A case of long QT syndrome type 3 aggravated by beta-blockers and alleviated by mexiletine: The role of epinephrine provocation test

Junbeom Park, Sook Kyoung Kim, Hui Nam Pak

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Long QT syndrome (LQTs) is an uncommon genetic disease causing sudden cardiac death with Torsade de Pointes (TdP). The first line drug treatment has been known to be β-blocker. We encountered a 15-year-old female student with LQTs who had prolonged QTc and multiple episodes of syncope or agonal respiration during sleep. Although her T wave morphology in surface electrocardiography resembled LQTs type 1, her clinical presentation was unusual. During the epinephrine test, TdP was aggravated during β-blocker medication, but alleviated by sodium channel blocker (mexiletine). Therefore, she underwent implantable cardioverter defibrillator implantation.

Original languageEnglish
Pages (from-to)529-533
Number of pages5
JournalYonsei Medical Journal
Volume54
Issue number2
DOIs
StatePublished - Mar 2013

Keywords

  • β-blocker
  • Long QT syndrome type 3
  • Mexiletine
  • SCN5A
  • Torsade de pointes

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