Pain interference and physical function demonstrate poor longitudinal association in people living with pain: a PROMIS investigation

Stanford Pragmatiec Effectiveness Comparison (SPEC) protocol: Comparing long-term effectiveness of high-frequency and burst spinal cord stimulation in real-world application

OBJECTIVES

High-frequency and burst stimulation are newer waveforms that have demonstrated promise compared to traditional tonic spinal cord stimulation (SCS), but more studies are needed to compare their effectiveness. We report the study methods for an ongoing, single center, pragmatic randomized clinical trial to compare the effectiveness of high-frequency and burst SCS in patients with chronic back and/or leg pain.

MATERIALS AND METHODS

Participants who are candidates for spinal cord stimulation are enrolled and screened. Participants will be randomly assigned using point-of-care randomization to receive either high-frequency or burst SCS. Data collection will be through Stanford Pain Management Center's learning healthcare system: CHOIR. CHOIR surveys include National Institutes of Health Patient Reported Outcomes Measurement Information System item banks, a body map, questions about pain intensity, pain catastrophizing scale, and questions about patients' pain experience and healthcare utilization. Participants will complete online surveys at baseline and then 1, 3, 6, 12, 18, 24 and 36 months after their device implant. All participants will use our routine process of trial and implant. Reported adverse events are monitored throughout the study. Our primary outcome is change from baseline in pain intensity at 12 months.

RESULTS

We hypothesize that high-frequency SCS is more effective than burst SCS in improving pain, physical function and pain interference in participants with chronic low back and/or leg pain.

CONCLUSIONS

The pragmatic nature of our proposed trial enables us to recruit a larger participant cohort faster and to follow up these participants longer than currently published clinical trials.

A Paradigm Shift for Movement-based Pain Assessment in Older Adults: Practice, Policy and Regulatory Drivers

BACKGROUND

The profession of nursing has been on the front line of pain assessment and management in older adults for several decades. Self-report has traditionally been the most reliable pain assessment method, and it remains a priority best practice in identifying the presence and intensity of pain. Although advances in technology, biomarkers, and facial cue recognition now complement self-report, it is still important to maximize self-report of pain and to gather understanding of the total pain experience directly from patients. Practices in pain assessment in older adults have evolved over the past 25 years, and current research and quality improvement studies seek not only to detect the presence of pain, but also to determine the best protocol for assessment and most important pain characteristics to assess. Increasing data are now supporting two emerging practices: (1) consistently assessing the impact of pain on function, and (2) measuring pain during movement-based activities rather than at rest.

OBJECTIVE

The purpose of this article is thus to discuss the shifting paradigm for movement-based pain assessment in older adults, as well as the practice, policy, and regulatory drivers that support this practice change.

Development and validation of the Collaborative Health Outcomes Information Registry body map

Supplemental Digital Content is Available in the Text.

Introduction:

Critical for the diagnosis and treatment of chronic pain is the anatomical distribution of pain. Several body maps allow patients to indicate pain areas on paper; however, each has its limitations.

Objectives:

To provide a comprehensive body map that can be universally applied across pain conditions, we developed the electronic Collaborative Health Outcomes Information Registry (CHOIR) self-report body map by performing an environmental scan and assessing existing body maps.

Methods:

After initial validation using a Delphi technique, we compared (1) pain location questionnaire responses of 530 participants with chronic pain with (2) their pain endorsements on the CHOIR body map (CBM) graphic. A subset of participants (n = 278) repeated the survey 1 week later to assess test–retest reliability. Finally, we interviewed a patient cohort from a tertiary pain management clinic (n = 28) to identify reasons for endorsement discordances.

Results:

The intraclass correlation coefficient between the total number of body areas endorsed on the survey and those from the body map was 0.86 and improved to 0.93 at follow-up. The intraclass correlation coefficient of the 2 body map graphics separated by 1 week was 0.93. Further examination demonstrated high consistency between the questionnaire and CBM graphic (<10% discordance) in most body areas except for the back and shoulders (≈15–19% discordance). Participants attributed inconsistencies to misinterpretation of body regions and laterality, the latter of which was addressed by modifying the instructions.

Conclusions:

Our data suggest that the CBM is a valid and reliable instrument for assessing the distribution of pain.

