This 56 year-old man with remote myocardial infarction and history of ventricular tachycardia presents to the implantable cardioverter defibrillator (ICD) clinic with a recent shock from his device. One of the electrograms from device interrogation is shown below:

• Inappropriate Anti-Tachycardia Pacing for Atrial Tachycardia
• Induction of Ventricular Tachycardia with Anti-Tachycardia Pacing

The electrograms for the remainder of the episode is shown below:

• ICD Shock for Ventricular Tachycardia
• Shock terminates both ventricular tachycardia and atrial tachycardia
• Resumption of Paced Rhythm after Shock