Is pruritus in chronic uremic patients related to peripheral somatic and autonomic neuropathy? Study by R-R interval variation test (RRIV) and by sympathetic skin response (SSR). 2001

B Zakrzewska-Pniewska, and M Jedras
Department of Neurology, Medical University of Warsaw, Banacha 1a, Str., 02097 Warsaw, Poland. beza@amwaw.edu.pl

The problem of pruritus in uremic dialysed patients remains unsolved. The etiology of pruritus has not been precisely explained, and sometimes no efficient treatment is available. The aim of this study was to analyse the relationship between somatic neuropathy and pruritus as well as the relationship between pruritus and dysautonomia. Fifty-one patients with end-stage renal failure underwent basic neurological examination, nerve conduction velocity studies, and pruritus assessment by means of a questionnaire. Two tests were used to assess the autonomic nervous system, namely the R-R interval variation test in basal and profound breath conditions (RRIV) and the sympathetic skin response (SSR). Pruritus was found in 63% patients of the sample. Most of them had clinical symptoms and signs of peripheral sensorimotor neuropathy and dysautonomia. About 59% of uremic patients revealed abnormally reduced RRIV. About 45% of patients had abnormal (delayed or absent) SSR. The pruritus in uremic patients occurred significantly more frequently (P < 0.01) in patients with paresthesia. A nonsignificant but sizeable trend towards a relationship of pruritus with hypohidrosis and pathological SSR results was also observed. There was no relationship between the pruritus presence and RRIV results. According to our results the activity of the nervous system might play an important role in the mechanism of uremic pruritus, but paradoxically this latter appeared more tightly related to somatic neuropathy than to autonomic dysfunction. Our results also suggest that SSR may become a useful technique for the assessment of autonomic dysfunction in uremic patients.

UI MeSH Term Description Entries
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D009431 Neural Conduction The propagation of the NERVE IMPULSE along the nerve away from the site of an excitation stimulus. Nerve Conduction,Conduction, Nerve,Conduction, Neural,Conductions, Nerve,Conductions, Neural,Nerve Conductions,Neural Conductions
D010523 Peripheral Nervous System Diseases Diseases of the peripheral nerves external to the brain and spinal cord, which includes diseases of the nerve roots, ganglia, plexi, autonomic nerves, sensory nerves, and motor nerves. Peripheral Nerve Diseases,Peripheral Neuropathies,PNS (Peripheral Nervous System) Diseases,PNS Diseases,Peripheral Nervous System Disease,Peripheral Nervous System Disorders,Nerve Disease, Peripheral,Nerve Diseases, Peripheral,Neuropathy, Peripheral,PNS Disease,Peripheral Nerve Disease,Peripheral Neuropathy
D011537 Pruritus An intense itching sensation that produces the urge to rub or scratch the skin to obtain relief. Itching,Pruritis
D004576 Electromyography Recording of the changes in electric potential of muscle by means of surface or needle electrodes. Electromyogram,Surface Electromyography,Electromyograms,Electromyographies,Electromyographies, Surface,Electromyography, Surface,Surface Electromyographies
D004594 Electrophysiology The study of the generation and behavior of electrical charges in living organisms particularly the nervous system and the effects of electricity on living organisms.
D005260 Female Females
D006435 Renal Dialysis Therapy for the insufficient cleansing of the BLOOD by the kidneys based on dialysis and including hemodialysis, PERITONEAL DIALYSIS, and HEMODIAFILTRATION. Dialysis, Extracorporeal,Dialysis, Renal,Extracorporeal Dialysis,Hemodialysis,Dialyses, Extracorporeal,Dialyses, Renal,Extracorporeal Dialyses,Hemodialyses,Renal Dialyses
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man

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