Δευτέρα 8 Ιουλίου 2019

Pain

Non-specific Low Back Pain: Inflammatory Profiles of Patients with Acute and Chronic Pain
Background: The pathogenesis of low back pain (LBP) remains unclear. However, recent studies suggest that the inflammatory response may be inherent in spinal pain. Purpose: To discern inflammatory profiles in patients with non-specific acute and chronic low back pain (LBP) in relation to those in asymptomatic subjects. Methods: Peripheral blood samples were obtained from asymptomatic subjects and patients with non-specific acute and chronic LBP reporting a minimum pain score of 3 on a 10-point visual analogue scale (VAS). The levels of in vitro production of pro-inflammatory (TNFα, IL-1β, IL-6, IL-2, IFN[Latin Small Letter Gamma]) and anti-inflammatory (IL-1 RA, sTNFR2 and IL-10) mediators were determined by specific immunoassays. Results: The mean VAS scores were comparable between the acute and chronic LBP patient groups. Compared to asymptomatic subjects, the production of TNFα, IL-1β, IL-6 and their ratios to IL-10 levels were significantly elevated in both patient groups (P=0.0001-0.003). In acute LBP group, the ratio of IL-2: IL-10 was also significantly increased (P=0.02). In contrast, the production of IFN[Latin Small Letter Gamma] was significantly reduced compared with the other study groups (P=0.005-0.01), nevertheless, it was positively correlated (P=0.006) with pain scores. In chronic LBP patients, the production of TNFα, IL-1RA and sTNFR2 was significantly increased (P=0.001-0.03) in comparison with the control and acute LBP groups, and TNFα and IL-1β levels were positively correlated (P<0.001) with VAS scores. Conclusion: The inflammatory profiles of patients with acute and chronic LBP are distinct. Nonetheless, in both patient groups, an imbalance between pro- and anti-inflammatory mediator levels favors the production of pro-inflammatory components. ACKNOWLEDGMENTS: We wish to express our appreciation and gratitude to Dr. A. Teitelbaum for performing phlebotomy. The excellent technical assistance of Ms. A. Corless is deeply appreciated. Conflict of Interest and Source of Funding: All authors declare that they have no conflict of interest to disclose regarding this manuscript. The study was supported by funds from Canadian Memorial Chiropractic College. Reprints: H. Stephen Injeyan, PhD, DC, Canadian Memorial Chiropractic College, 6100 Leslie Street, Toronto, Ontario, M2H 3J1, Canada (e-mail: sinjeyan@cmcc.ca). Received December 27, 2018 Received in revised form May 15, 2019 Accepted June 14, 2019 This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal. http://creativecommons.org/licenses/by-nc-nd/4.0/ Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.

Validity of the Budapest Criteria for Post-stroke Complex Regional Pain Syndrome
Objectives: Complex regional pain syndrome-1 (CRPS-1) is a chronic neuropathic disorder, and post-stroke CRPS (PS-CRPS) is not a rare complication. There is a lack of study implementing the Budapest criteria for PS-CRPS diagnosis. Thus, the present study investigated the validity of the Budapest criteria for PS-CRPS diagnosis and assessed the PS-CRPS-related factors in stroke patients with an affected upper extremity. Methods: The study included 72 patients with first-ever stroke resulting in hemiplegia. The prevalence of PS-CRPS and diagnostic validity were compared among the Budapest clinical criteria, Budapest research criteria, modified Budapest criteria (removal of the motor factor from the motor/trophic category), and International Association for the Study of Pain (IASP) criteria in patients diagnosed with PS-CRPS according to the Budapest clinical criteria. Results: PS-CRPS was diagnosed in 6 (8.3%), 1 (1.4%), 6 (8.3%), and 11 patients (15.3%) according to the Budapest clinical criteria, Budapest research criteria, modified Budapest criteria, and IASP criteria, respectively. The Budapest criteria and IASP criteria had sensitivities of 0.99 and 1.00, respectively, and specificities of 0.68 and 0.41, respectively, for PS-CRPS diagnosis. There were no differences in risk factors between PS-CRPS patients and non-PS-CRPS patients when the diagnosis was based on the Budapest clinical criteria. However, there were differences in muscle strength and Brunnstrom stage between PS-CRPS patients and non-PS-CRPS patients when the diagnosis was based on the IASP criteria. Discussion: Our findings indicate that the diagnostic validity of the current Budapest clinical criteria for PS-CRPS is low. Thus, the current Budapest criteria might not be appropriate for PS-CRPS diagnosis. Acknowledgments: We would like to thank Editage (http://www.editage.co.kr) for English language editing. There are no conflicts of interest. Conflicts of Interest and Source of Funding: We would like to thank Editage (http://www.editage.co.kr) for English language editing. Reprints: Joon-Ho Shin, MD, MS, Department of Rehabilitation Medicine, National Rehabilitation Center, 58, Samgaksan-ro, Gangbuk-gu, Seoul, 01022, Republic of Korea (e-mail: asfreelyas@gmail.com). Received January 17, 2019 Accepted June 17, 2019 Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.

