The Journal of Pain

Time Series Analysis of California’s Prescription Monitoring Program: Impact on Prescribing and Multiple Provider Episodes

2011-11-24

Abstract: Prescription monitoring programs (PMPs) are designed to reduce medication diversion by identifying individuals obtaining the same medication from multiple providers (termed multiple provider episodes [MPEs]). This study determined whether recent changes to California’s PMP influenced: 1) the extent that practitioners issue prescriptions for a variety of Schedule II opioids; and 2) the incidence of MPEs involving these opioids. Intervention time series of California’s PMP data was used to determine the effect of requiring practitioners to transition from using triplicate prescription forms for Schedule II medications to security forms for all controlled substances. Outcome measures included changes in number of prescriptions issued for Schedule II long-acting or short-acting (SA) opioids and the MPEs involving these medications. Requiring a security form was associated with a sustained prescribing increase for SA hydromorphone, meperidine, and SA oxycodone; no prescribing changes were found for SA fentanyl, methadone, and SA morphine, or for any long-acting opioids. The same policy change, however, increased MPEs involving all opioids. Further effort is required to determine how California’s PMP can continue to ensure availability of prescription opioids for medical use while better mitigating their diversion.Perspective: Statistical model-building was used to evaluate the influence of changes to California’s prescription monitoring program. The extent that practitioners prescribe Schedule II opioids and the incidence of people receiving prescriptions from multiple providers were measured. Such research illustrates the viability of evaluating drug control program impact on prescribing practice and potential diversion behaviors.

A Pilot Study of the Tolerability and Effects of High-Definition Transcranial Direct Current Stimulation (HD-tDCS) on Pain Perception

2011-11-21

Abstract: Several brain stimulation technologies are beginning to evidence promise as pain treatments. However, traditional versions of 1 specific technique, transcranial direct current stimulation (tDCS), stimulate broad regions of cortex with poor spatial precision. A new tDCS design, called high definition tDCS (HD-tDCS), allows for focal delivery of the charge to discrete regions of the cortex. We sought to preliminarily test the safety and tolerability of the HD-tDCS technique as well as to evaluate whether HD-tDCS over the motor cortex would decrease pain and sensory experience. Twenty-four healthy adult volunteers underwent quantitative sensory testing before and after 20 minutes of real (n = 13) or sham (n = 11) 2 mA HD-tDCS over the motor cortex. No adverse events occurred and no side effects were reported. Real HD-tDCS was associated with significantly decreased heat and cold sensory thresholds, decreased thermal wind-up pain, and a marginal analgesic effect for cold pain thresholds. No significant effects were observed for mechanical pain thresholds or heat pain thresholds. HD-tDCS appears well tolerated, and produced changes in underlying cortex that are associated with changes in pain perception. Future studies are warranted to investigate HD-tDCS in other applications, and to examine further its potential to affect pain perception.Perspective: This article presents preliminary tolerability and efficacy data for a new focal brain stimulation technique called high definition transcranial direct current stimulation. This technique may have applications in the management of pain.

Physical Activity and Function in Adolescents With Chronic Pain: A Controlled Study Using Actigraphy

Anna C. Wilson, Tonya M. Palermo — 2011-11-18

Abstract: Physical functioning is often impaired in adolescents with chronic pain, which has largely been demonstrated through subjective self-report measures. Actigraphy uses motion monitoring as an objective means for assessing one dimension of physical functioning; physical activity level. This study used subjective and objective measures to assess multiple dimensions of physical functioning in a clinical sample of adolescents with chronic pain (n = 78) and a comparison group of healthy adolescents (n = 59). Individual and pain characteristics were also examined as predictors of actigraphy variables within the chronic pain sample. Results indicated that adolescents with chronic pain demonstrate significant impairment in subjective measures of physical functioning and evidence lower levels of physical activity. Actigraphic measures of physical activity were moderately correlated with self-report measures of physical functioning. Individual characteristics, including adolescent age, sex, and Body Mass Index percentile, were associated with physical activity levels among adolescents with chronic pain. Physical activity represents a distinct dimension of physical functioning. Assessing physical activity may provide additional description of physical functioning among adolescents with chronic pain, and may help identify targets for intervention in this population.Perspective: This study demonstrates that adolescents with chronic pain have lower physical activity levels, as measured objectively via actigraphy, as well as poorer subjective reports of physical functioning, compared to healthy adolescents. Actigraphic measurement of physical activity provides objective source data about one dimension of physical functioning.