Preoperative risk factors associated with chronic pain profiles following total knee arthroplasty

Background

One in five patients experience chronic pain 12 months following total knee arthroplasty (TKA). This longitudinal study used a person‐centred approach to identify subgroups of patients with distinct chronic pain profiles following TKA and identified preoperative characteristics associated with these profiles.

Methods

On the day before surgery, 202 patients completed questionnaires that assessed pain, interference with functioning, fatigue, anxiety, depression and illness perceptions. Average and worst pain were assessed prior to surgery, on postoperative day 4, at 6 week and at 3 and 12 months following surgery. Using growth mixture modelling, two subgroups with distinct average and worst pain profiles were identified.

Results

Patients in the “lower average” and “lower worst” pain classes had moderate preoperative pain scores that decreased over the remaining 9 months following TKA. Patients in the “higher average” and “higher worst” pain classes had relatively higher preoperative pain scores that increased during the first three months and then decreased slightly over the remaining 9 months. Patients in the higher pain classes had higher interference with function scores; used opioids prior to surgery more often, were more likely to receive a continuous nerve block and ketamine; had higher preoperative fatigue severity and interference scores; and had worse perceptions of illness than patients in the lower pain classes.

Conclusions

These risk factors may be used to identify subgroups of patients at higher risk for more severe pain after TKA. Future studies should test whether modifying these risk factors can improve patients’ outcomes after TKA.

Significance statement

The present study provides a novel and original analysis of pain profiles following total knee arthroplasty that may contribute to our understanding of the transition from acute to chronic pain. Our results may be used to identify patients at higher risk for poorer outcomes based on preoperative risk factors.

Baseline Characteristics of a Dyadic Cohort of Mothers With Chronic Pain and Their Children

OBJECTIVES

A growing body of research has demonstrated a robust link between parental chronic pain and child pain and psychological function. Although the association between parent and child pain is strong, there are limited data to understand environmental and behavioral processes that account for the association and how this develops over time. This longitudinal cohort study was designed to understand the potential mechanisms that confer risk or resilience for chronic pain among child offspring of mothers with chronic pain.

METHODS

The current paper presents baseline data on the cohort to describe the pain and psychosocial characteristics of mothers with chronic pain and their 8- to 12-year-old children. A total of 400 mothers with chronic pain and their children were enrolled into the longitudinal study and completed measures of pain, physical, and psychosocial functioning.

RESULTS

Mothers reported a range of pain and pain-related disability and were grouped into 4 pain grades (PGs) representing different pain and disability levels. Mothers in these groups differed on rates of widespread pain and opioid use. Maternal PGs also differed by physical function, fatigue, sleep disturbance, and psychological function. Most children in this sample reported pain and psychosocial symptoms in the nonclinical range, and child variables did not differ by maternal PG. Maternal disability and function were concurrently associated with child psychosocial function.

DISCUSSION

While maternal PGs map broadly onto several dimensions of maternal functioning, they were not significantly related to child pain or function. Results may help identify potential protective factors in the intergenerational transmission of risk for chronic pain.

The Impact of Social Isolation on Pain Interference: A Longitudinal Study

Background

Evidence suggests social interactions play an important role in pain perception.

Purpose

The aim of this study was to determine whether social isolation (SI) in people with persistent pain determines pain interference (PI) and physical function over time.

Methods

Patients seeking care at a tertiary pain management referral center were administered the Patient Reported Outcome Measurement Information System (PROMIS^®) SI, PI, physical function, depression, and average pain intensity item banks at their initial consultation and subsequent visits as part of their routine clinical care. We used a post hoc simulation of an experiment using propensity score matching (n = 4,950) and carried out a cross-lagged longitudinal analysis (n = 312) of retrospective observational data.

Results

Cross-lagged longitudinal analysis showed that SI predicted PI at the next time point, above and beyond the effects of pain intensity and covariates, but not vice versa.

Conclusions

These data support the importance of SI as a factor in pain-related appraisal and coping and demonstrate that a comprehensive assessment of the individuals’ social context can provide a better understanding of the differential trajectories for a person living with pain. Our study provides evidence that the impact of pain is reduced in individuals who perceive a greater sense of inclusion from and engagement with others. This study enhances the understanding of how social factors affect pain and have implications for how the effectiveness of therapeutic interventions may be improved. Therapeutic interventions aimed at increasing social connection hold merit in reducing the impact of pain on engagement with activities.