Mandatory Pain Assessment in a Pediatric Emergency Department: Failure or Success? A Retrospective Study
Objective: Pain control is a priority in patient evaluation. Despite the proliferation of guidelines, pain is still under assessed and undertreated, especially in children. To improve efficiency and to adhere to best medical practice, our triage software was upgraded; it included mandatory pain scoring for the admission of a child to the pediatric emergency service, thereby limiting the chances of overlooking a child experiencing pain. We conducted this study to verify the effect of routine versus mandatory pain scoring on pain management under the hypothesis that mandatory pain assessment would improve re-evaluation and pain treatment. Methods: This retrospective case-control study was conducted in our Pediatric Emergency Department. We collected data regarding pain assessment and reassessment at triage and during the entire stay in the ED, as well as the drugs eventually administered. We reviewed the charts of 1274 patients admitted with the older triage software and of 1262 patients admitted with the newer triage software (intervention group). Results: Pain was evaluated significantly more frequently in the intervention group at triage, during medical evaluation, and at discharge. In the intervention group, a smaller percentage of patients were treated for pain at both triage and during their stay in the ED (P=0.078 and P=0.048). Pain re-assessment resulted worse in the intervention group (P<<0.001). Discussion: Mandatory pain assessment improved the pain evaluation rate. This did not, however, translate into better treatment and management of pain in the pediatric emergency setting. No funding sources were provided for this study. DISCLOSURE: The authors declare no conflict of interest. Reprints: Federico Marzona, MD, University of Udine, Department of Medicine (DAME), "S. Maria della Misericordia" Academic Hospital, 33100, Udine, Italy (e-mail: federico.marzona@asuiud.sanita.fvg.it). Received December 11, 2018 Received in revised form June 4, 2019 Accepted June 24, 2019 Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.

Patient and Disease Characteristics Associates With Sensory Testing Results in Chronic Pancreatitis
Background: Abdominal pain is the most common symptom in chronic pancreatitis and has extensive impact on patients' lives. Quantitative sensory testing (QST) provides information on sensitivity to pain and mechanisms which can help quantify pain and guide treatment. The aims of this study were (1) to explore sensitivity to pain in patients with chronic pancreatitis using QST, and (2) to associate patient- and disease characteristics with QST results. Methods: Ninety-one patients with painful chronic pancreatitis and 28 healthy control subjects completed a QST paradigm using static tests (muscle pressure stimulation and electrical skin stimulations) to unravel segmental and widespread hyperalgesia as a consequence of visceral pain. A dynamic conditioned pain modulation (CPM) paradigm was used as proxy of pain modulation from brainstem to inhibit incoming nociceptive barrage, and questionnaires were used to gather information on pain experience and quality of life. Results: Patients had impaired conditioned pain modulation compared to controls (18.0±29.3% vs. 30.9±29.3%, P=0.04) and were hypersensitive to pressure stimulation, specifically in the pancreatic (Th10) dermatome (P<0.001). The capacity of CPM was associated with clinical pain intensity (P=0.01) and (in univariate analysis only) the use of opioids was associated with hyperalgesia to pressure stimulation (P<0.05). Conclusion: Sensitivity to pain in chronic pancreatitis patients can be characterized by a simple bedside QST. Severe clinical pain in chronic pancreatitis was associated with reduced CPM function and should be targeted in management. Funding sources: None declared. Disclosures: The authors have nothing to disclose. Conflict of interest: None declared. Reprints: Asbjørn Mohr Drewes, MD, PhD, DMSc, Centre for Pancreatic Diseases, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Mølleparkvej 4, 9000 Aalborg, Denmark (e-mail: amd@rn.dk). Received January 23, 2019 Received in revised form June 4, 2019 Accepted June 14, 2019 This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal. http://creativecommons.org/licenses/by-nc-nd/4.0/ Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.

