The long-term outcome of transcutaneous electrical nerve stimulation in the treatment for patients with chronic pain: a randomized, placebo-controlled trial.

BACKGROUND: Transcutaneous electrical nerve stimulation (TENS) is an easy to use analgesic intervention. However, long-term randomized placebo-controlled studies with treatment periods of more than 3 months have not been executed to date. The aim of our study is to explore the long-term (1 year) time course of the treatment effects of TENS compared to placebo (sham TENS). METHOD: We performed a randomized placebo-controlled trial in patients with chronic pain (165), referred to a multidisciplinary pain center of a university hospital. Main outcome measures are the proportion of patients satisfied with treatment result and willing to continue treatment, pain intensity, pain disability, and perceived health status. RESULTS: Survival analysis of time courses of proportions of satisfied patients revealed no significant differences (P = 0.79; log-rank test) for TENS treatment compared to sham TENS. After 1 year, 30% (24/81) of the patients of the TENS group and 23% (19/82) of the sham TENS group were satisfied with treatment result. These patients experienced a mean overall improvement of 62.7% (n = 43). This effect was not significantly different between both groups. For satisfied patients, there were no differences in pain intensity or disability and perceived health status between the TENS and sham TENS group. CONCLUSIONS: Transcutaneous electrical nerve stimulation and sham TENS show similar effects in patients with chronic pain over a period of 1 year. We found support for a long sustained placebo effect.

Multidisciplinary allocation of chronic pain treatment: effects and cognitive-behavioural predictors of outcome.

OBJECTIVES: Multidisciplinary treatment approaches have been found to be effective for chronic pain patients although there are large individual differences in outcomes. To increase overall treatment effects, tools are needed to identify patients most likely to benefit from tailored, comprehensive modular treatment schemes. DESIGN: The present study evaluates the effects of a multidisciplinary pain treatment allocation protocol in chronic pain patients and seeks to identify cognitive-behavioural predictors of outcome. Pain intensity, functional disability, depression, and use of medication in an intervention group of 110 chronic pain patients were compared to the outcomes of a 110 strong control group. RESULTS: Paired pre- and post-treatment t tests showed that all primary outcomes had significantly decreased in the intervention group with ANCOVAs revealing a main group effect for post-treatment pain intensity levels and functional disability. Paired t tests demonstrated both variables to have significantly reduced after treatment relative to the levels reported by the control group. Predictor analyses further showed higher levels of acceptance to significantly predict larger reductions in pain intensity in the intervention but not in the control group. CONCLUSION: The tested multidisciplinary allocation scheme for out-patient treatment of chronic pain complaints was effective in reducing pain intensity and functional disability. Findings also showed that especially those patients that are able to accept their condition are likely to profit most from the treatment in terms of pain reduction.

Dealing with delicate issues in continuous deep sedation. Varying practices among Dutch medical specialists, general practitioners, and nursing home physicians.

BACKGROUND: This article examines delicate issues in continuous deep sedation (CDS) from the perspectives of different types of physicians. The following sensitive issues involved in CDS were investigated: artificial hydration, sedation for nonphysical discomfort, the relationship between CDS and euthanasia, and patient involvement in decision making for CDS. METHODS: A structured retrospective questionnaire concerning the most recent case of CDS during the past 12 months was sent to a sample of medical specialists (n = 727), general practitioners (n = 626), and nursing home physicians (n = 111). RESULTS: Response rates were 26.4% for medical specialists, 37.4% for general practitioners, and 59.5% for nursing home physicians. Indications for CDS differed among the types of physicians. General practitioners (25.0%) were most often confronted with a patient request for euthanasia before starting CDS compared with medical specialists (8.9%) and nursing home physicians (6.5%). A decision to forgo artificial hydration in CDS was more often made by nursing home physicians (91.3%) compared with medical specialists (53.7%) and general practitioners (51.2%). Shorter survival was found for patients sedated for nonphysical discomfort (vs other patients) by general practitioners. Among all patients, 74.5% were involved in decision making before the start of CDS. CONCLUSIONS: The present study demonstrates notable differences in CDS practice among various types of physicians. To what extent this is related to different patient populations or to different expertise requires further investigation. The use of CDS for nonphysical discomfort calls for critical examination to avoid ambiguous practice.

Improving prescription in palliative sedation: compliance with dutch guidelines.

