DOLORisk: Research on Risk Factors and Determinants for Neuropathic Pain

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

1550 participants

Study Classification

OBSERVATIONAL

Study Start Date

2015-06-30

Study Completion Date

2019-06-30

Brief Summary

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Patients with neuropathic pain of multiple etiologies and a control cohort of patients with the same neuropathic entities who did not develop neuropathic pain are examined clinically, phenotyped with QST and questionnaires. Both groups are analyzed in order to find risk factors for painful neuropathy.

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Detailed Description

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Patients with probable (presence of a combination of symptoms and signs of neuropathy include any two or more of the following: neuropathic symptoms, decreased distal sensation, or unequivocally decreased or absent ankle reflexes) or confirmed (presence of an abnormality of NC or validated measure of small fiber neuropathy with class 1 evidence with corresponding symptoms) neuropathy are included. Patients are then further divided into those with painful and painless neuropathy according to the NeuPSIG algorithm. Patients with probable or definite neuropathic pain are classified as painful neuropathy, those with unlikely neuropathic pain classified as painless neuropathy (with concomitant nociceptive pain of other origin, e.g. headache etc.). Patients with possible neuropathic pain are excluded from analysis as are patients with skin lesions or dermatological disorders in the areas to be tested upon QST, with any painful or neurological comorbidity that could otherwise influence testing results such as vascular disease, radiculopathy, spinal canal stenosis etc. Inclusion was restricted to patients with polyneuropathy to make the investigated patient sample as homogenous as possible.

Age, gender, BMI, ethnicity, years in education, family history of chronic pain, etiology of neuropathy, presence of early traumatic events and hospital admissions, smoking and alcohol habits, pain characteristics (von Korff, BPSI, NPSI), emotional well-being (PROMIS depression/ anxiety), personality (TIPI, IPIP, PCS), severity of neuropathy are assessed and QST performed.

Conditions

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Neuropathic Pain

Study Design

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Observational Model Type

COHORT

Study Time Perspective

CROSS_SECTIONAL

Study Groups

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Painful neuropathy

Patients with presence of probable (presence of a combination of symptoms and signs of neuropathy include any two or more of the following: neuropathic symptoms, decreased distal sensation, or unequivocally decreased or absent ankle reflexes) or confirmed (presence of an abnormality of NC or validated measure of small fiber neuropathy with class 1 evidence with corresponding symptoms) neuropathy AND with probable or definite neuropathic pain according to the NeuPSIG algorithm.

Quantitative sensory testing (QST)

Intervention Type DIAGNOSTIC_TEST

Demographic data, pain characteristics, health status, emotional well-being, personality and lifestyle are assessed by questionnaires. Additionally, all patients underwent a clinical neurological examination and quantitative sensory testing (QST) according to the German Research Network on Neuropathic Pain (DFNS).

Painless neuropathy

Patients with presence of probable (presence of a combination of symptoms and signs of neuropathy include any two or more of the following: neuropathic symptoms, decreased distal sensation, or unequivocally decreased or absent ankle reflexes) or confirmed (presence of an abnormality of NC or validated measure of small fiber neuropathy with class 1 evidence with corresponding symptoms) neuropathy AND with unlikely neuropathic pain according to the NeuPSIG algorithm.

Quantitative sensory testing (QST)

Intervention Type DIAGNOSTIC_TEST

Demographic data, pain characteristics, health status, emotional well-being, personality and lifestyle are assessed by questionnaires. Additionally, all patients underwent a clinical neurological examination and quantitative sensory testing (QST) according to the German Research Network on Neuropathic Pain (DFNS).

Interventions

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Quantitative sensory testing (QST)

Demographic data, pain characteristics, health status, emotional well-being, personality and lifestyle are assessed by questionnaires. Additionally, all patients underwent a clinical neurological examination and quantitative sensory testing (QST) according to the German Research Network on Neuropathic Pain (DFNS).

Intervention Type DIAGNOSTIC_TEST

Other Intervention Names

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Different Questionnaires

Eligibility Criteria

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Inclusion Criteria

\- Diagnosis of Polyneuropathy

Exclusion Criteria

* Patients with polyneuropathy and possible neuropathic pain
* Patients with skin lesions or dermatological disorders in the areas to be tested upon QST
* Patients with any painful or neurological comorbidity that could otherwise influence testing results such as vascular disease, radiculopathy, spinal canal stenosis etc.

Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No