Insomnia Increases Symptom Severity and Health Care Utilization in Patients with Fibromyalgia: A Population-based Study
Objective: This study aimed to determine whether comorbid insomnia is associated with increased use of fibromyalgia-related medications and health resources in fibromyalgia patients. Methods: We analyzed data retrieved from the Longitudinal Health Insurance Database 2010, which contains claims data of 1 million beneficiaries randomly selected from Taiwan's National Health Insurance program. Patients treated for fibromyalgia (n=17, 920) on two separate visits between 2000 and 2001 were selected and subsequently divided into two groups: patients with and without comorbid insomnia (n=5466 and 12, 454, respectively). Insomnia was identified through diagnosis on two separate visits after the index fibromyalgia date. Fibromyalgia-related pharmacotherapies and ambulatory care visits were tracked from the index date to the end of 2013. Results: Insomnia was associated with increased likelihood of future use of antidepressants (adjusted odds ratio (OR)=3.84, P<0.001), gabapentin (adjusted OR=1.67, P<0.001), pregabalin (adjusted OR=1.79, P=0.046), muscle relaxants (adjusted OR=3.05, P<0.001), and opioids and tramadol (adjusted OR=1.59, P<0.001) among fibromyalgia patients compared with fibromyalgia patients without insomnia. In addition, a diagnosis of insomnia was associated with an increased frequency of visits to ambulatory care services for both fibromyalgia (β=1.79, 95% CI=1.57–2.02, P<0.001) and other conditions (β=108.51, 95% CI=103.14–113.89, P<0.001). Discussion: This study demonstrates the substantial burden of comorbid insomnia in patients with fibromyalgia. CJ Huang and CL Huang contributed equally to the paper. Author contribution: Pei-Shan Tsai contributed to the conception of the idea, the study design, and to acquisition, analysis and interpretation of data; drafted and revised the manuscript; gave final approval; and agreed to be accountable for all aspects of work ensuring integrity and accuracy. Chun-Jen Huang and Chin-Liang Huang contributed to the conception of the idea, analysis and interpretation of results; drafted and revised the manuscript; gave final approval; and agreed to be accountable for all aspects of work ensuring integrity and accuracy. Yen-Chun Fan and Ting-Yu Chen were involved in the analysis and interpretation of data, drafting and revising the manuscript; gave final approval; and agreed to be accountable for all aspects of work ensuring integrity and accuracy. Conflicts of interest and source of funding: Chun-Jen Huang, Chin-Liang Huang; Yen-Chun Fan, Ting-Yu Chen and Pei-Shan Tsai declare that there is no conflict of interest regarding the publication of this paper. This study was supported by grants from Taiwan Ministry of Science and Technology (MOST #105-2314-B038-052-MY3 & MOST #107-2314-B038-023-MY3). Reprints: Pei-Shan Tsai, PhD, Taipei Medical University, 250 Wuxing St. Taipei 11031, Taiwan (e-mail: ptsai@tmu.edu.tw). Received January 29, 2019 Received in revised form April 28, 2019 Accepted June 4, 2019 This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal. http://creativecommons.org/licenses/by-nc-nd/4.0/ Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.