BACKGROUND: Two guidelines addressing palliative sedation have been published in the Netherlands in 2002 and 2003. The objective of the present study is to determine adherence to the guidelines for palliative sedation with regard to prescription. The study is restricted to the practice of continuous deep palliative sedation. METHODS: A structured retrospective questionnaire was administered to 1464 physicians concerning their last case of deep sedation during the past 12 months. Physicians included Dutch hospital specialists, general practitioners, and nursing home physicians. RESULTS: The response rate was 36%. A total of 43% (95% confidence interval [CI], 37%-49%) of the responding physicians did not adhere to the guidelines. Sources of deviation were the use of basic medication other than a benzodiazepine (30%), which mostly involved morphine, and omissions in adjuvant medication (13%). Nonsignificant positive association was found for consultation of a palliative care expert (odds ratio [OR], 3.86; 95% CI, 0.92-8.87). Significant positive association was found for the physician being a palliative care expert himself or herself (OR, 4.42; 95% CI, 1.42-13.75) and the use of guidelines (OR, 1.74; 95% CI, 1.02-2.98). Treatment of pain symptoms (OR, 2.21; 95% CI, 1.28-3.82), anxiety (OR, 2.32; 95% CI, 1.33-4.06), vomiting (OR, 6.52; 95% CI, 1.08-39.50), and loss of dignity (OR, 3.93; 95% CI, 1.80-8.58) also correlated positively. Treatment of delirium correlated negatively with adherence to the guidelines (OR, 0.22; 95% CI,0.11-0.44). CONCLUSIONS: The rate of 43% noncompliance to the guidelines was mostly owing to the omission of continued antipsychotic treatment for delirium and the use of morphine as the single therapy for the purpose of deep sedation. Future efforts, like better use and knowledge of the guidelines and a larger involvement of consultation teams, should increase adherence to the guidelines.

Consultation in palliative care: the relevance of clarification of problems.

This study aims to determine the extent and nature of problems in palliative care that are newly identified in the consultation process and the factors influencing their identification. The consultation process includes clarification of problems mentioned by professionals requesting advice. Data are derived from the standard registration forms of Palliative Care Consultation teams. Multilevel logistic regression analysis was carried out with newly identified problem as dependent variable. Fifty seven percent of problems (n=7854) were newly identified. Most newly identified problems were related to physical and pharmacological problems. If psychosocial/spiritual problems were identified, this occurred in most cases through clarification (70%). Newly identified problems were more likely to be identified in the domain of spiritual and psychosocial problems, in bedside consultations, in requests from clinical physicians, and for patients accommodated in a hospice or hospital. Explicit clarification of problems facilitates the identification and addressing of a more comprehensive and specific scope of problems.

Living on borrowed time: experiences in palliative care.

OBJECTIVE: To gain insight into the experiences of a palliative care patient and her husband who were living on borrowed time. METHODS: A qualitative single case design was used. Systematic content analysis of the interview data, obtained in an in-depth semi-structured interview, from the husband and wife was conducted to extract themes relating to living on borrowed time. RESULTS: Three themes were identified: shifts in the interpretation of physical signs and symptoms, altered view of the future and altered choices and priorities. CONCLUSION: The identified themes lead to a better understanding of the phenomenon of living on borrowed time. Yet, refinement of, and variation within the themes still need to be studied in order to get more grips on the themes and to be better able to help patients to integrate the 'new reality'. PRACTICE IMPLICATIONS: Our findings can be used to support professionals in the practical application of care when their patients need to integrate the 'new reality' and seek new equilibrium, e.g. converted into a conversational guide, or used for educational purposes.

The role of helplessness, fear of pain, and passive pain-coping in chronic pain patients.

OBJECTIVES: The goal of this study was to examine the relative contribution of helplessness, fear of pain, and passive pain-coping to pain level, disability, and depression in chronic pain patients attending an interdisciplinary pain center. METHODS: One hundred sixty-nine chronic pain patients who had entered treatment at an interdisciplinary pain center completed various questionnaires and a pain diary. RESULTS: Helplessness, fear of pain, and passive pain-coping strategies were all related to the pain level, disability, and depression. When comparing the contribution of the predictors in multiple regression analyses, helplessness was the only significant predictor for pain level. Helplessness and the passive behavioral pain-coping strategies of resting significantly predicted disability. The passive cognitive pain-coping strategy of worrying significantly predicted depression. CONCLUSIONS: These findings indicate a role for helplessness and passive pain-coping in chronic pain patients and suggest that both may be relevant in the treatment of pain level, disability, and/or depression.

