Active clinical trials for "Hyperalgesia"

Treatment of chronic pain is a major clinical challenge since chronic pain is frequent and leads to deterioration of quality of life. An injury or wound can lead to long term changes in the nervous system that make the skin more sensitive at and near the injury; this is termed hyperalgesia and occurs through long term depotentiation (LTP), i.e., a change in the synaptic interaction between neurons. Opioids are the gold standard for the symptomatic therapy of moderate to severe pain. Now, in animal studies the investigators have discovered previously unrecognized effects of opioids. UV-B irradaition of the skin of the thigh is an established model of priamary and secondary hyperalgeisa in humans. The investigators want to test the influence of remifentanil, an ultra-short acting opioid, on hyperalgesia observed after UV-B irradiation in human volunteers in a double blind cross-over prospective active placebo controlled clinical trial.

Treatment of chronic pain is a major clinical challenge since chronic pain is frequent and leads to deterioration of quality of life. An injury or wound can lead to long term changes in the nervous system that make the skin more sensitive at and near the injury; this is termed hyperalgesia and occurs through long term depotentiation (LTP), i.e., a change in the synaptic interaction between neurons. Opioids are the gold standard for the symptomatic therapy of moderate to severe pain. Now, in animal studies the investigators have discovered previously unrecognized effects of opioids. UV-B irradaition of the skin of the thigh is an established model of priamary and secondary hyperalgeisa in humans. The investigators want to test the influence of remifentanil, an ultra-short acting opioid, on hyperalgesia observed after UV-B irradiation in human volunteers in a double blind cross-over prospective active placebo controlled clinical trial, at a dose corresponding to 0.7 µg kg-1 min-1.

Treatment of chronic pain is a major clinical challenge since chronic pain is frequent and leads to deterioration of quality of life. An injury or wound can lead to long term changes in the nervous system that make the skin more sensitive at and near the injury; this is termed hyperalgesia and occurs through long term depotentiation (LTP), i.e., a change in the synaptic interaction between neurons. Opioids are the gold standard for the symptomatic therapy of moderate to severe pain. Now, in animal studies the investigators have discovered previously unrecognized effects of opioids. Intradermal injection of capsaicin (injection of pepper extract into the skin) is an established pain model in humans. The investigators want to test the influence of remifentanil, an ultra-short acting opioid, on hyperalgesia observed after intradermal capsaicin in human volunteers in a double blind cross-over prospective active placebo controlled clinical trial.

Treatment of chronic pain is a major clinical challenge since chronic pain is frequent and leads to deterioration of quality of life. An injury or wound can lead to long term changes in the nervous system that make the skin more sensitive at and near the injury; this is termed hyperalgesia and occurs through long term depotentiation (LTP), i.e., a change in the synaptic interaction between neurons. Opioids are the gold standard for the symptomatic therapy of moderate to severe pain. Now, in animal studies the investigators have discovered previously unrecognized effects of opioids. Intradermal injection of capsaicin (injection of pepper extract into the skin) is an established pain model in humans. The investigators want to test the influence of remifentanil, an ultra-short acting opioid, on hyperalgesia observed after intradermal capsaicin in human volunteers in a double blind cross-over prospective active placebo controlled clinical trial.

The primary aim is to determine whether perioperative NMDA-receptor antagonism has differential effects on postoperative pain, hyperalgesia and morbidity in younger and older patients. In order to achieve this aim, the researchers propose to conduct the first randomized, double-blind placebo-controlled study designed to investigate age differences in the effects of perioperative oral administration of an NMDA-receptor antagonist (amantadine) in men undergoing radical prostatectomy. In addition, age differences in psychosocial factors and the pharmacological properties of amantadine and morphine will be measured to control for, and clarify, their contribution to the differences found. The specific objectives of the study are to: investigate the effects of perioperative NMDA receptor blockade on postoperative hyperalgesia, pain and analgesic consumption in young and elderly men assess age differences in the intensity and course of secondary hyperalgesia after surgery

The purpose of this study is to investigate responses of pain and the maintenance of mechanical muscle hypersensitivity following an acute exercise-induced ischemic condition repeated over time in a prolonged NGF-sensitized muscle. Additionally, the influence of the pain modulating system on prolonged NGF muscle hypersensitivity caused by peripheral mechanisms and central mechanisms will also be investigated.

Despite the pathophysiology of IBS remains largely unsettled, several mechanisms have been proposed to explain symptom generation. These include psychosocial factors, altered gastrointestinal motor function and altered perception of visceral stimuli because of chronic low-grade inflammation and increased nociceptive mediator release by inflammatory cells, particularly mast cells. The aim of this pilot study is to provide evidence of: intestinal mast cell (MC) infiltration and activation in IBS patients; down-modulation of MC activation by the oral administration of the association of palmitoylethanolamide (PEA) and polydatin in IBS patients.

American Society of Anaesthesiologist physical status (ASA) I-III 105 patients who undergoing major abdominal surgery in obstetric and gynaecology clinic were recruited to this study. Patients were randomized into the 3 groups. Lumbar epidural catheter will be inserted to the all patients. After than anaesthesia induction will provide with 2 mg/kg propofol and 0.6 mg/kg rocuronium. Desflurane and azot protoxit (N2O)-O2 will use for anaesthesia maintenance. During surgical operation, 0.3 microgram/kg/h remifentanil infusion will continuous till the end of surgery. In group I, 2 ml serum physiologic (0.9 NaCL)will apply from epidural catheter before surgical incision. In group II, 1 mg morphine will apply from epidural catheter before surgical incision. In group III, 1 mg morphine will apply from epidural catheter at the time point of peritoneum is closed. Epidural patient controlled analgesia will provide with bupivacaine for postoperative analgesia. Postoperative pain will be assessed with numerical pain scale. Postoperative analgesic requirement will be calculated. Hyperalgesia will detect with algometer and von Frey ligaments.

One out of 10 patients undergoing surgery develops persistent post-surgical pain (PPSP). Unfortunately, available therapies for treating this pain have limited success. It is therefore of great importance to find strategies to prevent PPSP. The goal of this project is to find new screening tools that identify patients that are at risk for developing PPSP. Tissue injury and inflammation following surgery increase the excitability of spinal nociceptive neurons ("central sensitisation", CS) with pain hypersensitivity as consequence. It is thought that CS plays an important role in persistent pain. The first objective of this project is to assess in human patients if the propensity to develop CS manifested as secondary hyperalgesia before surgery is predictive for PPSP. In addition, we will test if the frequency content of the resting-state EEG reflecting the initial state of the brain will be related to the propensity for developing CS and to the presence of PPSP at two months after surgery.

Sensory disturbances in persistent postherniotomy pain, include hyperalgesia from deeper structures as well as the skin. Whether this is one combined pain syndrome, where for instance deep pain leads to cutaneous hyperalgesia, or two isolated synchronous pain conditions, is unknown. By Giving pain free subjects an intense non-harmful electrical stimulation in deeper tissues in the groin and recording the skin sensory function, this hypothesis will be tested