Frailty modifies the intervention effect of chair yoga on pain among older adults with lower extremity osteoarthritis: Secondary analysis of a nonpharmacological intervention trial

OBJECTIVE

In an 8-week nonpharmacological pain intervention trial among older adults with lower extremity osteoarthritis (OA), we aimed to examine: a) the baseline frailty level of the participants; b) whether such intervention is more beneficial for baseline frailer older adults than for their counterparts with less frailty; and c) whether the intervention could also alter frailty.

METHODS

Participants were randomly assigned to either chair yoga (CY) or health education program (HEP) groups and attended twice-weekly 45-minute CY or HEP sessions for 8 weeks. Following a standard procedure, 82 variables were used to construct a frailty index (FI, 0-1). Primary outcomes were: Western Ontario and McMaster Universities (WOMAC) pain and pain interference. Linear mixed-effects models were used to evaluate the modifying effect of baseline frailty on the intervention effect of CY on primary outcomes. Similar models were used to evaluate the effect of CY on frailty.

RESULTS

A total of 112 participants (n = 63 CY, n = 49 HEP; 75.3 [SD = 7.5] years) with 85 females (75.9%) were included. The mean values of baseline FI for the CY and HEP groups were similar (0.428 [0.05] and 0.433 [0.05], P = 0.355). Each 0.01 increment in baseline FI was associated with higher WOMAC pain (beta = 0.28, P < 0.001) and pain interference (beta = 0.51, P < 0.001). There was a significant interaction effect between intervention, time, and baseline FI (P = 0.020 for WOMAC pain; P = 0.010 for pain interference), indicating that participants with higher level of baseline FI had greater declines in WOMAC pain and pain interference. There was no significantly greater decline in FI for the CY group compared to the HEP group (between-group difference - 0.01; P = 0.509) and there were no significant trend changes in FI (P for interaction = 0.605).

CONCLUSIONS

Frailty modifies the intervention effect of CY on pain among older adults with lower extremity OA, underscoring the importance of assessing frailty to improve the management of pain in this population.

End points for sickle cell disease clinical trials: patient-reported outcomes, pain, and the brain

To address the global burden of sickle cell disease (SCD) and the need for novel therapies, the American Society of Hematology partnered with the US Food and Drug Administration to engage the work of 7 panels of clinicians, investigators, and patients to develop consensus recommendations for clinical trial end points. The panels conducted their work through literature reviews, assessment of available evidence, and expert judgment focusing on end points related to: patient-reported outcomes (PROs), pain (non-PROs), the brain, end-organ considerations, biomarkers, measurement of cure, and low-resource settings. This article presents the findings and recommendations of the PROs, pain, and brain panels, as well as relevant findings and recommendations from the biomarkers panel. The panels identify end points, where there were supporting data, to use in clinical trials of SCD. In addition, the panels discuss where further research is needed to support the development and validation of additional clinical trial end points.

Patient Characteristics, Treatment, and Presenting PROMIS Scores Associated with Number of Office Visits for Traumatic Hand and Wrist Conditions

BACKGROUND

Overuse of healthcare resources is burdensome on society. Prior research has demonstrated that many patients with traumatic musculoskeletal injuries continue to seek care long after appropriate healing is well established, suggesting an overuse of services. However, few studies have examined the factors-including patient-reported outcomes-associated with an increased number of clinic visits for traumatic hand and wrist conditions.

QUESTIONS/PURPOSES

(1) After accounting for surgical treatment, surgeon, and demographic factors, is a patient's PROMIS Pain Interference score associated with the total number of office visits? (2) Is PROMIS Depression, combination of PROMIS Depression and Pain Interference, or Physical Function scores associated with the number of office visits?

METHODS

Between June 2015 and May 2018, 1098 patients presenting for a new patient visit at a single, urban academic medical center for distal radius fracture, wrist or hand sprain, tendon rupture, traumatic finger amputation, or scaphoid fracture were identified. Of those, 823 (75%) patients completed all PROMIS domains and presented before the trailing period and thus were included in this retrospective study. We recorded a number of variables including: Total number of office visits, age, sex, race, marital status, diagnosis, provider, and operative or nonoperative treatment. Multivariable Poisson regression analysis was conducted to determine whether Patient-Reported Outcomes Measurement Information System Pain Interference (PROMIS PI), Physical Function (PROMIS PF), and Depression scores measured at the first visit were associated with the total number of office visits, after accounting for the other factors we measured.