Effects of Conditioned Pain Modulation on the Nociceptive Flexion Reflex in Healthy People: A Systematic Review
Objectives: The nociceptive flexion reflex (NFR) is a spinal reflex induced by painful stimuli resulting in a withdrawal response. Research has shown that the NFR is inhibited through endogenous pain inhibitory mechanisms, which can be assessed by conditioned pain modulation (CPM) paradigms. Although accumulating research suggests that the NFR can be affected by CPM, no clear overview of the current evidence exists. Therefore, the present review aimed at providing such a synthesis of the literature. In addition, the influence of personal factors on the CPM of the NFR was investigated. Materials and Methods: A systematic review was performed and reported following the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) guidelines. Five electronic databases were searched to identify relevant articles. Retrieved articles were screened on eligibility using predefined inclusion criteria. Risk of bias was investigated according to the modified Newcastle-Ottawa Scale. Levels of evidence and strength of conclusion were assigned following the guidelines of the Dutch Institute for Healthcare Improvement. Results: Forty articles were included. There is some evidence that CPM produced by thermal or mechanical stimuli induces inhibitory effects on the NFR. However, inconclusive evidence exists with regard to the effect of electrical conditioning stimuli. While several personal factors do not affect CPM of the NFR, increased cognitive interference is associated with reduced NFR inhibition. Discussion: The present review demonstrates that certain types of nociceptive conditioning stimuli have the potential to depress, at the spinal level, nociceptive stimuli elicited from distant body regions. Although CPM of the NFR seems to be robust to the influence of several personal factors, it can be affected by cognitive influences. J.V.O. is a postdoctoral research fellow funded by the Research Foundation—Flanders (FWO) (12L5616N) Brussels, Belgium. S.V.O. is a PhD researcher supported by a research project grant from the Research Foundation—Flanders (FWO) received by L.D. and J.V.O. (G0B3718N). I.C. is a postdoctoral researcher funded by the Research Foundation—Flanders (FWO) (G007217N) and the Agency for Innovation by Science and Technology (IWT)—Applied Biomedical Research Program (TBM) (150180), Brussels, Belgium. The remaining author declare no conflict of interest. Reprints: Jessica Van Oosterwijck, PhD, Department of Rehabilitation Sciences, SPINE Research Unit Ghent, Ghent University, Campus UZ Ghent, Corneel Heymanslaan 10, B3, Ghent 9000, Belgium (e-mail: jessica.vanoosterwijck@ugent.be). Received February 4, 2019 Received in revised form March 22, 2019 Accepted April 8, 2019 Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.

Effect of Adding Dexmedetomidine to Local Anesthetic Agents for Transversus Abdominis Plane Block: A Meta-analysis
Background: Dexmedetomidine (Dex) has been used adjuvant in Transversus abdominis plane (TAP) blocks. This meta-analysis was aimed at evaluating the effect of Dex in TAP blocks. Objectives: Outcome measures were total opiate consumption in 24-hours after surgery, time to systemic rescue analgesia, pain scores after surgery, and adverse events. Materials and methods: Randomized controlled trials (RCTs) comparing Dex with local anesthetics (LAs) to LAs alone for analgesia after abdominal surgeries were searched included. Standardized mean difference (SMD) and mean difference (MD) were used for continuous variables, and odds ratio for frequency data. Results: Analysis of data from 9 RCTs (598 patients) showed that addition of Dex to LAs decreased opiate use in 24 hours after surgery (SMD −3.07, 95% CI: −4.78, −1.35), increased time to rescue analgesia (171.8▒min, 95% CI: 112.34, 231.26), and decreased pain scores (scale of 0-10) at 4 hours (MD −0.36, 95% CI: −0.65, −0.07) and 8 hours (MD −0.17, 95% CI: −0.29, −0.04) after surgery. Frequency of adverse events was similar between the two groups (OR 1, 95% CI: 0.61-1.63). The estimates for pain scores were prone to sensitivity analysis. The estimates for post-op opiate use, time to rescue analgesia and pain scores at 8 hours had significant heterogeneity. Conclusions: Addition of Dex to LAs in TAP block for analgesia after abdominal surgeries decreased 24 hour opiate use and increased the overall time to rescue analgesia including certain subgroups without increasing adverse events. Its effect on post-op pain scores was not as definitive. Disclosures: None. Source of funding: None. Conflicts of Interest: None. Reprints: Prannal Bansal, MD, 4301 W. Markham St., Little Rock, AR-72205 (e-mail: pbansal@uams.edu). Received September 14, 2018 Received in revised form June 12, 2019 Accepted June 18, 2019 Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.

