Small-Fiber Neuropathy | Small-fiber Neuropathy in Chronic Kidney Disease
Small-Fiber Neuropathy research study
What is the primary objective of this study?
Neurological dysfunction is a common complication of late stage chronic kidney disease (CKD) and peripheral nerve system is often involved in such complication. Sensory disturbances such as paresthesia and hypoesthesia are the predominant symptoms in uremic polyneuropathy and it is traditionally thought the uremic polyneuropathy mainly involve large-diameter sensory nerves. However in uremic patients the abnormal thermal thresholds, the sensory symptoms like numbness, burning, paradoxical heat, cold or freezing, and pain, and the frequent symptoms of autonomic dysfunction suggest that small-fiber neuropathy should be a clinical entity in patients of CKD. But there are still few investigations with emphasis on the changes of small-fiber nerves in CKD, and little is known about the characteristics and mechanism of small-fiber neuropathy in CKD. Skin biopsy with evaluation of epidermal nerve density and the morphology of epidermal nerves and the subepidermal nerve plexus is an effective and minimally invasive test for assessment of small-fiber neuropathy. Contact heat evoked potential (CHEP) recording the brain responses evoked by contact heat stimuli on the skin is a non-invasive technique to investigate the thermo-nociceptive pathways mediated by small-fiber nerves. In the current study, we will use an integrated approach by combining the skin biopsy, quantitative sensory testing, autonomic function tests, and CHEP to investigate the pathological, psychophysical and physiological aspects of small-fiber neuropathy in patients of CKD. The aims of the current study is to address the following issues: (1) the changes of small fiber nerves in uremia and CKD of different stage; (2) the correlation of skin innervation with clinical manifestations, thermal thresholds, and autonomic function; (3) the influence of dialysis therapy, the type of dialysis therapy, or renal transplantation on the small fiber neuropathy in uremia; (4) the roles of blood chemical substances, metals, and endocrine profiles on the development of small-fiber neuropathy; (5) the relationship between the small-fiber neuropathy and pruritus or restless leg syndrome; and (6) the pathological and physiological correlates of painful symptoms by skin biopsy and CHEP in CKD related neuropathy. The results of the study will provide important insights in the understanding of the pathogenesis, and the prevention and new treatments of small-fiber neuropathy in CKD.
Who is eligible to participate?
Inclusion Criteria: - The patients should fulfill the criteria of CKD according to renal function study and the patients of end-stage renal disease should receive regular dialysis therapy and follow-up at outpatient clinics. - For disease comparison, patients with peripheral neuropathy of variable etiologies will also be recruited. Exclusion Criteria: - Poor control DM, - Severe heart failure, - Bleeding tendency, - Severe lung disease with respiratory distress, - Severe infection, - Alcoholism, - Amyloidosis, - Poor wound healing history.
Which medical condition, disease, disorder, syndrome, illness, or injury is researched?
Chronic Kidney Disease
Interventions can include giving participants drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available or noninvasive approaches such as surveys, education, and interviews.
Other:Skin biopsyA 3-mm-diameter skin biopsy punch was taken at the lateral side of the distal leg and fixed in 4% paraformaldehyde overnight. Sections of 50 m perpendicular to the dermis were cut on a sliding microtome, quenched with 1% H2O2 in methanol, and blocked with 5% normal goat serum. Sections were incubated with rabbit antiserum to protein gene product 9.5 (PGP 9.5, UltraClone, Isle of Wight, UK, 1:1000) overnight. PGP 9.5 is a ubiquitin carboxyl hydrolase, which labels myelinated and unmyelinated nerve fibers in the peripheral nervous system. Sections were then incubated with biotinylated goat anti-rabbit immunoglobulin G (Vector, Burlingame, CA) for 1 h and the avidin-biotin complex (Vector) for another hour. The reaction product was demonstrated using chromogen SG (Vector).
Research studies and clinical trials typically have two or more research arms. An arm is a group of people who receive the same treatment in the study.
Start Date: February 2009
Primary Outcome: The pathology of skin biopsy
Secondary Outcome: Function of small-fiber sensory nerve
Study sponsors, principal investigator, and references
Principal Investigator: Sung-Tsang Hsieh
Lead Sponsor: National Taiwan University Hospital