How to think about pain with the whole person in mind

Too often, pain is reduced to a simple symptom of illness or injury – a puzzle piece to fit into the differential diagnostic jigsaw. Pain reports that fit the emerging pathoanatomical picture are validated and treated accordingly. But many reports don’t fit this picture, and the widespread stigma associated with persistent pain is most commonly directed toward these individuals, whose symptoms aren’t well explained by known pain mechanisms. A root problem is not seeing the person in pain or the suffering they experience. This presentation aims to help participants develop a more comprehensive perspective on pain that better integrates its complexities within clinical practice. Participants will be introduced to the Multi-modal Assessment model of Pain (MAP; Wideman et al, Clinical Journal of Pain 2019; 35(3): 212). MAP offers a novel framework to understand the fundamentally subjective natures of pain and suffering and how they can be best addressed within clinical practice. MAP aims to help clinicians view pain, first and foremost, as an experience (like sadness), which may or may not correspond to specific pathology or diagnostic criteria (like clinical depression). MAP aims to facilitate a more compassionate approach to pain management by providing a rationale for why all reported pain should be validated, even when poorly understood. Viewing pain in this manner helps highlight the central importance of listening to patients’ narrative reports, trying to understand the meaning and context for their experiences of pain and using this understanding to help alleviate suffering.

Buprenorphine blood concentrations: A biomarker for analgesia

Opioids, the frontline drugs for postsurgical analgesia, have been linked to diversion and abuse with lethal consequences. The search for safe analgesics with less harm potential has been decades long. However, clinical trials for safe opioid and nonopioid analgesics have relied on subjective pain reports, which are biased by placebo effects that increase the complexity of trials to develop new therapies to manage pain.Research in opioid naïve animals and humans demonstrates that blood concentrations of opioids that effectively saturate the morphine opioid receptor are tightly linked with patient reports and quantitative sensory tests for analgesia. Opioid drug concentrations can predict clinical responses.This report reviews preclinical and clinical evidence correlating buprenorphine pharmacokinetics with analgesia. More than 30 years of data confirm buprenorphine blood concentrations can be an objective biomarker of analgesia for moderate to severe acute postoperative pain.

Effects of Pain-Reporting Education Program on Children's Pain Reports—Results From a Randomized Controlled Post-operative Pediatric Pain Trial

Objective: Accurate assessment of patients' pain is an essential part of adequate analgesic treatment. Although reporting pain is a complex task, limited-to-no instructions are provided to pediatric patients regarding this process. Our goal in this randomized parallel-group clinical trial (Clinicaltrial.gov study protocol number NCT04306679) was to evaluate if a training program designed to improve children's ability to understand and use pain scales in a post-surgical setting would affect their pain scores.Methods: Eligible children (aged 8–17), hospitalized for elective surgery and their parents were randomized into two groups. Pre-surgery the intervention group underwent a multi-media program aimed to teach and train how to report pain. The control group received standard pre-surgical instructions. Post-surgery, the children reported their pain on 4 pain scales. The primary outcome was the concordance between children's pain intensity scores reported on four pain scales, both in terms of within-child standard deviation and absolute difference.Results: Ninety-six children met inclusion criteria and completed the study. The trained subjects' pain reports had significantly (p = 0.002) lower within-subject standard deviation (0.41 ± 0.31) than the control group (0.67 ± 0.46). In line, regarding absolute difference, the concordance of children's pain reports was twice better in the trained group (mean difference of 0.43 ± 0.40) than in the control group (0.88 ± 0.70) (p < 0.001).Discussion: Our results suggests that children's ability to report pain is a skill that can be improved. Future studies should test the potential clinical impacts of educational interventions aimed to improve pain assessment in children and adults.

How and Why Patient Concerns Influence Pain Reporting: A Qualitative Analysis of Personal Accounts and Perceptions of Others’ Use of Numerical Pain Scales

Complex factors influence how people report and interpret numerical pain ratings. Such variability can introduce noise and systematic bias into clinical pain assessment. Identification of factors that influence self-rated pain and its interpretation by others may bolster utility of these scales. In this qualitative study, 338 participants described motivations for modulating their own pain reports relative to a numerical pain scale (0–10), as well as perceptions of others’ pain reporting modulation. Responses indicated that people over-report pain to enhance provider belief/responsiveness or the likelihood of pain relief, and out of fear of future pain or potential illness. Concerns of how one’s pain affects and is perceived by others, and financial concerns motivated pain under-reporting. Unprompted, many participants reported never modulating their pain ratings, citing trust in providers and personal ethics. Similar reasons were assumed to motivate others’ pain ratings. However, participants often attributed others’ over-reporting to internal causes, and their own to external. This bias may underlie common assumptions that patients over-report pain for nefarious reasons, distort interpretation of pain reports, and contribute to pain invalidation. Recognition of patient concerns and one’s own personal biases toward others’ pain reporting may improve patient-provider trust and support precision of numerical pain ratings.

