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Peripheral Nerve Block in Patients With Painful Diabetic Polyneuropathy

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT04699734
Recruitment Status : Recruiting
First Posted : January 7, 2021
Last Update Posted : January 7, 2021
Information provided by (Responsible Party):
University of Aarhus

Brief Summary:
The purpose of the present study is to evaluate the role of peripheral afferent input for spontaneous pain in painful diabetic polyneuropathy

Condition or disease Intervention/treatment Phase
Painful Diabetic Neuropathy Neuropathic Pain Neuropathy;Peripheral Diagnostic Test: Xylocaine 1% Diagnostic Test: NaCl 9mg/ml Not Applicable

Detailed Description:

Both peripheral and central changes in the nervous system contribute to the development of painful diabetic neuropathy, but how these changes contribute to the pain generation remains yet to be fully understood.

The purpose of this study is to evaluate if a peripheral regional nerve block relieves spontaneous pain in painful diabetic polyneuropathy.

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 16 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double (Participant, Investigator)
Primary Purpose: Diagnostic
Official Title: Peripheral Nerve Block in Patients With Painful Diabetic Polyneuropathy: How Important is the Peripheral Signaling?
Actual Study Start Date : September 8, 2020
Estimated Primary Completion Date : December 31, 2026
Estimated Study Completion Date : December 31, 2026

Resource links provided by the National Library of Medicine

Drug Information available for: Lidocaine

Arm Intervention/treatment
Active Comparator: Xylocaine
Nerve block
Diagnostic Test: Xylocaine 1%
Nerve block

Placebo Comparator: Isotonic saline
Nerve block
Diagnostic Test: NaCl 9mg/ml
Nerve block

Primary Outcome Measures :
  1. Indication of pain relieved extremity [ Time Frame: 30 minutes ]
    Number of participants who indicated the leg with lidocaine as most pain relieved 30 minutes after block And number of participants who indicated the leg with saline as most pain relieved 30 minutes after block

Secondary Outcome Measures :
  1. Pain intensity [ Time Frame: 90 minutes ]
    Intensity of spontaneous pain (Numeric Rating Scale (NRS) 0-10, 0=no pain 10=worst pain imaginable) 30, 45, 60 and 90 minutes after block

  2. Hyperalgesia and allodynia [ Time Frame: 90 minutes ]
    Intensity of hyperalgesia and allodynia from -5 to 5 (-5 = no sensation, 0=normal sensation, 5=extremely intense sensation) to brush, pinprick, cold and warm at baseline and if there is registered any signs of hyperexcitability at baseline then 35, 60 and 90 minutes after nerve block.

  3. Pain relief [ Time Frame: 45 minutes ]
    Pain relief at 45 minutes after block assessed using a 6-point scale compared to pain intensity at baseline. (-1 = worse pain 0=no relief 1= little 2= moderate 3=good 4=complete)

  4. Pain symptomps [ Time Frame: 50 minutes ]
    Intensity of neuropathic pain symptoms 50 minutes after nerve block Burning: NRS (0-10), 0=no burning 10=worst burning imaginable Squeezing: NRS (0-10), 0=no squeezing 10=worst squeezing imaginable Pressure: NRS (0-10), 0=no pressure 10=worst pressure imaginable Tingling: NRS (0-10), 0=no tingling 10=worst tingling imaginable

  5. Distribution of evoked pain [ Time Frame: 60 minutes ]
    The distribution of any evoked pain to brush, pinprick, cold and warm before and 60 minutes after nerve block will be mapped using a filt pen and afterwards photographed.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Aged 18 years or older.
  • Probably diabetic neuropathy confirmed using the Toronto criteria in a "conservative manner", i.e. three out of three symptoms/signs of neuropathy must be present (sensory neuropathy symptoms, distal reduced sensibility, reduced ankle reflexes) 7.
  • Definite or probable neuropathic pain for minimum the last 6 months
  • Mean pain intensity at > 4 NRS the last week17.

Since we expect a large effect of the block it is not necessary to discontinue pain medication.

Exclusion Criteria:

  • Other causes of pain in the same area or other pain that cannot be distinguished from the neuropathic pain.
  • Unable to understand and speak Danish.
  • Non-cooperative.
  • Warfarin or other medication that contraindicate regional anesthesia.
  • Infection in the injection area.
  • Allergy to lidocaine.
  • Pregnancy or lactating (fertile women must to show negative pregnancy test or use anticonception).
  • Severe psychiatric disease e.g. severe depression during the last 6 months.
  • Alcohol or drug abuse.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT04699734

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Contact: Ellen L Schaldemose, MD +45 93501942

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Danish Pain Research Center, Aarhus University, Aarhus University Hospital Recruiting
Aarhus N, Jutland, Denmark, 8200
Contact: Ellen L Schaldemose, MD    93501942   
Sponsors and Collaborators
University of Aarhus
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Principal Investigator: Ellen L Schaldemose, MD Danish Pain Research Center, Aarhus University
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Responsible Party: University of Aarhus Identifier: NCT04699734    
Other Study ID Numbers: BPN2020
First Posted: January 7, 2021    Key Record Dates
Last Update Posted: January 7, 2021
Last Verified: December 2020
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Additional relevant MeSH terms:
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Peripheral Nervous System Diseases
Diabetic Neuropathies
Neuromuscular Diseases
Nervous System Diseases
Neurologic Manifestations
Diabetes Complications
Diabetes Mellitus
Endocrine System Diseases
Anesthetics, Local
Central Nervous System Depressants
Physiological Effects of Drugs
Sensory System Agents
Peripheral Nervous System Agents
Anti-Arrhythmia Agents
Voltage-Gated Sodium Channel Blockers
Sodium Channel Blockers
Membrane Transport Modulators
Molecular Mechanisms of Pharmacological Action