Anger Inhibition and Pain Modulation

The variability in nociceptive flexion reflex threshold measurement is mostly caused by probabilistic effects of the estimation algorithms: a simulation study

OBJECTIVES

The nociceptive flexion reflex (NFR) and its threshold are frequently used to investigate spinal nociception in humans. Since this threshold (NFRT) is a probabilistic measure, specific algorithms are used for NFRT estimation based on the stochastic occurrence of reflexes at different stimulus intensities. We used a validated simulation model of the NFR to investigate the amount of NFRT measurement variability induced by different estimation algorithms in a steady setting of reduced external influences.

METHODS

We simulated the behavior of different estimation algorithms in subjects with an artificially steady baseline NFRT variability (standard deviation: 0 mA) or low baseline NFRT variability (standard deviation: 0.156 mA), equaling a quiet experimental setting. The obtained data were analyzed for NFRT measurement variability caused by the algorithms compared to the baseline variability reflecting other physiological influences.

RESULTS

The standard deviation of the NFRT estimated by the different algorithms ranged between 0.381 and 3.464 mA with 96.8% to 99.6% of the measurement variability attributed to the algorithm used. Out of the investigated algorithms the dynamic staircase algorithm was most precise.

CONCLUSION

The NFRT measurement variability observed during quiet and steady experimental sessions is mostly caused by the properties of the estimation algorithms, due to the probabilistic nature of the reflex occurrence. Our results give reference for choosing the optimal estimation algorithm to improve measurement precision.

Migraine Headaches: The Predictive Role of Anger and Emotional Intelligence

BACKGROUND

Research has shown that emotional intelligence and anger are significant predictors of both subjective and objective health. The present study aimed to draw a comparison between migraine patients and healthy individuals in terms of emotional intelligence and anger. In addition, there was an attempt to investigate the predictive role of emotional intelligence and anger in chronic migraine.

METHODS

This comparative study was carried out on 494 individuals including patients with chronic migraine (n=250) and healthy controls (n=244) in Shiraz between August 2019 and February 2020. The participants with chronic migraine and healthy controls were selected using convenience sampling and multistage sampling, respectively. Participants completed validated self-report questionnaires: Bradberry and Greaves emotional intelligence test and the provocation inventory. The data were analyzed using SPSS software (version 22.0) and chi-square test, t test and logistic regression were used. The significance level was set at P<0.05.

RESULTS

The results of independent t-test indicated that the mean intensity of anger was significantly higher among the patients with migraine (51.52±15.66) compared to the healthy controls (28.39±9.85) (P<0.001). The mean score of emotional intelligence was significantly lower among the patients with migraine (75.92±8.23) in comparison to the healthy controls (116.23±12.28) (P<0.001). Binary logistic regression revealed that neither age (P=0.72), sex (P=0.62), marital status (P=0.63) and education level (P=0.68), nor anger (P=0.24) was significantly associated with chronic migraine. However, emotional intelligence had a negative association with chronic migraine (B=-1.13, OR=0.32, P<0.001).

CONCLUSION

The results showed that a low level of emotional intelligence was associated with chronic migraine. The current results could help clinicians in planning for successful pain management/prevention programs.

An investigation of the effect of smartphone-based pain management application on pain intensity and the quality-of-life dimensions in adolescents with chronic pain: a cluster randomized parallel-controlled trial

INTRODUCTION

Chronic pain negatively affects adolescents' quality of life. Therefore, it is important to seek for ways to effectively manage pain, which may, in turn, promote quality-of-life dimensions in this population. However, there are many barriers including geographical distance which prevent most adolescents from receiving an effective treatment for chronic pain. The present study aimed to investigate the effect of a smartphone-based pain management application compared with face-to-face pain management program and wait-list control on the pain intensity and quality-of-life dimensions in adolescents with chronic pain.

METHODS

This study used a cluster double-blinded randomized parallel-group design with school as the unit of randomization. Participants included were 192 adolescents with chronic pain. The questionnaires (pain intensity and quality of life measuring physical, emotional, social, and school dimensions) were completed at the baseline, immediately at the end of pain management program and three months after the end of the program.

RESULTS

Repeated measures ANOVAs with adjustment for clustering effect showed that there were significant main effects of time on ratings of pain intensity (p < 0.01), physical (p < 0.005), emotional (p < 0.008), social (p < 0.001), and school (p < 0.005) dimensions of quality of life. There was also a significant main effect of group on ratings of emotional (p < 0.001), social (p < 0.009), and school (p < 0.002) dimensions. The interaction of group × time for emotional (p < 0.004), social (p < 0.001), and school (p < 0.005) dimensions of quality of life was statistically significant.

