When ICD shocks hit like clockwork: Ventricular fibrillation induced by an atrial auto-threshold algorithm in patient with long QT syndrome type 3

Figures

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  Figure 1. Tracing showing the last arrhythmic episode experienced by the patient. The arrhythmia, most likely in the form of torsade de pointes, is marked as VF by the device and a single 36J shock is delivered, successfully terminating the tachycardia.

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  Figure 2. Tracing showing 1 self-limiting episode of premature ventricular tachycardia.

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  Figure 3. Stored electrograms showing 2 more episodes of premature ventricular tachycardia/ventricular fibrillation triggered by the activation of the atrial auto-threshold algorithm.