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Open Access 01-12-2015 | Review

Primary erythromelalgia: a review

Authors: Zhaoli Tang, Zhao Chen, Beisha Tang, Hong Jiang

Published in: Orphanet Journal of Rare Diseases | Issue 1/2015

Abstract

Primary erythromelalgia (PE ORPHA90026) is a rare autosomal dominant neuropathy characterized by the combination of recurrent burning pain, warmth and redness of the extremities. The incidence rate of PE ranges from 0.36 to 1.1 per 100,000 persons. Gender ratio differs according to different studies and no evidence showed a gender preference. Clinical onset of PE is often in the first decade of life. Burning pain is the most predominant symptom and is usually caused and precipitated by warmth and physical activities. Reported cases of PE contain both inherited and sporadic forms. Genetic etiology of PE is mutations on SCN9A, the encoding gene of a voltage-gated sodium channel subtype Nav1.7. Diagnosis of PE is made upon clinical manifestations and screening for mutations on SCN9A. Exclusion of several other treatable diseases/secondary erythromelalgia is also necessary because of the lack of biomarkers specifically for PE. Differential diagnoses can include Fabry disease, cellulites, Raynaud phenomenon, vasculitis and so on. Diagnostic methods often involve complete blood count, imaging studies and thermograph. Treatment for PE is unsatisfactory and highly individualized. Frequently used pain relieving drugs involve sodium channel blockers such as lidocaine, carbamazepine and mexiletine. Novel drugs such as PF-05089771 and TV-45070 could be promising in ameliorating pain symptoms due to their Nav1.7 selectivity. Patients’ symptoms often worsen over time and many patients develop ulcerations and gangrenes caused by excessive exposure to low temperature in order to relieve pain. This review mainly focuses on PE and the causative gene SCN9A -- its mutations and their effects on Nav1.7 channels’ electrophysiological properties. We propose a genotype-channelopathy-phenotype correlation network underlying PE etiology which could provide guidance for future therapeutics.

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Title: Primary erythromelalgia: a review
Authors: Zhaoli Tang
Zhao Chen
Beisha Tang
Hong Jiang
Publication date: 01-12-2015
Publisher: BioMed Central
Published in: Orphanet Journal of Rare Diseases / Issue 1/2015
Electronic ISSN: 1750-1172
DOI: https://doi.org/10.1186/s13023-015-0347-1

At a glance: The STEP trials

Springer Medicine

Primary erythromelalgia: a review

Abstract

At a glance: The STEP trials

Springer Medicine

Abstract

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