The Interruptive Effect of Pain in a Multitask Environment: An Experimental Investigation

2011-11-10

Abstract: Daily life is characterized by the need to stop, start, repeat, and switch between multiple tasks. Here, we experimentally investigate the effects of pain, and its anticipation, in a multitask environment. Using a task-switching paradigm, participants repeated and switched between 3 tasks, of which 1 predicted the possible occurrence of pain. Half of the participants received low intensity pain (N = 30), and half high intensity pain (N = 30). Results showed that pain interferes with the performance of a simultaneous task, independent of the pain intensity. Furthermore, pain interferes with the performance on a subsequent task. These effects are stronger with high intensity pain than with low intensity pain. Finally, and of particular importance in this study, interference of pain on a subsequent task was larger when participants switched to another task than when participants repeated the same task.Perspective: This article is concerned with the interruptive effect of pain on people’s task performance by using an adapted task-switching paradigm. This adapted paradigm may offer unique possibilities to investigate how pain interferes with task performance while people repeat and switch between multiple tasks in a multitask environment.

The Economic Cost of Chronic Noncancer Pain in Ireland: Results From the PRIME Study, Part 2

2012-02-01

Abstract: To assess the economic cost of chronic pain in Ireland, information was gathered from 140 people with chronic pain. Direct and indirect costs attributable to chronic pain and medical conditions of which chronic pain was a feature were recorded retrospectively for 12 months. Mean cost per chronic pain patient was estimated at €5,665 per year across all grades of pain, with mean costs increasing according to the severity of pain. A small proportion of patients account for the bulk of costs—the top 5% most expensive patients accounted for 26.4% of costs, with a mean cost per patient of €29,936, and the 10% most expensive patients were responsible for 42.8% of all costs. Total cost for individuals aged 20 and above was estimated at €5.34 billion per year, or 2.86% of Irish GDP in 2008. Those with clinically elevated depression scores had costs that were twice as high as people who scored below the depression cut-off score. Chronic pain services in Ireland are generally underresourced. Improved coordination and better management of patients via interdisciplinary pain rehabilitation program is essential and may offer a means of reducing the sizeable economic burden of chronic pain.Perspective: The cost of chronic pain per patient was €5,665 per year extrapolated to €5.34 billion or 2.86% of GDP per year. Those with clinically significant depression had costs twice as high as those without depression. The significant burden of chronic pain highlights the need for cost effective interventions to reduce long-term disability.

Craving of Prescription Opioids in Patients With Chronic Pain: A Longitudinal Outcomes Trial

2012-01-16

Abstract: Little is known about whether patients with chronic pain treated with opioids experience craving for their medications, whether contextual cues may influence craving, or if there is a relationship between craving and medication compliance. We hypothesized that craving for prescription opioids would be significantly correlated with the urge for more medication, preoccupation with the next dose, and current mood symptoms. We studied craving in 62 patients with chronic pain who were at low or high risk for opioid misuse, while they were enrolled in an RCT to improve prescription opioid medication compliance. Using electronic diaries, patients completed ratings of craving at monthly clinic visits and daily during a 14-day take-home period. Both groups consistently endorsed craving, whose levels were highly correlated (P < .001) with urge, preoccupation, and mood. The intervention to improve opioid compliance in the high-risk group was significantly associated with a rate of decrease in craving over time in comparison to a high-risk control group (P < .05). These findings indicate that craving is a potentially important psychological construct in pain patients prescribed opioids, regardless of their level of risk to misuse opioids. Targeting craving may be an important intervention to decrease misuse and improve prescription opioid compliance.Perspective: Patients with noncancer pain can crave their prescription opioids, regardless of their risk for opioid misuse. We found craving to be highly correlated with the urge to take more medication, fluctuations in mood, and preoccupation with the next dose, and to diminish with a behavioral intervention to improve opioid compliance.