DISCUSSION

The findings suggest that smartphone-based pain management program, which is a highly accessible and cost-effective intervention, may provide benefits similar to a face-to-face intervention and shows promise for being effective on emotional, social, and school dimensions of quality of life in adolescents with different types of chronic pain. The study was registered within the Iranian Registry of Clinical Trials (IRCT20180808040744N2).

The effect of a smartphone-based pain management application on pain intensity and quality of life in adolescents with chronic pain

The development, implementation, and qualitative evaluation of smartphone-based pain management applications may provide an opportunity for more optimal management of pediatric pain in the homesetting. The present mixed-method study was conducted to assess a smartphone-based pain management application regarding the feasibility, adherence, participant satisfaction, and effectiveness on pain intensity and quality of life in adolescents with chronic pain. The study was carried out in the quantitative and qualitative stages using a mixed-method approach. The quantitative stage included 128 adolescents who met the ICD-11 criteria of chronic pain. After random allocation, adolescents allocated to the intervention group received a pain management program through a smartphone-based application. No education was given to the adolescents in the control group. The adolescents were assessed regarding pain intensity and different dimensions of quality of life at pre-intervention, post-intervention, and three-month follow-up. The findings in the quantitative stage were explained by qualitative interviews. The findings of the quantitative stage showed significant improvements in the pain intensity, emotional, social, and school functioning but not in the physical functioning of the adolescents. A high level of adherence (78.12%) and satisfaction (Mean = 26.45, SD = 6.45) with thes martphone-based pain management program was found. Based on the qualitative interviews, adolescents' pain management strategies can be classified in three main categories: physical management, psychological management, and interpersonal resources. The results confirm the positive effect of a smartphone-based pain management program on the pain intensity and different dimensions of quality of life of adolescents with chronic pain. Within the context of chronic pain management, a mobile application incorporating both the psychological and physical management of pain may help adolescents with chronic pain to reduce the negative impacts of pain on their life.

The transition from acute to persistent pain: the identification of distinct trajectories among women presenting to an emergency department

Posttraumatic stress disorder (PTSD) symptoms and other negative psychosocial factors have been implicated in the transition from acute to persistent pain. Women (N = 375) who presented to an inner-city emergency department (ED) with complaints of acute pain were followed up for 3 months. They completed a comprehensive battery of questionnaires at an initial visit and provided ratings of pain intensity at the site of pain presented in the ED during 3 monthly phone calls. Latent class growth analyses were used to detect possible trajectories of change in pain intensity from the initial visit to 3 months later. A 3-trajectory solution was found, which identified 3 groups of participants. One group (early recovery; n = 93) had recovered to virtually no pain by the initial visit, whereas a second group (delayed recovery; n = 120) recovered to no pain only after 1 month. A third group (no recovery; n = 162) still reported elevated pain at 3 months after the ED visit. The no recovery group reported significantly greater PTSD symptoms, anger, sleep disturbance, and lower social support at the initial visit than both the early recovery and delayed recovery groups. Results suggest that women with high levels of PTSD symptoms, anger, sleep disturbance, and low social support who experience an acute pain episode serious enough to prompt an ED visit may maintain elevated pain at this pain site for at least 3 months. Such an array of factors may place women at an increased risk of developing persistent pain following acute pain.

The effect of alexithymia and depressive feelings on pain perception in somatoform pain disorder

OBJECTIVE

To investigate the relationship between alexithymia and depression and their influence on the subjective versus experimental pain perception in somatoform pain disorder.

METHODS

Three groups consisting of 40 patients with somatoform pain disorder, 40 patients with depression, and 40 healthy controls were matched. They completed questionnaires regarding alexithymia (TAS26) and depressive feelings (BDI-II). In addition, pain patients rated their subjective pain intensity (NRS). Quantitative sensory testings were conducted in all participants examining temperature (CPT, HPT) and mechanical (MPT, PPT) thresholds.

RESULTS

Analysis of variance showed that alexithymia was significantly increased in both patient groups compared to healthy controls, but with the highest amount in somatoform pain. Regression analyses confirmed that this finding was in part due to a high comorbidity of depressive feelings in both patient groups. We found a discrepancy between increased clinical pain ratings and elevated pressure pain thresholds, indicating a less intense mechanical pain perception in somatoform pain. Correlation analyses demonstrated a significant connection of subjective pain ratings and pressure pain thresholds with depressive feelings.

CONCLUSION

Contrary to the results of other experimental pain studies on chronic muskuloskeletal pain syndromes, we could not confirm central sensitization in somatoform pain disorder. Our findings place the somatoform pain disorder more in the direction of affective disorder such as depression. These findings may improve a better understanding of the disease and also have direct therapeutic implications. The high occurrence of alexithymia and depressive feelings in somatoform pain should be considered in diagnostic and therapeutic regimens of these patients.