title: A case of flecainide-induced hyponatremia.
abstract: We present a case of flecainide-induced hyponatremia in a 67-year-old woman who was treated for paroxysmal atrial tachycardia. She developed dizziness after starting flecainide and was found to be hyponatremic with a sodium level of 122 mmol/L (decreased from 136 mmol/L). Work-up failed to reveal other causes of hyponatremia. She was not on diuretics, laxatives, or herbal medications. After discontinuation of flecainide, her symptoms and sodium levels improved. Hyponatremia is a previously unrecognized entity as an adverse effect of flecainide. We will discuss the clinical presentation, lab findings, and a possible explanation for this patient's unusual reaction to flecainide.
authors.affiliation: Electrophysiology Laboratories of Aurora Sinai/Aurora St. Luke's Medical Centers, University of Wisconsin School of Medicine and Public Health-Milwaukee Clinical Campus, Milwaukee, Wisconsin, USA.
authors.forename: Mubashir
authors.initials: M
authors.lastname: Ahmed
authors.forename: Jasbir
authors.initials: J
authors.lastname: Sra
authors.forename: Masood
authors.initials: M
authors.lastname: Akhtar
authors.forename: M Eyman
authors.initials: ME
authors.lastname: Mortada
mesh_terms: D000368:Aged; D000889:Anti-Arrhythmia Agents / Q000009:adverse effects / Q000627:therapeutic use; D001281:Atrial Fibrillation / Q000150:complications* / Q000188:drug therapy*; D005260:Female; D005424:Flecainide / Q000009:adverse effects* / Q000627:therapeutic use*; D006801:Humans; D007010:Hyponatremia / Q000139:chemically induced* / Q000175:diagnosis / Q000517:prevention & control*
chemical_list: D000889:Anti-Arrhythmia Agents; D005424:Flecainide