RESULTS

Higher PROMIS PI scores were associated with greater number of clinic visits (0.0077; 95% CI, 0.0018-0.014; p = 0.010). Although PROMIS Depression scores were not associated with the number of office visits (0.0042; 95% CI, -0.0099 to 0.0094; p = 0.112), higher PROMIS PF scores were associated with fewer office visits when accounting for confounding variables (-0.0077; 95% CI, -0.0012 to -0.0029; p = 0.001). Additionally, across all individual PROMIS models, there was an association between the variables "operative treatment" (PI: 0.85; 95% CI, 0.72-0.98; p < 0.001; Depression: 0.87; 95% CI, 0.74-1.0; p < 0.001; PF: 0.85; 95% CI, 0.72-0.99; p < 0.001) and "traumatic finger amputation" (PI: 0.22; 95% CI, 0.016-0.42; p = 0.034; Depression: 0.2; 95% CI, 0.086-0.47; p = 0.005; PF: 0.21; 95% CI, 0.014-0.41; p = 0.036) with an increased total number of office visits. Provider team 5 (PI: -0.62; 95% CI, -0.98 to -0.27; p = 0.001; Depression: -0.61; 95% CI, -0.96 to -0.26; p = 0.001; PF: -0.60; 95% CI, -0.96 to -0.25; p = 0.001) was associated with fewer office visits. In both the PROMIS Depression and PROMIS PF regression models, increasing age (Depression: -0.0048; 95% CI, -0.0088 to -0.00081; p = 0.018; PF: -0.0045; 95% CI, -0.0085 to -0.0006; p = 0.024) was also associated with fewer total number of office visits.

CONCLUSIONS

This study helps surgeons understand that patients who present at their initial office visit for traumatic hand and wrist conditions displaying worse pain coping strategies and decreased physical function will have more office visits. We recommend that surgeons engage in a comprehensive care approach that is empathetic, fosters effective pain coping strategies (and so might decrease PROMIS PI scores), and educates patients about expectations by providing educational materials and/or including other health professionals (such as, social work, physical therapy, mental health professional) as needed. This may decrease healthcare use in patients with traumatic hand and wrist conditions.

LEVEL OF EVIDENCE

Level IV, prognostic study.

Frailty is associated with pain and cognitive function in older people in post-acute care settings

BACKGROUND

To describe pain, cognitive function, and frailty of older people in post-acute care settings and examine the association between the three elements.

METHODS

This cross-sectional study involved 142 participants from a rehabilitation ward and a geriatric day centre. Pain, cognitive function and frailty were assessed using Brief Pain Inventory, Abbreviated Mental Test, and 5-item Frail Scale respectively.

RESULTS

Participants were mostly women (51.7%) with a mean age of 76.5 (SD 7.8). Mean scores for pain, cognition, and frailty were 9.0 ± 1.0, 4.0 ± 2.8, and 2.2 ± 1.2, respectively. Cognition had a significant inverse association with frailty (β = -0.160, p = 0.047), and pain had a significant positive association with frailty (β = 5.122, p < 0.001). This linear regression model explained a variance of 0.269.

CONCLUSIONS

The study demonstrated the association between pain, cognitive function, and frailty. In predicting frailty, however, more studies are required to determine the predictive value and cut-off points for pain and cognitive measures.

Utility of the PROMIS Pediatric Pain Interference Scale in Juvenile Fibromyalgia

OBJECTIVE

The current study tested the utility of the PROMIS Pediatric Pain Interference (PPI) in relation to the widely-used Functional Disability Inventory (FDI) in a small-scale clinical trial.

METHODS

Forty youth with juvenile fibromyalgia (JFM) were randomized to either CBT only or a combined CBT and neuromuscular exercise group (i.e., FIT Teens). Participants completed the PPI and FDI at baseline, post-treatment, and three-month follow-up.

