Abstract:
:Quinolone antibiotics have potentially serious proarrhythmic effects. The effects on intracardiac potassium channels result in QT interval prolongation, leading to torsades de pointes. Evidence suggests fluoroquinolones cause QT-mediated proarrhythmia, and weak evidence links ciprofloxacin with QT-mediated arrhythmias. Ciprofloxacin may be given to select patients because the agent is believed to be safer than other drugs in its class. We report two cases of unexplained cardiac arrest temporally related to ciprofloxacin administration. Two female patients (ages 44 and 67 years) developed marked QTc prolongation (QTc 590 and 680 ms) within 24 hours of ciprofloxacin administration, with recurrent syncope and documented torsades de pointes requiring defibrillation. The patients previously were stable with sotalol and amiodarone therapy for supraventricular arrhythmia without obvious QTc prolongation prior to ciprofloxacin therapy. Marked QTc prolongation and subsequent proarrhythmia became a clinical concern only after initiation of ciprofloxacin. In both cases, the QTc normalized after cessation of ciprofloxacin. Ciprofloxacin may cause QTc prolongation and rarely torsades de pointes. This effect is of particular concern in patients with predisposing factors, such as concomitant medications or underlying heart disease reflecting decreased repolarization reserve.
journal_name
Heart Rhythmjournal_title
Heart rhythmauthors
Prabhakar M,Krahn ADdoi
10.1016/j.hrthm.2004.06.020keywords:
subject
Has Abstractpub_date
2004-11-01 00:00:00pages
624-6issue
5eissn
1547-5271issn
1556-3871pii
S1547-5271(04)00417-5journal_volume
1pub_type
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