Placebo Effects on Stress, but Not on Pain Reports. A Multi-Experiment Study

BackgroundContextual factors, such as participant/experimenter sex may moderate the placebo effects. We tested whether the participant and experimenter sex modulated placebo effects on experimentally induced pain and associated stress.ObjectiveTo investigate if (i) participant sex and (ii) experimenter sex influence placebo analgesia and subjective and physiological stress in two experiments employing a within-subjects and a mixed design, respectively. Placebo effects were investigated in pain reports, stress, and blood pressure.MethodsParticipants received painful stimulations and a placebo cream. In Experiment One (N = 59) participants underwent a placebo condition (PC) and a natural history condition (NHC) in random order. A placebo cream was applied in the PC and then the heat stimulation temperature was surreptitiously lowered. Identical stimulations were administered in the NHC, but with no cream, no information, and no lowered temperature. In Experiment Two, participants (N = 93) were randomly assigned to three groups receiving either a placebo cream with surreptitiously lowered intensity of electric stimuli (Placebo, PG), a placebo cream (Cream-Control, CCG) without changing the stimuli, or lowered intensity, but with no cream (Pain-Control, PCG) in a mixed design. All participants in both experiments received the same stimuli in the post-test as in the pre-test. Four experimenters (two females) in Experiment One, and five experimenters (two females) in Experiment Two conducted the studies.ResultsNo placebo effect was seen on pain. However, there were placebo effects on stress, moderated by participant and experimenter sex: in Experiment One males in the PC had lower diastolic blood pressure (DBP) compared to males in the NHC. Participants in the PC had lower DBP compared to the NHC when tested by a female. In Experiment Two, participants expected more cream effectiveness when a female experimenter administered it, and reported lower stress in the PG compared to the PCG when tested by females.ConclusionOur findings highlight a distinction between placebo effects on pain and on associated stress. Secondly, female experimenters recorded lower physiological and subjective stress, higher effectiveness expectations, and lower pain from both sexes compared to male experimenters. Possible reasons for the failure to find a pain placebo effect are discussed.

Effect sizes and test-retest reliability of the fMRI-based Neurologic Pain Signature

Identifying biomarkers that predict mental states with large effect sizes and high test-retest reliability is a growing priority for fMRI research. We examined a well-established multivariate brain measure that tracks pain induced by nociceptive input, the Neurologic Pain Signature (NPS). In N = 295 participants across eight studies, NPS responses showed a very large effect size in predicting within-person single-trial pain reports (d = 1.45) and medium effect size in predicting individual differences in pain reports (d = 0.49, average r = 0.20). The NPS showed excellent short-term (within-day) test-retest reliability (ICC = 0.84, with average 69.5 trials/person). Reliability scaled with the number of trials within-person, with ≥60 trials required for excellent test-retest reliability. Reliability was comparable in two additional studies across 5-day (N = 29, ICC = 0.74, 30 trials/person) and 1-month (N = 40, ICC = 0.46, 5 trials/person) test-retest intervals. The combination of strong within-person correlations and only modest between-person correlations between the NPS and pain reports indicates that the two measures have different sources of between-person variance. The NPS is not a surrogate for individual differences in pain reports, but can serve as a reliable measure of pain-related physiology and mechanistic target for interventions.

Can subjective pain be inferred from objective physiological data? Evidence from patients with sickle cell disease

Patients with sickle cell disease (SCD) experience lifelong struggles with both chronic and acute pain, often requiring medical interventMaion. Pain can be managed with medications, but dosages must balance the goal of pain mitigation against the risks of tolerance, addiction and other adverse effects. Setting appropriate dosages requires knowledge of a patient’s subjective pain, but collecting pain reports from patients can be difficult for clinicians and disruptive for patients, and is only possible when patients are awake and communicative. Here we investigate methods for estimating SCD patients’ pain levels indirectly using vital signs that are routinely collected and documented in medical records. Using machine learning, we develop both sequential and non-sequential probabilistic models that can be used to infer pain levels or changes in pain from sequences of these physiological measures. We demonstrate that these models outperform null models and that objective physiological data can be used to inform estimates for subjective pain.