The efficacy of radiofrequency lesioning of the cervical spinal dorsal root ganglion in a double blinded randomized study: no difference between 40 degrees C and 67 degrees C treatments.

The efficacy of radiofrequency lesion treatment of the cervical dorsal root ganglion (RF-DRG) in cervicobrachialgia was investigated in 61 patients by a randomized prospective double blinded study. Before lesion treatment the putative pain provoking spinal root was identified by diagnostic blocks with a local anesthetic agent. One group of patients (n = 32, group I) was treated with a radiofrequency lesion of 67 degrees C and in a control group (n = 29, group II) a temperature of 40 degrees C was applied. Three months after treatment a significant reduction in VAS scores was demonstrated in both groups. The outcome of the treatments was identical (VAS reduction: group I, 1.7; group II, 1.9; P = 0.001). In group I a VAS reduction of 3 or more occurred in 11/31 (34%) and in group II in 11/29 (38%) of patients. A VAS reduction of 2 or more occurred in group I in 15/31 (47%) and in group II in 15/29 (51%) of patients. This study suggests that treatment with 40 degrees C radiofrequency application of the dorsal root ganglion is equally effective as treatment at 67 degrees C. Further appraisal of this treatment is required.

Methadone for phantom limb pain.

OBJECTIVE: The objective of this case series was to determine if severe phantom limb pain could be reduced with oral methadone. DESIGN: Four cases of phantom limb pain refractory to multiple treatment modalities were treated with oral methadone. SETTING: Pain clinic at a major university medical center. PATIENTS: Four patients with severe, intractable phantom limb pain. INTERVENTION: Oral methadone was administered, starting with a low dose of 2 to 5 mg twice a day or three times a day and slowly titrated upward to achieve pain relief. OUTCOME MEASURES: Repeated administration of a visual analog scale for pain. RESULTS AND CONCLUSIONS: Administration of oral methadone may be of value in the treatment of phantom limb pain; controlled clinical trials would be appropriate to verify this observation.

Adrenalectomy affects pain behavior of rats after formalin injection.

Stressful stimuli can activate the hypothalamo-pituitary-adrenal-axis and the endogenous opioid system. In addition, corticosterone and opioid release might cause analgesia. This rat study used adrenalectomy for corticosterone withdrawal and naloxone administration for opioid antagonism in order to study pain behavior and hypophyseal hormone release in the plasma after a formalin test. Twelve days before the formalin testing, male Sprague Dawley rats underwent adrenalectomy or sham-adrenalectomy, and non-operated rats were used as reference. The number of flinches and the duration of licking or biting behavior were measured during the early and late phase. In reference and sham-operated rats, injection of formalin 5% resulted in a marked pain behavior in the early and late phase with significant increases in ACTH and corticosterone plasma levels. In adrenalectomized rats, pain behavior was decreased during both phases. Naloxone, administered before the late phase, did not alter pain behavior in sham or reference rats, whereas in adrenalectomized rats pain reactivity returned to those levels observed in reference rats. Beta-endorphin plasma levels above the detection limit were more frequently found in adrenalectomized rats. Thyrotropin and prolactin levels were not different between studied groups. We speculate that the observed reduced pain behavior in adrenalectomized rats after formalin, is the result of an increased production of pro-opiomelanocortin, the pro-drug of both adrenocorticotrophic hormone and beta-endorphin.

No impaired hemoglobin oxygenation in forearm muscles of patients with chronic CRPS-1.

OBJECTIVES: Physiotherapy is considered an important treatment option in patients with upper limb complex regional pain syndrome type-1 (CRPS-1). In case of chronic CRPS-1, exercise therapy of the affected limb forms an important part of the physiotherapeutic program. We investigated whether muscle loading in chronic CRPS-1 patients is associated with impairments in muscle circulation of the forearm of the affected limb. METHODS: Thirty patients with chronic CRPS-1 unilaterally affecting their upper limbs, and 30 age-matched and sex-matched control participants were included in this study. Local muscle blood flow and hemoglobin oxygenation were measured by near infrared spectroscopy within the muscles of the forearm at rest, after 1-minute isometric handgrip exercises, and after arterial occlusion. Main outcome parameters were: local muscle blood flow, O2 consumption (mVO2), and postischemic reoxygenation (ReOx). RESULTS: We found no differences in baseline muscle blood flow, mVO2, and ReOx between the affected CRPS-1, unaffected CRPS-1, and control arms. After exercise, mVO2 of the affected CRPS-1 arms was not different from the clinically unaffected CRPS-1 arms. Furthermore, in comparison with the control arms, unaffected CRPS-1 arms showed no difference in mVO2 or ReOx. CONCLUSIONS: Muscle loading does not seems to be related to impairments in muscle oxygen uptake in forearm muscles of upper limbs affected by chronic CRPS-1. Our results suggest that exercise therapy can be safely used in physiotherapeutic training programs for chronic CRPS-1 of the upper limb.

