title: Chloroquine cardiomyopathy: beyond ocular adverse effects.
abstract: A 36-year-old woman who had received long-term treatment with chloroquine for systemic lupus erythematosus developed a third degree atrioventricular block and required a permanent pacemaker. Notably, left ventricular thickening and mild systolic dysfunction were noticed on echocardiography as well as on cardiac MRI. As there was no clear explanation for myocardial findings, the patient underwent an endomyocardial biopsy that demonstrated vacuolar degeneration of myocytes on light microscopy and curvilinear bodies on electron microscopy, both findings consistent with chloroquine toxicity. The drug was withheld and treatment with candesartan and carvedilol was prescribed. At 2-year follow-up, the patient remained asymptomatic and left ventricular systolic function had improved. Physicians who prescribe antimalarial drugs for rheumatic diseases should be aware of the potentially life-threatening effects of chloroquine on the heart.
authors.affiliation: Division of Cardiology, Hospital Pablo Tobon Uribe, Medellin, Antioquia, Colombia.
authors.forename: Nilson
authors.identifier: http://orcid.org/0000-0001-5770-2773
authors.initials: N
authors.lastname: Lopez-Ruiz
authors.affiliation: Department of Invasive Cardiology, Clinica CardioVID, Medellin, Colombia.
authors.forename: Carlos Esteban
authors.initials: CE
authors.lastname: Uribe
mesh_terms: D000328:Adult; D000962:Antimalarials / Q000009:adverse effects*; D054537:Atrioventricular Block / Q000139:chemically induced*; D009202:Cardiomyopathies / Q000139:chemically induced*; D002738:Chloroquine / Q000009:adverse effects*; D005260:Female; D006352:Heart Ventricles / Q000187:drug effects* / Q000473:pathology; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000188:drug therapy; D018487:Ventricular Dysfunction, Left / Q000209:etiology*
chemical_list: D000962:Antimalarials; D002738:Chloroquine