“Big girls don’t cry”: the effect of the experimenter’s sex and pain catastrophising on pain

Objectives The expression of pain in males and females involves complex socio-psychological mechanisms. Males may report lower pain to a female experimenter to appear strong, whereas females may report higher pain to a male experimenter to appear weak and to seek protection. However, evidence to support these stereotypes is inconclusive. Individuals who catastrophise about pain rate higher pain than those who do not. How pain catastrophising interacts with the effect of the experimenter’s sex on pain reports is yet to be explored. Thus, the aim of this study was to determine whether pain catastrophising moderated the effect of the experimenter’s sex on pain reports in healthy males and females. Methods Participants (n=60, 30 males) were assigned to one of four experimental conditions: males tested by male experimenters, males tested by female experimenters, females tested by male experimenters, and females tested by female experimenters. Participants completed the Pain Catastrophising Scale, and then sensitivity to heat and to blunt (pressure-pain threshold) and sharp stimuli was assessed on both forearms, and to high frequency electrical stimulation (HFS) administered to one forearm. Results Females reported lower pressure-pain thresholds than males irrespective of the experimenters’ sex. Females reported lower sharpness ratings to male than female experimenters only when the test stimuli were moderately or intensely sharp. Higher pain catastrophising scores were associated with higher sharpness ratings in females but not males. Additionally, higher pain catastrophising scores were associated with greater temporal summation of pain to HFS, and with lower pressure-pain thresholds in females who were tested by male experimenters. Conclusions These findings indicate that the experimenters’ sex and the participant’s pain catastrophising score influence pain reports, particularly in females. Awareness of these psychosocial factors is important in order to interpret pain responses in a meaningful way, especially when females are tested by male experimenters. A greater awareness of sex/gender role biases and their potential interaction with pain catastrophising may help researchers and clinicians to interpret pain reports in meaningful ways. In turn, this may help to improve delivery of treatments for patients with chronic pain.

Why does your pain never get better? Stigma and coping mechanism in people with sickle cell disease

ABSTRACT Objectives: to analyze the characteristics of stigma in the interactions of people with pain and sickle cell disease and the coping strategies adopted. Methods: qualitative study, conducted in Bahia’s reference units between January and July 2018. In-depth interviews were applied to 25 adults, followed by content analysis and interpretation in light of the Sociological Theory of Stigma. Results: four categories emerged from the data: Stigma in interactions with family members; Stigma in interactions with people in the general public; Stigma in interactions with health workers; and Strategies for coping with stigma. Final Considerations: in the participants’ interactions, stigma produced discrediting pain reports, labeling and stereotyping, blaming patients for not improving their health, discrimination, racism, inadequate pain assessment, and delay in care. Coping included silencing, covering up, aggressive behavior, exposure to risk, reading religious texts and praises, and church attendance.

Pain Interference: A Barrier for Daily Living Activities in Older Adults with Multisite Musculoskeletal Pain

Almost half of older adults experience multisite musculoskeletal pain (MMP) contributing to difficulty in daily activities but little is known about specific domains by which pain interferes in daily living. This study aims to determine domains of pain interference (PI) related to MMP in a cohort of older adults living in the community. The MOBILIZE Boston Study (MBS) is a cohort study of 749 adults aged ≥70y. Musculoskeletal (MSK) pain was assessed using the joint pain questionnaire and grouped as: no pain, single site, and multisite pain. The Brief Pain Inventory PI sub-scale assessed level of interference (0-10 rating) in 7 categories in the previous week including general activity, mood, walking, work, relationships with people, sleep, and enjoyment of life. Interference items were grouped as: none (0 rating), mild (>0, ≤2), moderate ( ≥2, ≤5), and severe (≥5) PI. There was a strong gradient of PI according to pain groups with severe walking interference in 36.5% of those with MMP compared to 3.8% of those with no MSK pain. The least PI was in relationships with others (9.1% of MMP vs 1.1% of no MSK pain). Reports of interference in other domains were intermediate (20-26% of MMP vs 3-4% of no MSK pain). Women and those with Less education reported the most PI in every domain but no differences were observed by age. Greater attention to specific domains of pain interference such as walking could have substantial benefits for reducing the overall impact of MMP among older adults.