Changed patterns in Dutch palliative sedation practices after the introduction of a national guideline.

BACKGROUND: Continuous sedation, contrary to euthanasia, has been increasingly accepted among medical professionals worldwide. In the Netherlands, a national guideline for continuous palliative sedation has been developed to contribute to the quality of palliative sedation practice. The present follow-up study investigated whether the practice of continuous sedation has changed after the introduction of this guideline. METHODS: This study compared the practice of continuous sedation before and after the introduction of the guideline on December 7, 2005. A baseline measurement was performed between February 1, 2003, and May 1, 2005, with an enrollment of 492 physicians (medical specialists, general practitioners, and nursing home physicians). From January 1 to June 30, 2007, after the introduction of a national guideline for palliative sedation, a follow-up study was performed with the respondents of the baseline study. Physicians were asked to report on their last case of deep and continuous sedation in the past 12 months. RESULTS: This study reports the results of the follow-up study and compares them to the results of the baseline study. The response rate was 69.3% (n = 341). Of these physicians, 160 reported a last case of continuous sedation in both the baseline and the follow-up studies. Physicians reported a significant increase in patient involvement in decision making, from 72.3% to 82.2%. Pain remained the most often reported reason to start sedation, whereas exhaustion as a reason for sedation increased. The use of benzodiazepines increased from 69.9% to 90.4%. In the first and second measurements, symptom-directed treatment during sedation was applied in 56% to 58% of the cases. In the second period, there was more often an explicit decision to not give artificial hydration during sedation (78.8% vs 56.3%). Of the physicians, 34.2% were convinced that sedation shortened the life of the patient because of dehydration. CONCLUSIONS: After the introduction of the guideline, physicians reported that changes in palliative sedation practice conform to the recommendations of this guideline. For example, benzodiazepines were used for sedation more frequently than before and patient involvement in the decision-making process improved. Possible effects of dehydration and the large variation in symptom-directed treatment during sedation deserve careful attention.

Predicting outcome of TENS in chronic pain: a prospective, randomized, placebo controlled trial.

UNLABELLED: Transcutaneous electrical nerve stimulation (TENS) is an easy to use non-invasive analgesic intervention applied for diverse pain states. However, effects in man are still inconclusive, especially for chronic pain. Therefore, to explore the factors predicting result of TENS treatment in chronic pain we conducted a prospective, randomized, placebo-controlled trial (n=163), comparing high frequency TENS (n=81) with sham TENS (n=82). Patients' satisfaction (willingness to continue treatment; yes or no) and pain intensity (VAS) were used as outcome measures. The origin of pain and cognitive coping strategies were evaluated as possible predictors for result of TENS treatment. RESULTS: Fifty-eight percent of the patients in the TENS group and 42.7% of the sham-TENS group were satisfied with treatment result (chi square=3.8, p=0.05). No differences were found for pain intensity. Patients diagnosed with osteoarthritis and related disorders (especially of the vertebral column) or peripheral neuropathic pain were less satisfied with high frequency TENS (OR=0.12 (95% CI 0.04-0.43) and 0.06 (95% CI 0.006-0.67), respectively). Injury of bone and soft tissue (especially postsurgical pain disorder) provided the best results. Treatment modality or interactions with treatment modality did not predict intensity of pain as a result of treatment. We conclude, that predicting the effect of high frequency TENS in chronic pain depends on the choice of outcome measure. Predicting patients' satisfaction with treatment result is related to the origin of pain. Predicting pain intensity reflects mechanisms of pain behavior and perceived control of pain, independent of treatment modality. Pain catastrophizing did not predict TENS treatment outcome.

The role of fear-avoidance and helplessness in explaining functional disability in chronic pain: a prospective study.

