Cardiocases casebook

Boston Scientific ICD — clinical cases

P. Bordachar, M. Strik, A. Thiyagarajah, S. Ploux. Every numbered marker on an electrogram is one tap from its explanation, on a phone or a desktop.

1Counters

1Detection and treatment of a VF episode2Detection and treatment of a VT episode3Non-sustained ventricular tachycardia4Change of detection zone5Spontaneous termination and shock diversion6Diversion window at end of a charge7Undersensing and charge diversion8End-of-episode criteria following an electric shock

2Therapies

1VF episode correctly detected and treated with maximum output shock2VF episode with low-amplitude shock in a child3Multiple electric shocks in the VF zone4VT in the VF zone and high defibrillation threshold5VF, device shock with AF induction6ATP burst in the VF zone7ATP burst in the VF zone with acceleration8Undersensing, rate calculation error and ATP burst in the VF zone9Oversensing and anti-tachycardia pacing in the VF zone10Anti-tachycardia pacing in the VT zone11Anti-tachycardia pacing in the VT zone and post-detection duration12Progression of therapies in the VT zone13Low-amplitude shock and acceleration of arrhythmia14Maximum output shock in the VT zone15Anti-tachycardia pacing in the VT zone with acceleration into the VF zone

3Discrimination

1Single-chamber discrimination, Rhythm ID and a ventricular tachycardia episode2Single-chamber discrimination, Rhythm ID and an atrial fibrillation episode3Single-chamber discrimination, Rhythm ID and sinus tachycardia4Single-chamber discrimination, Rhythm ID and correlation percentage5Single-chamber discrimination, Rhythm ID and SRD6Dual chamber discrimination and V>A7Dual-chamber discrimination, atrial refractory periods and V>A criterion8Dual-chamber discrimination and tachycardia9Dual-chamber discrimination and atrial tachycardia10Dual-chamber discrimination and dual tachycardia11Dual-chamber discrimination and AF with aberrant conduction12Dual-chamber discrimination and discrimination error due to signal variability on the shock channel13Dual-chamber discrimination and discrimination error due to inappropriate programming of the correlation percentage14Dual-chamber discrimination, atrial tachycardia15Dual-chamber discrimination and atrial fibrillation16Dual chamber discrimination, atrial tachycardia

4Oversensing

1Oversensing of electrocautery2Surgical intervention and VF at the time of reperfusion3Inappropriate therapies during a TAVI procedure4Lead fracture and multiple capacitor charges5Oversensing of the P wave by the defibrillation lead6Oversensing of atrial activity by the defibrillation lead during an episode of atrial arrhythmia7Early displacement of a right ventricular lead into the atrium8T wave oversensing9Oversensing of diaphragmatic myopotentials

From Boston Scientific ICD — clinical cases by P. Bordachar, M. Strik, A. Thiyagarajah, S. Ploux. Published by Cardiocases. Every numbered marker on a recording is explained in the list beneath it; tap a marker on the trace or an entry in the list.

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