AUTHOR=Lazzerini Pietro Enea , Capecchi Pier Leopoldo , Bertolozzi Iacopo , Morozzi Gabriella , Lorenzini Sauro , Simpatico Antonella , Selvi Enrico , Bacarelli Maria Romana , Acampa Maurizio , Lazaro Deana , El-Sherif Nabil , Boutjdir Mohamed , Laghi-Pasini Franco TITLE=Marked QTc Prolongation and Torsades de pointes in Patients with Chronic Inflammatory Arthritis JOURNAL=Frontiers in Cardiovascular Medicine VOLUME=3 YEAR=2016 URL=https://www.frontiersin.org/journals/cardiovascular-medicine/articles/10.3389/fcvm.2016.00031 DOI=10.3389/fcvm.2016.00031 ISSN=2297-055X ABSTRACT=

Mounting evidence indicates that in chronic inflammatory arthritis (CIA), QTc prolongation is frequent and correlates with systemic inflammatory activation. Notably, basic studies demonstrated that inflammatory cytokines induce profound changes in potassium and calcium channels resulting in a prolonging effect on cardiomyocyte action potential duration, thus on the QT interval on the electrocardiogram. Moreover, it has been demonstrated that in rheumatoid arthritis (RA) patients, the risk of sudden cardiac death is significantly increased when compared to non-RA subjects. Conversely, to date no data are available about torsades de pointes (TdP) prevalence in CIA, and the few cases reported considered CIA only an incidental concomitant disease, not contributing factor to TdP development. We report three patients with active CIA developing marked QTc prolongation, in two cases complicated with TdP degenerating to cardiac arrest. In these patients, a blood sample was obtained within 24 h from TdP/marked QTc prolongation occurrence, and levels of IL-6, TNFα, and IL-1 were evaluated. In all three cases, IL-6 was markedly elevated, ~10 to 100 times more than reference values. Moreover, one patient also showed high circulating levels of TNFα and IL-1. In conclusion, active CIA may represent a currently overlooked QT-prolonging risk factor, potentially contributing in the presence of other “classical” risk factors to TdP occurrence. In particular, a relevant role may be played by elevated circulating IL-6 levels via direct electrophysiological effects on the heart. This fact should be carefully kept in mind, particularly when recognizable risk factors are already present and/or the addition of QT-prolonging drugs is required.