OBJECTIVE: Based on the fear-avoidance and helplessness models, the relative contribution of fear of pain, avoidance behavior, worrying, and helplessness were examined in relation to fluctuations in functional disability in chronic-pain patients. METHODS: A cohort of 181 chronic-pain patients first completed various questionnaires and kept a 7-day pain journal during a standard 3-month waiting-list period prior to their scheduled treatment at an Interdisciplinary Pain Centre and did so again immediately preceding the intervention. RESULTS: At baseline, fear of pain, avoidance behavior, and helplessness all predicted functional disability after 3 months. Stepwise regression analyses showed avoidance behavior to be the strongest predictor of change in functional disability followed by helplessness, thus both ahead of fear of pain. CONCLUSION: The current findings support the roles of both fear-avoidance factors and helplessness in the functional disability in chronic-pain patients awaiting treatment but revealed a central role for avoidance behavior.

Obstacles to the delivery of primary palliative care as perceived by GPs.

INTRODUCTION: In order to facilitate GPs in their work and increase the possibilities for patients to remain at home, it is important to identify the obstacles which hinder the delivery of primary palliative care. From previous research we learned about some of the problems experienced by GPs. In this survey we aimed to identify the prevalence of such problems in providing palliative care and its determinants. METHODS: The prevalence of obstacles and its determinants were identified by a questionnaire to 320 GPs in three regions of the Netherlands. Obstacles were grouped as follows: communication, organisation & co-ordination of care, knowledge & expertise, integrated care, time for relatives. The potential determinants were GP characteristics and expertise development activities. RESULTS: The response rate was 62.3%. GPs experienced considerable obstacles in all aspects of palliative care. The most prevalent were: problems with bureaucratic procedures (83.9%), the time necessary to arrange home care technology (61.1%) and the difficulties accompanied with the wish or necessity to obtain extra care (56.3%). In general, more years of GP experience and the participation in (multidisciplinary) case discussions were associated with less perceived obstacles. DISCUSSION: Based on the results of our survey policymakers and practitioners can plan and set priorities in handling the obstacles. There is a high necessity of firstly overcoming the barriers within organisation and coordination of care. Furthermore, our study can help in choosing the (additional) expertise needed in the future and in the realisation of the preferred expertise advancement activities.

Outcome of transcutaneous electrical nerve stimulation in chronic pain: short-term results of a double-blind, randomised, placebo-controlled trial.

The aim of this study was to test the efficacy of shortterm transcutaneous electrical nerve stimulation (TENS) treatment in chronic pain with respect to pain intensity and patients' satisfaction with treatment results. We therefore performed a randomised controlled trial comparing TENS and sham TENS. Patients, researchers and therapists were blinded for treatment allocation. One hundred and sixty-three patients with chronic pain referred to the Pain Centre entered the study. Conventional TENS and sham TENS were applied in the segments of pain, for a period of ten days. Outcome measures were pain intensity (visual analogue scale) and patients' satisfaction with treatment result (yes or no). The proportions of patients satisfied with treatment result differed significantly for TENS compared to sham TENS (58 and 42.7% respectively, chi(2)=3.8, p=0.05). However, no differences in pain intensity were found for patients treated with TENS or sham TENS. Only for patients satisfied with treatment results pain intensity gradually decrease equally both for TENS and sham TENS with repeated treatment application.

The present role of percutaneous cervical cordotomy for the treatment of cancer pain.

The results obtained by percutaneous cervical cordotomy (PCC) were analysed in 43 terminally ill cancer patients treated in our institution from 1998 to 2001. We wished to determine whether there is still a place for PCC in the actual clinical situation with its wide choice of pain therapies. All patients had severe unilateral pain due to cancer, resistant to opioids and co-analgesics. Following PCC, mean pain intensity was reduced from Numeric Rating Scale (NRS) 7.2 to 1.1. At the end of life, pain had increased to NRS 2.9. Initially following PCC a good result (NRS<3) was obtained in 95% of patients. At the end of life, a good result was still present in 69% of patients. Mean duration of survival after the intervention was 118 days (2-1460). In general, complications were mild and mostly subsided within 3-4 days. There was one case of partial paresis of the ipsilateral leg. PCC remains a valuable treatment in patients with treatment-resistant cancer pain and still deserves a place in the treatment of terminal cancer patients with severe unilateral neuropathic or incidence pain.

General practitioners (GPs) and palliative care: perceived tasks and barriers in daily practice.

