Active clinical trials for "Neuralgia, Postherpetic"

The purpose of this study is to collect data on the incidence, complications and impact on quality of life of herpes zoster (HZ) disease in adults >=50 years of age in Spain. This study will also collect data on costs related to the HZ disease, especially postherpetic neuralgia (PHN)

The study aims to estimate the incidence of herpes zoster (HZ), proportion of postherpetic neuralgia (PHN) and the economic burden and impact on quality of life, in Japanese adults greater than or equal to sixty years of age.

Evolution of pain and neural injury will be evaluated at 2 years or longer after the onset of AHZ by multiple measures. Assessments at 2 years or longer will be compared to those collected during the first 6 months after HZ in order to test whether or not sensory function and cutaneous innervation continues to normalize beyond 6 months in subjects who recover from HZ without severe PHN.

The purpose of this study is to assess the burden of Herpes zoster (HZ) and post-herpetic neuralgia (PHN) among people ≥ 50 years old in France, in terms of healthcare resources used, medical direct and indirect costs, as well as pain severity and impact on quality of life.

Postherpetic neuralgia(PHN) is a chronic neuropathic pain syndrome which persists more than 3 months after the resolution of the acute shingles episode. PHN is a complicated neuropathic pain that results from the sustained peripheral injury by herpes zoster and its pathological mechanism in skin and spine has been reported. But the cerebral mechanism is still unclear. Based on the previous study that has proved the reorganization of cerebral functional connectivity in pain chronicity, the investigators hypothesize that the process from acute herpetic pain (AHP) to PHN is also accompanied with the reorganization of functional connectivity.In the study, the investigators intend to use 7 Tesla functional magnetic resonance imaging(fMRI) to observe the difference of brain activity and functional connectivity between acute herpetic pain and PHN. Meanwhile, the investigators examine the evolution of functional connectivity longitudinally in patients who is suffering from acute pain, so as to explore the central mechanism of transition to PHN.

Post herpetic neuralgia (PHN) is an undertreated condition. It is a type of neuropathic pain (NP), or pain caused by abnormal activity of sensory nerves. Its mechanisms are not fully understood, and medication trials for PHN pain and other types of NP are frequently unsuccessful. There has been extensive investigation aimed at identifying and understanding the specific mechanisms of NP. While some of these tests are inexpensive and easy to perform at the bedside, many require expensive tools and highly equipped laboratory facilities. Further, there is no standard method for assessment of pain in NP patients. The investigators aim to test a Bedside Sensory Testing Kit (assessment for Neuropathic Pain) on a small number of patients with PHN. The purpose of the Kit is to identify mechanisms of pain. The goal of this research is to design a way to classify patients with PHN based on what mechanisms are causing their pain, since this may help predict the best medications for individual patients.