family history of psychiatric disorder.

RESULTS

No significant relationships were found between the experimental pain sensitivity measures and either PCS-Parentchild or PCS-Parent with and without controlling for PCS-Child and PDS. No differences were found in experimental pain sensitivity between participants with and without a family history of psychiatric disorder.

CONCLUSIONS

Parental pain catastrophizing may contribute minimally to the individual variability in experimental pain sensitivity of healthy adolescent girls.

Effects of chronic daily headache with subclinical depression on brain volume: A systematic review and meta-analysis

BACKGROUND AND OBJECTIVE

The relationship between chronic daily headache (CDH), depression symptoms, and brain volume remains unclear.

METHODS

To investigate the effects of CDH on brain volume and the impact of depressive symptoms (DSs) as well as the effects of demography and medication overuse, PubMed, Embase, and Web of Science databases were systematically searched using appropriate keyword strings to retrieve observational studies from inception to May 2023.

RESULTS

Two distinct comparisons were made in CDH patients: (1) those with DSs versus their pain-free counterparts and (2) those without DSs versus pain-free controls. The first comprised nine studies enrolling 225 CDH patients with DSs and 234 controls. Beck depression inventory, Hamilton depression scale, and Hospital anxiety/depression scale were used to assess DSs, revealing significantly more DSs in CDH patients with DSs compared to their controls (all p < 0.05). Besides, the second analysed four studies involving 117 CDH patients without DSs and 155 comparators. Compared to CDH patients without DSs, those with DSs had a smaller brain volume than controls (p = 0.03). Furthermore, CDH patients with DSs who did not overuse medications showed a smaller right cerebral cortical volume than overusers (p = 0.003). A significant inverse correlation between female prevalence and brain volume (p = 0.02) was revealed using regression analysis.

CONCLUSIONS

Pain-induced persistent depressive symptoms not only incur structural alterations but also encompass affective-motivational changes, involving medication use and gender-specific health concerns.

SIGNIFICANCE

This study highlighted the importance of an integrated CDH treatment, emphasizing psychological interventions for the affective-motivational component alongside pain management.

The Role of Pain Expectations in the Development of Secondary Pinprick Hypersensitivity: Behavioral-Neurophysiological Evidence and the Role of Pain-Related Fear

Secondary mechanical hypersensitivity, a common symptom of neuropathic pain, reflects increased responsiveness of nociceptive pathways and can be induced temporarily in healthy volunteers using high-frequency electrical stimulation of the skin. Expectations modulate acute pain perception and fear of pain has been shown to attenuate and amplify the placebo and nocebo effects, respectively. However, the role of expectations and fear in the development of mechanical secondary hypersensitivity remains unclear. The modulatory role of fear and expectations in the development of mechanical secondary hypersensitivity remains so far mainly correlational. Here, we randomly assigned healthy participants (women) to a placebo, nocebo, or control group. In the experimental groups, participants' expectations of pain were manipulated using verbal suggestions accompanied by an inert treatment. Fear of pain was evaluated both in terms of fear of pain and via questionnaires. Sensitivity to mechanical stimulation was assessed by self-reported pinprick ratings before and after high-frequency stimulation; pinprick-evoked potentials elicited by the stimulation were recorded. The placebo group developed the least mechanical secondary hypersensitivity (smaller proximal-distal spread), while the nocebo group developed the most, but only when outliers were excluded. Higher expectations of pain predicted a greater development of mechanical secondary hypersensitivity. Anticipatory pain-related fear only mediated the relationship between unpleasantness expectations and perceived pinprick unpleasantness. Dispositional fear of pain moderated the relationship between expectations and the perceived intensity and unpleasantness of pinpricks. No group differences were observed in pinprick-evoked potentials. We provide preliminary evidence that both expectations and fear impact the development of mechanical secondary hypersensitivity. PERSPECTIVE: Expectations of pain may influence the development of secondary mechanical hypersensitivity. This effect is moderated by dispositional fear of pain and partially mediated by situational fear of pain.

Exposure to Potentially Traumatic Events, Posttraumatic Stress Symptoms, Pain Catastrophizing, and Functional Somatic Symptoms Among Individuals With Varied Somatic Symptoms: A Moderated Mediation Model

