Active clinical trials for "Hyperalgesia"

This planned study is based on a randomized, placebo-controlled cross-over design. Palmityhlethanolamide (PEA) is an endogenous fatty acid amide from the group of N-Acetylethanolamides, which analgesic, anti-inflammatory and neuroprotective effects can be attributed to this. In clinical studies, PEA has mainly been used as an adjuvant in pain therapy. The previous data show clinical efficacy without conclusions that can be drawn about the underlying mechanisms - these have not yet been investigated in a human experiment. The planned study, which demonstrates the mode of action of PEA using an established pain model on healthy volunteers, will help to assign the efficacy to peripheral or central nervous systems. These mechanisms allow to establish mechanism-oriented therapy approaches. These findings are essential for a better understanding of the clinical efficacy and to evaluate the correct fields of application.

The aim of this randomized placebo-controlled study is to evaluate the effects of analgetics for neuropathic pain on mechanical hyperalgesia as a kind of evoked pain. Therefore the number of responders and non-responders on pregabalin will be evaluated in respect of mechanical hyperalgesia (stimulus-response-function (SRF) on static punctual stimuli evoking pain determined via pinprick). The hypothesis is that in the placebo group the amount of non-responders is increased.

Remifentanil is a potent opioid widely used during the administration of general anesthesia. There is a lot of evidence that suggest that the used of remifentanil is associated with the development of hyperalgesia (a reduction of nociceptive thresholds). However, the mechanism of this hyperalgesia is not fully understood. Recently, it was demonstrated that the disruption of the Cl- homeostasis could be involved. Interestingly, this was prevented in a murine model with the administration of Acetazolamide, a carbonic anhydrase inhibitor. In our clinical trial we will try to determine if the preoperative administration of acetazolamide could prevent the hyperalgesia induced by remifentanil in patients scheduled for thyroidectomy with general anesthesia.

The purpose of this study is to: 1. Establish whether ketamine can decrease opioid consumption and modulate the onset of opioid tolerance and prevent opioid-induced hyperalgesia in pediatric subjects, ages 10 years to 18 years, undergoing posterior spinal fusion and instrumentation.

The investigators hypothesize that propofol infusion during surgery can affect the remifentanil hyperalgesia compared to sevoflurane inhalation.The outcome will be measured by a verbal numerical rating score (VNRS) and mechanical punctuating pain by electronic von frey filament.

Opiates such as morphine are the cornerstone medications for the treatment of moderate to severe pain. Recent evidence suggests that pain patients on chronic opioid therapy become more sensitive to pain (hyperalgesia) over time. There is also a long-standing notion that analgesic tolerance to opioids (habituation) develops during chronic use even though this phenomenon has never been prospectively studied. Our specific aims propose to prospectively test the hypotheses that; 1) Pain patients on chronic opioid therapy develop dose-dependent tolerance and/or hyperalgesia to these medications over time, 2) Opioid-induced tolerance and hyperalgesia develop differently with respect to various types of pain, 3) Opioid-induced hyperalgesia occurs independently of withdrawal phenomena, and 4) Opioid-induced tolerance and hyperalgesia develop differently based on gender and/or ethnicity. This proposed study will be the first quantitative and prospective study of tolerance and hyperalgesia in pain patients and will have important implications for the rational use of opioids in the treatment of chronic pain.

This study evaluates the treatment of the symptoms of deep endometriosis with a cannabinoid derivate.

Tis study was designed to test the hypothesis that pretreatment with valdecoxib, prior to injury could reduce or prevent the development of secondary hyperalgesia around the area of primary injury. A heat/capsaicin model of induced hyperalgesia was tested in healthy volunteers in a randomized, double blind, cross-over trial of a single dose of 40 mg vadecoxib versus control. Subjects rated pain intesnsity and unpleasantness following heat stimulation of the forearm, the area of hyperalgesia was also mapped over the course of the experiment.

This study seeks to test if the study drug (voriconazole), when applied topically to a burn wound on the skin will help to reduce pain.

The study is a multi-modal multi-tissue human experimental pain study in 24 healthy volunteers. The study is a randomized cross-over study. The effect of 2 opioids will be compared on pain stimuli in skin, muscle an oesophagus. Hyperalgesia will be induced in skin and oesophagus, to sensitize these tissues. The pain thresholds before and after opioid administration will be compared. The hypothesis is that the difference in effect of the opioids is more pronounced in the presence of hyperalgesia. As hyperalgesia is a common phenomenon the clinic, the findings in this study may lead to a better understanding of the treatment of pain. The study will include an explorative study of the effect of Morphine of pain processing in the brain, this will provide us with new insight in the effect of the opioids of pain processing in the brain.