BACKGROUND: General practitioners (GPs) play a crucial part in palliative care. The quality of care can be improved by investigating and addressing barriers perceived by GPs in daily practice. The aim of this study was to investigate GPs' task perception and barriers involved in palliative care. METHODS: Qualitative focus group study. We gathered together a group of GPs representing a broad range of experience in palliative care. Content analysis was performed to derive a comprehensive view of tasks and barriers in daily palliative care. RESULTS: GPs described their palliative care tasks as satisfactory and varied, but burdensome. Palliative care tasks included somatic and psychosocial care. Opinions differed with respect to whether the coordination of care belonged to the primary GP tasks. Barriers were classified according to three levels: (1) personal: barriers related to knowledge, skills, emotions; (2) relational: barriers concerning communication and collaboration; (3) organizational: barriers related to the organization of care and compartmentalization in healthcare. CONCLUSIONS: This study revealed a complex web of tasks and barriers. It may be possible to trace back a problem (lack of knowledge, for example) on the personal level to an isolated knowledge gap, but the problem may well have originated from communication or compartmentalization problems. To maintain GPs' feeling of being at ease with palliative care requires helping them acquire the appropriate balance between technical and organizational interventions and a compassionate orientation to their terminally ill patients.

Requests from professional care providers for consultation with palliative care consultation teams.

GOALS OF WORK: Professional care providers need a substantial basis of competence and expertise to provide appropriate palliative care. Little is known about the problems professionals experience in their palliative care provision in daily practice or about the nature of the advice and support they request from experts. Our aim was to investigate the extent to which professionals requested assistance from palliative care consultation teams and the reasons behind these requests to trace any gaps they experience in the provision of palliative care. METHODS: As part of a large national palliative care development programme, we studied requests for consultation made by professional care providers over a 2-year period. The requests for consultation were recorded on a specially developed standard registration form and classified according to 11 domains relevant to palliative care. MAIN RESULTS: Professional care providers requested 4351 consultations on account of 8413 specific problems in 11 quality-of-life and quality-of-care domains. The distribution of problems over these domains was unbalanced: 42.2% of the specific problems were physical, while the percentages of psychological, pharmacological and organizational problems were 7.7, 12.5 and 12.8%, respectively. In contrast, issues of a spiritual nature or concerned with daily functioning were raised infrequently (1.1 and 0.9%). Details of the specific problems in all the domains are described in the text and tables. CONCLUSIONS: The results of our study form a valid basis on which to develop and implement improvements in palliative care. We recommend that future well-founded policies for palliative care should incorporate palliative care consultation as well as educational and organizational interventions.

Quantitative sensory testing and human surgery: effects of analgesic management on postoperative neuroplasticity.

BACKGROUND: Altered central nervous system sensory processing (neuroplasticity) is a basic mechanism underlying postoperative pain that can be made visible using quantitative sensory testing. Using quantitative sensory testing, the authors investigated how perioperative analgesia affects postoperative neuroplasticity and how this relates to clinical pain measures. METHODS: Patients undergoing back surgery received placebo, fentanyl, or ketorolac (n = 15 per group) before isoflurane-nitrous oxide anesthesia. Preoperatively to 5 days postoperatively, we measured thresholds to electrical skin stimulation at the incision site, arm, and leg; pain scores; and morphine patient-controlled analgesia consumption. RESULTS: Decreased pain thresholds versus preoperatively were seen 5 days postoperatively, with decreases greater for ketorolac (-63%; P = 0.00005 vs. preoperatively) than placebo (-45%; P = 0.008 vs. preoperatively) but nonsignificant for fentanyl (-36%; P = 0.9 vs. preoperatively). Mainly nonnociceptive thresholds were increased up to 24 h postoperatively. Postoperative clinical pain measures were similar across drug groups. Postoperative pain tolerance threshold changes did not correlate with preoperative clinical pain measures but were inversely related to preoperative thresholds for placebo and ketorolac but not fentanyl. CONCLUSIONS: Without analgesia, neuroplasticity after surgery was inhibitory the first 24 h and followed at 5 days by excitation. Fentanyl efficiently preempted this hyperalgesia, but hyperalgesia was greater with ketorolac than with placebo. Clinical pain measures neither reflected the different effects of ketorolac and fentanyl on postoperative neuroplasticity nor permitted prediction of postoperative neuroplasticity. The information obtained by perioperative quantitative sensory testing is separate from and additional to that from clinical pain measures and may enable more mechanism-based approaches to surgical analgesia management in the future.