Deceptive intracardiac electrograms during an ICD interrogation. A clinical challenge

Area of Science:

• Cardiology
• Electrophysiology
• Cardiac Surgery

Background:

• Patients with structural heart disease often have complex cardiac histories, including prior surgeries.
• Intra-atrial conduction delays are common in this population.
• Accurate interpretation of cardiac electrograms is crucial for patient management.

Purpose of the Study:

• To highlight the significance of intra-atrial conduction delays in patients with structural heart disease.
• To discuss potential pitfalls in interpreting intra-cardiac electrograms in this context.
• To emphasize the importance of these findings during implantable cardioverter defibrillator (ICD) interrogations.

Main Methods:

• Case presentation of a patient with structural heart disease.
• Electrophysiology study and radiofrequency ablation.
• Analysis of intra-cardiac electrograms.

Main Results:

• The case demonstrated significant intra-atrial conduction delays.
• These delays presented challenges in electrogram interpretation.
• Potential for misinterpretation during ICD interrogations was identified.

Conclusions:

• Intra-atrial conduction delays are a critical consideration in patients with structural heart disease and prior surgeries.
• Careful electrogram interpretation is necessary to avoid diagnostic errors, particularly with implantable cardioverter defibrillators.
• Understanding these conduction patterns improves patient care and device management.