View clinical trials related to Hyperalgesia.
Filter by:This study aims to determine whether MK-8291 is effective in reducing pain in participants with post-herpetic neuralgia (PHN) with allodynia. The primary hypothesis is that when compared to placebo, treatment with MK-8291 reduces the change from Baseline in participant-reported pain intensity by 1 on an 11-point numeric rating scale.
Burn-related pain is severe and often difficult to manage. Healthcare workers struggle with keeping burn patients comfortable, especially when these patients undergo dressing changes of their burn wounds of their skin since these procedures often cause severe pain. Patients with burn wounds frequently require high doses of opioids (narcotics) and calming (anxiolytic) agents to the extent that clinicians must weigh the risks associated with these doses against achieving adequate analgesia and comfort. The biggest risk is over-sedation to cause breathing troubles. Inadequate pain control during these procedures heightens pain perception, anxiety, and fear surrounding the experience and may lead to patients experiencing additional psychological disorders like depression, acute stress disorder (ASD), and post-traumatic stress disorder (PTSD). Therefore, therapeutic options for better management of pain and anxiety during these procedures need to be identified. This study will address whether the addition of ketamine during dressing changes improves patients' pain control and comfort and whether this leads to favorable psychological outcomes. The study is designed to compare ketamine with placebo when they are added to usual care (opioids and anxiolytics) during dressing changes. The main outcomes of the study will be the amount of opioid and anxiolytic agents each group receives during their procedure; the presence of pain-related anxiety shortly after the procedures; blood markers of stress during the procedures; and the presence of depression, anxiety and stress disorders prior to discharge. This study will assess whether the early administration of ketamine reduces pain and anxiety to prevent the need for high doses of opioids and anxiolytics. A total of 30 patients will be enrolled.
Assessments of mechanical skin sensitivity include psychophysical responses to stimulation with calibrated polyamide monofilaments. One of the applications of polyamide monofilaments are the assessments of magnitude of secondary hyperalgesia areas (SHAs), i.e. areas in normal skin near an injury with increased mechanical sensitivity. The objective of the study is to investigate the hypothesis, based on previous studies, that a light tactile stimulus delineates a larger SHA than stimulation with a more rigid monofilament. Twenty-three healthy participants were included in this randomized, two-observer, test-retest study. A highly significant positive correlation between the bending force of the polyamide filaments and the magnitude of SHA was demonstrated. The "weighted-pin" instrument showed significantly and consistently larger areas than the polyamide monofilaments. The hypothesis was rejected: a light tactile stimulus did not delineate a larger secondary hyperalgesia area than stimulation with a more rigid monofilament. The "weighted-pin" instrument seems an alternative to the conventional polyamide monofilaments.
Despite improvements in analgesic treatment following total knee arthroplasty (TKA) for osteoarthrosis, a substantial part of patients still have severe acute pain after surgery. It has been suggested that preoperative degree of intraarticular inflammation is associated to postoperative degree of pain and level of function. Furthermore it is known, that patients with preoperative inflammation have hyperalgesia and severe movement related pain. The aim of this study is to investigate the effect of a preoperative intraarticular injection of Methylprednisoloneacetate in reducing acute postoperative pain after total knee arthroplasty in patients with signs of severe pre-operative inflammation and pain.
The purpose of this study is to examine whether two clinically sensible dose regimen of fentanyl (low dose vs. high dose) lead to different pain scores as measured by the nonverbal rating scale (NRS) in healthy volunteers at 4.5 to 6.5 hours after fentanyl application. Pain modalities tested will include transdermal electrical stimulation and cold pressor pain. The investigators hypothesize that the high dose fentanyl group will have an increase of approximately 20% in the NRS.
Postoperative hyperalgesia has been reported after intraoperative administration of small or high-dose remifentanil. Cyclooxygenase inhibitor exhibit preventive effects on the development of opioid-induced hyperalgesia. The aim of this study is to evaluate the preventive effect of intravenous ibuprofen (Caldolor®) on remifentanil-induced hyperalgesia
This randomized, placebo-controlled, double-blind 4x4 crossover clinical trial was part of a larger NIH-funded study to evaluate the analgesic efficacy of multiple dose-combinations of chronic oral (PO) dextromethorphan and intravenous (IV) lidocaine in central neuropathic pain following spinal cord injury.
Combination of guanfacine with opioid medication as a standard treatment for chronic pain.
In this prospective trial we aim to investigate the intra-individual and inter-individual variance in secondary hyperalgesia following pain elicited by the experimental pain model: Brief Thermal Sensitization. Furthermore we wish to investigate how precise the psychological tests, Pain Catastrophizing Scale and Hospital Anxiety and Depression Scale predict the size of the area of secondary hyperalgesia.
Intraepidermal injection of nerve growth factor results in a non-inflammatory hyperalgesia for thermal and mechanical stimuli. This hyperalgesia is similar to the pathological ailments of patients with neuropathic pain. The mechanisms of the cognitive modulation of pain and hyperalgesia are not yet understood in this group of patients. The investigators plan to use NGF injection as a model of non-inflammatory neuropathic pain in healthy subjects to investigate the underlying neuronal mechanisms of this hyperalgesia using functional magnetic resonance imaging and resting state network analysis.