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Extracardiac signals

Intracardiac signals

Figure 5.2. The first step in the analysis of stored electrograms.

Figure 5.3. Oversensing of intracardiac signals which can result in inappropriate detection of ventricular tachyarrhythmias. Panel A shows R-wave double counting during monomorphic ventricular tachycardia. B shows oversensing of R-wave on the atrial bipolar electrogram (far-field R-wave oversensing). C shows T-wave oversensing on the ventricular bipolar electrogram. D shows electromagnetic interference on the atrial and ventricular electrogram. HV: (high voltage) far-field ventricular electrogram; RA = right atrial electrogram; RV: near-field ventricular electrogram.

Figure 5.3. Oversensing of intracardiac signals which can result in inappropriate detection of ventricular tachyarrhythmias. Panel A shows R-wave double counting during monomorphic ventricular tachycardia. B shows oversensing of R-wave on the atrial bipolar electrogram (far-field R-wave oversensing). C shows T-wave oversensing on the ventricular bipolar electrogram. D shows electromagnetic interference on the atrial and ventricular electrogram. HV: (high voltage) far-field ventricular electrogram; RA = right atrial electrogram; RV: near-field ventricular electrogram.

Figure 5.4. Assessment of the onset of tachyarrhythmia. From top to bottom: A = atrial electrogram; RV = near-field ventricular electrogram; HV = (high voltage) far-field ventricular electrogram; M = marker channel. Markers: AR = atrial refractory sense; AS = atrial sense; TS = tachycardia sense; VS = ventricular sense.

Figure 5.4. Assessment of the onset of tachyarrhythmia. From top to bottom: A = atrial electrogram; RV = near-field ventricular electrogram; HV = (high voltage) far-field ventricular electrogram; M = marker channel. Markers: AR = atrial refractory sense; AS = atrial sense; TS = tachycardia sense; VS = ventricular sense.

Stored Electrograms in Single-chamber Devices

Figure 5.5. Approach for analysis of stored electrograms in single-chamber devices. * aberrancy cannot be excluded

Stored Electrograms in Dual-chamber Devices

Figure 5.6. AA: atrial intervals; AF: atrial fibrillation; AFL: atrial flutter; AV: atrio-ventricular; SVT: supraventricular tachycardia; VA: ventriculo-atrial; VT: ventricular tachycardia; VV: ventricular intervals.

Clinical Case Studies

Early Devices

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