Individualization of Migraine Prevention: A Randomized Controlled Trial of Psychophysical Based Prediction of Duloxetine Efficacy
Objective: Finding an effective preventive agent for the individual migraineur is often long and frustrating. An individual-specific, efficacy-predicting tool, would be invaluable in directing, shortening, and improving this process. As the serotonin norepinephrine reuptake inhibitors (SNRI) duloxetine is a pain modulator, we hypothesized that pro-nociceptivity will directly predict drug efficacy, so that the more pro-nociceptive the patient is, the more efficacious the drug. Therefore, we used psychophysical pain measures to predict duloxetine efficacy in migraine prevention. Methods: Fifty-five migraineurs participated; 27 received duloxetine and 28 non-active placebo. Responses to painful stimuli, conditioned pain modulation and temporal summation of pain were measured before treatment. Treatment outcome-measures included changes in attack-frequency, migraine-days, pain levels and a reported self-estimate of migraine-improvement at weeks four and five. To examine treatment effects, outcome-measures were compared to pre-treatment levels. Treatment by psychophysical-predictor effect on treatment-outcome were examined in separate regression models. Results: Duloxetine was more efficacious than placebo in migraine prevention as indicated by the patient's estimation of migraine-improvement (duloxetine: 52.3±30.4%; placebo: 26.0±27.3%; P=0.001). Further, this measure, in the duloxetine group, was predicted by higher pre-treatment pain ratings for tonic heat pain (P=0.012); greater pain-sensitivity at baseline predicted greater percent of migraine-improvement in duloxetine, (r=0.47; P=0.013) but not in placebo (r=−0.36; P=0.060). Discussion: Our results suggest how personalized medicine can be applied to designing appropriate migraine prevention treatment. Psychophysical testing can reveal and characterize pro-nociceptive migraineurs, who seem to be more likely than non pro-nociceptive ones to benefit from migraine prevention with SNRIs. ClinicalTrials.gov identifier: NCT01470339 Acknowledgments: This study was financially supported by the United States–Israel Binational Science Foundation grant number 2009097. Conflict of Interest: Dr. Kisler has nothing to disclose; Dr. Granovsky, Prof. Coghill, Prof. Yarnitsky and Dr. Weissman-Fogel report grant from United States–Israel Binational Science Foundation, during the conduct of the study; Dr. Granovsky also has a patent Thermal stimulation probe and method issued; Prof. Yarnitsky also holds equity in BrainsGateLtd. and Theranica Ltd. Dr. Sprecher has nothing to disclose; Reprints: Yelena Granovsky, PhD, Department of Neurology, Rambam Health Care Campus, HaAliya HaShniya St 8, Haifa, 3109601, Israel (e-mail: y_granovsky@rambam.health.gov.il). Received October 8, 2018 Received in revised form June 1, 2019 Accepted June 6, 2019 Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.