Repetitive Treatment With Diluted Bee Venom Reduces Neuropathic Pain Via Potentiation of Locus Coeruleus Noradrenergic Neuronal Activity and Modulation of Spinal NR1 Phosphorylation in Rats

2012-01-05

Abstract: We previously demonstrated that a single injection of diluted bee venom (DBV) temporarily alleviates thermal hyperalgesia, but not mechanical allodynia, in neuropathic rats. The present study was designed to determine whether repetitive injection of DBV produces more potent analgesic effects on neuropathy-induced nociception and whether those effects are associated with increased neuronal activity in the locus coeruleus (LC) and with the suppression of spinal NMDA receptor NR1 subunit phosphorylation (pNR1). DBV (.25 mg/kg) was administered subcutaneously twice a day for 2 weeks beginning on day 15 post-chronic constrictive injury surgery. Pain responses were examined and potential changes in LC Fos expression and spinal pNR1 expression were determined. Repetitive DBV administration significantly reduced mechanical allodynia, as well as thermal hyperalgesia. The activity of LC noradrenergic neurons was increased and spinal pNR1 expression was significantly suppressed by repetitive DBV as compared with those of vehicle or single DBV injection. These suppressive effects of repetitive DBV on neuropathic pain and spinal pNR1 were prevented by intrathecal pretreatment of idazoxan, an alpha-2 adrenoceptor antagonist. These results indicate that repetitive DBV produces potent analgesic effects on neuropathic pain and this is associated with the activation of the LC noradrenergic system and with a reduction in spinal pNR1.Perspective: The results of current study demonstrate that repetitive administration of DBV significantly suppresses neuropathic pain. Furthermore, this study provides mechanistic information that repetitive treatment of DBV can produce more potent analgesic effect than single DBV treatment, indicating a potential novel strategy for the management of chronic pain.

How Do I Empathize With You? Let Me Count the Ways: Relations Between Facets of Pain-Related Empathy

Jaclyn B. Issner, Annmarie Cano, Michelle T. Leonard, Amy M. Williams — 2012-01-09

Abstract: This study examined the extent to which components of empathy (ie, empathic accuracy, empathic tendencies, and empathic responses) were correlated within the context of chronic pain couples. Additionally, the interrelationships between these empathy variables and spouse responses to pain were investigated. Participants were 57 couples in which at least 1 spouse reported chronic musculoskeletal pain. Each couple participated in a videotaped interaction about the impact of pain in their lives together, after which they completed an empathic accuracy procedure. The interactions were coded for the spouse’s use of empathic responses. Couples also completed surveys about pain severity, pain interference, empathic tendencies, marital satisfaction, and perceived spousal responses (ie, solicitous and punishing responses) to pain. Spousal empathic responses and empathic accuracy were not related to one another nor were they related to spousal empathic tendencies, or solicitous spouse responses. Spousal punishing responses were negatively related to empathic responses. The association between solicitousness and empathic responses was moderated by spousal marital satisfaction. The findings suggest that there are not clear associations among these empathy variables. The results also indicate that the climate in which solicitousness is provided may influence the extent to which spouses display empathic responses.Perspective: The findings have implications for models of pain empathy and suggest that future research is needed to understand relations between aspects of empathy. Moreover, interventions aimed at addressing the empathic climate in which support is delivered may help spouses more empathically and effectively communicate with and assist partners with pain management.

The Association Between Race and Neighborhood Socioeconomic Status in Younger Black and White Adults With Chronic Pain

Carmen R. Green, Tamera Hart-Johnson — 2012-01-16

Abstract: Both race and socioeconomic status (SES) contribute to disparities. We assessed the relative roles of neighborhood socioeconomic status (nSES) and race in the chronic pain experience for young adults (<50 years old). Data from a tertiary care pain center was matched to 2000 US Census data to examine the role of race and nSES on chronic pain and its sequelae in 3,730 adults (9.7% black, 61% female) 18 to 49 years old (37 ± 8 years). Blacks had significantly more pain and disability and lived in lower SES neighborhoods. Living in a lower SES neighborhood was associated with increased sensory, affective, and “other” pain, pain-related disability, and mood disorders. Race was independently associated with affective and “other” pain on the McGill Pain Questionnaire scales, and both disability factors. Racial disparities in sensory pain and mood disorders were mediated by nSES. In every case, race and neighborhood SES played important roles in the outcomes for chronic pain. Age was related to both disability outcomes. Gender was associated with voluntary disability and mood disorders, with men displaying worse outcomes.Perspective: Important racial- and SES-related variability in pain related outcomes in young adults with chronic pain were defined. Black race was associated with neighborhood SES, and black race plays an important role in pain outcomes beyond neighborhood SES.

