Evaluation of Neuropathic Pain in the Context of Clinical Symptoms, Quantitative Sensory Tests and Imaging With FMRI

Ege University

Status: Completed

Conditions: Neuropathic Pain; Radiculopathy, Cervical

Treatments: Diagnostic Test: Functional MRI

Study type: Observational

Funder types: Other

Identifiers

NCT03890315

QST-FMRI

Details and patient eligibility

About

This study is planned to evaluate patients with upper extremity neuropathic pain due to cervical radiculopathy with clinical symptoms, Quantitative Sensory Testing(QST) and Functional Magnetic Resonance Imaging(fMRI). Patients with similar charactheristics will be grouped and comparisons will be conducted in fMRI results, as well as QST.

Full description

Neuropathic pain is a type of pain which usually accompanies injuries or conduction defects in the central or peripheral nervous system, as well as receptors. Unlike the other types of pain, neuropathic ones are more resistant to therapy and prone to be chronic.

In recent years, there are many novel techiques to assess the neurological status and create standardized test protocols. One of these techiques is QST(Quantitative Sensory Testing). QST is a specific type of sensory examination, usually done through computerized stimuli of heat, cold or vibration, or specific test equipment. There are many types of QST protocols around the world, and their results can also be expressed as phenotypes through statistics. While there are 3 types of pain phenotypes with the 13 item QST protocol suggested by German Neuropathic Pain Research group(DFNS), all patient groups can be classified differently as well, according to the common findings they express. These different phenotypes are also shown to have different responses to the different pain treatments. Such differences are usually attributed to the different mechanisms and fibers underlying the pathogenesis.

While patients show differences in QST results, evidence for the correlation between these variables and clinical symptoms of the patients are still scarce. Moreover, it is still yet to be known if these differences have a central origin as well as the peripheral mechanisms.

Functional Magnetic Resonance Imaging(fMRI) is a method to evaluate cerebral functions. It is mainly based on the blood flow changes that occur locally in regions that are in function[5]. As a result of the increased blood flow, the oxygen concentration also increases, creating a signal response called BOLD(Blood Oxygen Level Dependent) response. Since different types of pain are conducted through different fibers and pathways, it is also probable that they might show changes in cortical response as well.

In this study, the aim is to find whether QST results are correlated to clinical symptoms and pain properties of the patients, and these changes are related to the changes in the central nervous system

Enrollment: 40 patients

Sex: All

Ages: 18 to 70 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

Adult patients with upper extremity neuropathic pain due to radiculopathy Duration of >1 month Unilateral extremity pain

Exclusion criteria

• Severe cognitive impairment
• Unstable systemic comorbidity
• Presence of pacemaker or deep brain stimulation
• Implants that aren't compatible with MRI
• Claustrophobia
• Complete or near complete loss of sensation
• Brain injury or presence intracranial lesions

Trial design

40 participants in 2 patient groups

Neuropathic pain

Description:

Adult patients with upper extremity neuropathic pain due to radiculopathy Duration of \>1 month Unilateral extremity pain will be recruited

Treatment:

Diagnostic Test: Functional MRI

Control

Description:

Age and gender matched control patients will also be recruited to show whether differences exist in outcome measures.

Treatment:

Diagnostic Test: Functional MRI