AUTHOR=Cordenier Ann , Flamez Anja , de Ravel Thomy , Gheldof Alexander , Pannone Luigi , De Asmundis Carlo , Pappaert Gudrun , Bissay Véronique TITLE=Case report: Coexistence of myotonia congenita and Brugada syndrome in one family JOURNAL=Frontiers in Neurology VOLUME=Volume 13 - 2022 YEAR=2022 URL=https://www.frontiersin.org/journals/neurology/articles/10.3389/fneur.2022.1011956 DOI=10.3389/fneur.2022.1011956 ISSN=1664-2295 ABSTRACT=

Myotonia congenita is a rare neuromuscular disorder caused by CLCN1 mutations resulting in delayed muscle relaxation. Extramuscular manifestations are not considered to be present in chloride skeletal channelopathies, although recently some cardiac manifestations have been described. We report a family with autosomal dominant myotonia congenita and Brugada syndrome. Bearing in mind the previously reported cases of cardiac arrhythmias in myotonia congenita patients, we discuss the possible involvement of the CLCN1-gene mutations in primary cardiac arrhythmia.