The relationships between exposure to potentially traumatic events (PTEs), as well as posttraumatic stress symptoms (PTSS) and somatic syndromes, have recently been exemplified. Exposure to PTEs can also set in motion complex psychological processes such as pain catastrophizing that is associated with PTSS and somatic syndromes. However, the specific moderating role of pain catastrophizing in these links remains relatively unexamined. The present study aims to assess a moderated mediation model in which catastrophizing will moderate the indirect effect of exposure to PTEs on the number of somatic symptoms and chronic pain severity via PTSS, among individuals with somatic syndromes. A volunteers' sample of 175 Israeli adults with varied somatic symptoms responded to online validated self-report questionnaires in a cross-sectional designed study. Participants' self-reported PTSS rates (57.1%) were high. PTSS and pain catastrophizing, but not exposure to PTEs, were related to chronic pain severity. Interestingly, a moderated mediation analysis indicated that the indirect effect of catastrophizing in the relation between exposure to PTEs and the number of somatic symptoms via PTSS existed only among those with high levels of catastrophizing. The present study highlights the assumption that functional somatic syndromes (FSS) have much in common. Our findings support a moderated mediation model that begins with exposure to PTEs that leads to PTSS, which in turn increase the number of somatic symptoms. Higher levels of pain catastrophizing might attenuate this indirect link by affecting the interpretation of PTSS and create a vulnerability to more somatic symptoms. Thus, changes in cognitive-sensory processing in the form of catastrophic thinking can affect psychobiological processes and heighten sensitivity to stimuli arising in the body and should be considered as possible target for future research and psychological interventions.

Even mild catastrophic thinking is related to pain intensity in individuals with painful temporomandibular disorders

AIMS

Temporomandibular disorders (TMD) are often associated with psychological comorbidities. One such comorbidity is pain catastrophising, that is, exaggeration of negative consequences of a painful event. The aim was to investigate catastrophising in individuals with painful TMD compared to controls and the association between catastrophising and pain intensity, number of pain sites and functional limitations.

METHODS

A community-based sample of 110 individuals (83 women; 20-69 yrs) with painful TMDs (myalgia/arthralgia as per Diagnostic Criteria for TMD) and 190 age- and gender-matched controls (119 women; 20-69 yrs) from the Public Dental services in Västerbotten, Sweden, participated. Associations between catastrophising and functional jaw limitations, respectively, and painful TMD were evaluated with ordinal regression adjusted for the effect of gender and age. Associations (Spearman's correlation) of the Pain catastrophising Scale (PCS) with Jaw Functional Limitation Scale (JFLS-20), pain site number (whole-body pain map), and characteristic pain intensity (CPI) and intergroup comparisons (Mann-Whitney U test) of these variables were also calculated.

RESULTS

Levels of catastrophising were associated with TMD pain (OR 1.6, 95%CI 1.1-2.6). Among individuals with painful TMD, catastrophising was correlated to pain intensity (r=0.458, p<0.01) and functional limitations (r=0.294-0.321, p≤0.002), but not to number of pain sites.

CONCLUSION

Compared to controls, community-based individuals with painful TMD demonstrated higher levels of pain catastrophising, and this catastrophising was associated with increased pain intensity and jaw dysfunction. The relatively low scores of pain catastrophising suggest that even mild catastrophic thinking is associated with pain perception and jaw function, and should be considered in patient management.

Experimenter- and Infrared Thermography-Derived Measures of Capsaicin-Induced Neurogenic Flare Among Non-Hispanic White and Black Adults

OBJECTIVE

Capsaicin is a widely utilized experimental pain stimulus; however, few studies have reported on ethnic differences in pain responses to capsaicin. The present study used infrared thermography to 1) measure differences in capsaicin-induced neurogenic flare between non-Hispanic black (NHB) and non-Hispanic white (NHW) adults and 2) determine the association between neurogenic flare and secondary hyperalgesia.

METHODS

Fifty-four participants (NHB N = 28) underwent heat/capsaicin sensitization model procedures. Neurogenic flare was examined using experimenter (i.e., subjective) and thermography (i.e., objective) measurements. A typically nonpainful mechanical punctate probe was used to measure secondary hyperalgesia.

RESULTS

Ethnic groups did not significantly differ in age, sex, marital status, or personal income. Although experimenters rated a significantly wider area of capsaicin-related neurogenic flare among NHW compared with NHB participants (F1, 52 = 8.33, P = 0.006), thermography results showed no differences between groups in neurogenic flares (F1, 52 = 0.01, P = 0.93). Further, although NHB individuals reported greater average pain during the capsaicin procedures compared with NHW individuals (NHB = 58.57 [3.67], NHW = 46.46 [3.81]; F2, 51 = 5.19, P = 0.03), the groups did not differ in secondary hyperalgesia (F2, 51 = 0.03, P = 0.86), and ethnicity did not moderate the association between neurogenic flare and secondary hyperalgesia (F3, 50 = 0.24, P = 0.87).

CONCLUSIONS

Findings cautiously support the use of infrared thermography over subjective experimenter report when measuring neurogenic inflammation in diverse samples. However, infrared thermography should not be used as a diagnostic tool for pain, given the lack of association between these factors. Future research is warranted to replicate these findings in a larger and more diverse sample to determine accurate neurogenic inflammation measures across other ethnic minority populations.