Improving Distress and Behaviors for Parents of Adolescents with Chronic Pain Enrolled in an Intensive Interdisciplinary Pain Program
Objectives: Intensive interdisciplinary treatment is emerging as an effective treatment of chronic pain in youth. These programs often include a parental component with the belief that targeting parental distress and responses to a child's pain will improve outcomes. However, few studies have evaluated the impact of a parental intervention in the interdisciplinary treatment of pediatric chronic pain. The present study consists of a nonrandomized pre-post design to evaluate change in psychological and behavioral functioning of parents who participated in intensive parent programming that utilized Cognitive Behavioral Therapy (CBT) and Acceptance and Commitment Therapy (ACT), delivered within the context of an interdisciplinary intensive 3-week pain treatment program for youth with chronic pain. Methods: Two hundred and twelve parents and their children participated in the study, with 116 participants completing 3-month follow-up measures. Parents completed measures of depressive symptoms, pain catastrophizing, protective responses, and psychological flexibility at admission, discharge, and 3-months after the program. Child functional disability was assessed at the same time points. We examined change in parent factors over time, while controlling for change in child distress. Results: Parents reported significant improvements in all areas of functioning from admission to discharge and improvements were maintained at 3-month follow-up. Discussion: This study provides evidence suggesting parent interventions can be effective in reducing parent distress and behaviors known to be associated with child outcomes. Note: there are no sources of support for acknowledgement. The authors declare no conflict of interest. Reprints: Karen Weiss, PhD, 4800 Sand Point Way NE, Seattle WA, 98105. Mail MB.11.500.3 PO Box 5371 (e-mail: karen.weiss@seattlechildrens.org). Received October 30, 2018 Received in revised form May 29, 2019 Accepted May 29, 2019 Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.

Comparing Post-operative Analgesic Effect of Dexmedetomidine or Dexamethasone Added to Lidocaine Through Infraclavicular Block in Forearm Surgery
Objective: To compare the analgesic efficacy of the dexamethasone versus dexmedetomidine added to lidocaine using infraclavicular block in patients undergoing forearm fracture surgery. Method: Seventy-five patients 20-60 years old were recruited for a prospective, double-blinded, randomized clinical trial. Ultrasound-guided infraclavicular brachial plexus block was performed in three groups by injecting with 28▒mL lidocaine plus2▒mL distilled water (Lido), 28▒mL lidocaine plus2▒mL (8▒mg) dexamethasone (Dexa), and 28▒mL lidocaineplus2▒mL (1▒µg/kg) dexmedetomidine (Dexm).Sensory and motor block onset time and the duration, hemodynamic variables, the time for the first analgesic request, and the total analgesic agents consumed within 6 hours after infraclavicular block were assessed. Results: Sensory block duration in dexmedetomidine group was significantly greater than Lido (P=0.019) and Dexa (P=0.046) groups. The mean motor block duration in dexmedetomidine group showed to be significantly longer than Lido group (P=0.009). Pain intensity within 4 hours after block significantly increased in Lido group compared to those of Dexa and Dexm groups (P=0.001). Analgesic consumption during 6 hours after the procedure was higher in group Lido when compared to other two groups (P=0.001). The dexamedetomidine group showed the highest reduction in the mean arterial pressure (P=0.006) and heart rate (P=0.001) between the three groups. Conclusions: There was no significant difference in postoperative pain intensity between the dexamethasone and dexmedetomidine groups, although, dexmedetomidine demonstrated a longer sensory block duration in comparison with dexamethasone as a lidocaine adjuvant in infraclavicular block. Registration number: IRCT2016011423473N2. Contribution to Authorship: Siamak Yaghoobi was the co-author who suggested the topic and the conceptual framework for this research. Hoda Shahamat was in charge of data acquisition and drafting the manuscript. Ali Alizadeh was another co-author who contributed to finalizing the title of the study and also participated in the preparation of final conceptual framework design. Marzieh Beigom Khezri was the co-author who actively helped towards the final maturation of the initial idea and the concept of the study, data interpretation, and critically reviewing the manuscript. Conflicts of interest statement: The authors of this paper have not declared any conflict of interest. Reprints: Marzieh Beigom Khezri, Department of Anesthesiology, Faculty of Medicine, Qazvin University of Medical Sciences, Shahid Bahonar Ave., PO Box 3419759811, Qazvin, Iran (e-mail: mkhezri@qums.ac.ir). Received September 2, 2018 Received in revised form May 2, 2019 Accepted May 23, 2019 Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.

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