RESULTS

The PPI and FDI were significantly correlated at baseline (r = .51) and post treatment (r = .53), and demonstrated similar improvements (d PPI = .87, d FDI = 1.22, p < .05) at post-treatment following FIT Teens. Following CBT only, neither the PPI nor the FDI improved significantly.

CONCLUSIONS

The PPI may be appropriate for use in non-pharmacologic interventions for pediatric pain.

Benefits of the Restorative Exercise and Strength Training for Operational Resilience and Excellence Yoga Program for Chronic Low Back Pain in Service Members: A Pilot Randomized Controlled Trial

OBJECTIVE

To examine the feasibility and preliminary effectiveness of an individualized yoga program.

DESIGN

Pilot randomized controlled trial.

SETTING

Military medical center.

PARTICIPANTS

Patients (N=68) with chronic low back pain.

INTERVENTIONS

Restorative Exercise and Strength Training for Operational Resilience and Excellence (RESTORE) program (9-12 individual yoga sessions) or treatment as usual (control) for an 8-week period.

MAIN OUTCOME MEASURES

The primary outcome was past 24-hour pain (Defense & Veterans Pain Rating Scale 2.0). Secondary outcomes included disability (Roland-Morris Disability Questionnaire) and physical functioning and symptom burden (Patient-Reported Outcomes Measurement Information System-29 subscales). Assessment occurred at baseline, week 4, week 8, 3-month follow-up, and 6-month follow-up. Exploratory outcomes included the proportion of participants in each group reporting clinically meaningful changes at 3- and 6-month follow-ups.

RESULTS

Generalized linear mixed models with sequential Bonferroni-adjusted pairwise significance tests and chi-square analyses examined longitudinal outcomes. Secondary outcome significance tests were Bonferroni adjusted for multiple outcomes. The RESTORE group reported improved pain compared with the control group. Secondary outcomes did not retain significance after Bonferroni adjustments for multiple outcomes, although a higher proportion of RESTORE participants reported clinically meaningfully changes in all outcomes at 3-month follow-up and in symptom burden at 6-month follow-up.

CONCLUSIONS

RESTORE may be a viable nonpharmacological treatment for low back pain with minimal side effects, and research efforts are needed to compare the effectiveness of RESTORE delivery formats (eg, group vs individual) with that of other treatment modalities.

Behavioral inhibition, maladaptive pain cognitions, and function in patients with chronic pain

BACKGROUND AND AIMS

Trait behavioral inhibition represents a tendency to react with negative emotions - primarily worry - to cues which signal potential threats. This tendency has been hypothesized by a two-factor model of chronic pain to have direct effects on psychological and physical function in individuals with chronic pain, as well as to influence the associations between pain-related maladaptive cognitions and function. Our aim was to test these hypothesized associations in a sample of individuals who were being screened for possible interdisciplinary chronic pain treatment.

METHODS

Eighty-eight patients referred to an interdisciplinary chronic pain management program were administered measures of average pain intensity, trait behavioral inhibition, kinesiophobia, pain catastrophizing, depressive symptoms, and pain interference. We then performed two linear regression analyses to evaluate the direct effects of trait behavioral inhibition on depressive symptoms and pain interference and the extent to which behavioral inhibition moderated the associations between kinesiophobia and pain catastrophizing, and the criterion variables.

RESULTS

In partial support of the study hypotheses, the results showed significant (and independent) direct effects of trait behavioral inhibition on depressive symptoms, and behavioral inhibition moderated the association between kinesiophobia and depression, such that there were stronger associations between kinesiophobia and depressive symptoms in those with higher dispositional sensitivity to fear-inducing stimuli. However, neither direct nor moderating effects of behavioral inhibition emerged in the prediction of pain interference.

CONCLUSIONS

If replicated in additional studies, the findings would indicate that chronic pain treatments which target both reductions in maladaptive cognitions (to decrease the direct negative effects of these on depressive symptoms) and the individual's tendency to respond to pain with worry (as a way to buffer the potential effects of maladaptive cognitions on depressive symptoms) might be more effective than treatments that targeted only one of these factors.

IMPLICATIONS

Additional research is needed to further evaluate the direct and moderating effects of pain-related behavioral inhibition on function, as well as the extent to which treatments which target behavioral inhibition responses provide benefits to individuals with chronic pain.