Case Report
Copyright ©The Author(s) 2024. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Clin Cases. Jan 26, 2024; 12(3): 587-595
Published online Jan 26, 2024. doi: 10.12998/wjcc.v12.i3.587
Special electromyographic features in a child with paramyotonia congenita: A case report and review of literature
Hui Yi, Chen-Xiang Liu, Shu-Xin Ye, Yu-Lin Liu
Hui Yi, Shu-Xin Ye, Yu-Lin Liu, Department of Neuroelectrophysiology, Qilu Children’s Hospital of Shandong University, Jinan 250000, Shandong Province, China
Chen-Xiang Liu, Department of Neuroelectrophysiology, University of Health and Rehabilitation Sciences (Qingdao Municipal Hospital), Qingdao 266000, Shandong Province, China
Author contributions: Yi H wrote the article and reviewed the relevant literature; Liu CX was involved in the translation of the paper; Ye SX presented a new theoretical perspective on this case of electromyography; and all authors reviewed and edited the article and approved the final version of the article.
Informed consent statement: Written informed consent of this paper was obtained from the patient’s legal guardian.
Conflict-of-interest statement: All the authors report no relevant conflicts of interest for this article.
CARE Checklist (2016) statement: The authors have read the CARE Checklist (2016), and the manuscript was prepared and revised according to the CARE Checklist (2016).
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: https://creativecommons.org/Licenses/by-nc/4.0/
Corresponding author: Yu-Lin Liu, MA, Deputy Director, Department of Neuroelectrophysiology, Qilu Children’s Hospital of Shandong University, No. 23976 Jingshi Road, Jinan 250000, Shandong Province, China. liuyulin1122@126.com
Received: September 21, 2023
Peer-review started: September 21, 2023
First decision: November 20, 2023
Revised: December 4, 2023
Accepted: January 4, 2024
Article in press: January 4, 2024
Published online: January 26, 2024
Core Tip

Core Tip: Paramyotonia congenita (PMC) is a rare sodium channelopathy of skeletal muscle, first identified by Eulenburg. The distinguishing feature of PMC is paradoxical myotonia, where myotonia worsens with cold and exercise. In instances where genetic testing is unavailable, electromyography (EMG) is a swift, cost-effective diagnostic and differential diagnostic method for PMC. This article elaborates on the EMG characteristics of a recently diagnosed PMC case at our hospital. In this particular case revealed the two types of myotonic discharges, and had not been documented in other studies. We underscore two distinctive features: Giant-amplitude potentials and irregular waves.