Muscle Pain Differentially Modulates Short Interval Intracortical Inhibition and Intracortical Facilitation in Primary Motor Cortex

Siobhan M. Schabrun, Paul W. Hodges — 2012-01-09

Abstract: Excitability of the motor cortex can be suppressed during muscle pain. Yet the mechanisms are largely unknown. Short interval intracortical inhibition (SICI) and intracortical facilitation (ICF) were examined as possible candidate mechanisms to underpin this change. SICI and ICF were investigated in 11 healthy individuals before, during and after infusion of hypertonic saline into right first dorsal interosseous (FDI). Using paired-pulse transcranial magnetic stimulation (TMS), interstimulus intervals of 2, 3, and 13 ms were investigated. Pain intensity and quality were recorded using a 10-cm visual analogue scale and the McGill Pain Questionnaire. Resting motor threshold and motor-evoked potentials (MEPs) to single TMS stimuli were recorded before and after pain. Electromyographic recordings were made from right FDI and abductor digiti minimi. Participants reported an average pain intensity of 5.8 (1.6) cm. MEP amplitudes decreased in both muscles. Compared with the pre-pain condition, SICI was increased following pain, but not during. ICF was decreased both during and after pain when compared with the pre-pain condition. These findings suggest that muscle pain differentially modulates SICI and ICF. Although the functional relevance is unknown, we hypothesize decreased facilitation and increased inhibition may contribute to the restriction of movement of a painful body part.Perspective: This article provides evidence for decreased intracortical facilitation and increased short interval intracortical inhibition in response to muscle pain. This finding is relevant to clinicians as a mechanism which may underlie restricted movement in acute and chronic pain.

Physical Activity, Sustained Sedentary Behavior, and Pain Modulation in Women With Fibromyalgia

Laura D. Ellingson, Morgan R. Shields, Aaron J. Stegner, Dane B. Cook — 2012-01-16

Abstract: Fibromyalgia (FM) has been conceptualized as a disorder of the central nervous system, characterized by augmented sensory processing and an inability to effectively modulate pain. We previously reported that physical activity is related to brain processing of pain, providing evidence for a potential mechanism of pain management. The purpose of this study was to extend our work by manipulating pain modulation and determining relationships to both physical activity and sustained sedentary behavior. Eleven women with FM completed accelerometer measures of physical activity and underwent functional magnetic resonance imaging of painful heat, administered alone and during distracting cognitive tasks. Results showed that physical activity was significantly (P < .005) and positively related to brain responses during distraction from pain in regions implicated in pain modulation including the dorsolateral prefrontal cortex (DLPFC), the dorsal posterior cingulate, and the periaqueductal grey. A significant negative relationship occurred in the left anterior insula. For sedentary time, significant negative relationships were observed in areas involved in both pain modulation and the sensory-discriminative aspects of pain including the DLPFC, thalamus, and superior frontal and pre- and post-central gyri. These results suggest that physical activity and sedentary behaviors are related to central nervous system regulation of pain in FM.Perspective: Our results support a promising benefit of physical activity and highlight the potentially deleterious effects of sustained sedentary behavior for pain regulation in FM. Studies aimed at increasing physical activity or reducing sedentary behavior and determining the impact of these on pain regulation are warranted.

Masthead

2012-02-01

Editorial Board

2012-02-01

Instructions to Authors

2012-02-01

The Journal of Pain

Time Series Analysis of California’s Prescription Monitoring Program: Impact on Prescribing and Multiple Provider Episodes

A Pilot Study of the Tolerability and Effects of High-Definition Transcranial Direct Current Stimulation (HD-tDCS) on Pain Perception

Physical Activity and Function in Adolescents With Chronic Pain: A Controlled Study Using Actigraphy

The Interruptive Effect of Pain in a Multitask Environment: An Experimental Investigation

The Economic Cost of Chronic Noncancer Pain in Ireland: Results From the PRIME Study, Part 2

Craving of Prescription Opioids in Patients With Chronic Pain: A Longitudinal Outcomes Trial

Repetitive Treatment With Diluted Bee Venom Reduces Neuropathic Pain Via Potentiation of Locus Coeruleus Noradrenergic Neuronal Activity and Modulation of Spinal NR1 Phosphorylation in Rats

How Do I Empathize With You? Let Me Count the Ways: Relations Between Facets of Pain-Related Empathy

The Association Between Race and Neighborhood Socioeconomic Status in Younger Black and White Adults With Chronic Pain

Muscle Pain Differentially Modulates Short Interval Intracortical Inhibition and Intracortical Facilitation in Primary Motor Cortex

Physical Activity, Sustained Sedentary Behavior, and Pain Modulation in Women With Fibromyalgia

Masthead

Editorial Board

Table of Contents

Instructions to Authors