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Endocardial catheter mapping in patients in sinus rhythm: relationship to underlying heart disease and ventricular
Insights
Electrophysiologic mapping reveals distinct endocardial substrates in patients with ventricular arrhythmias. Congestive noncoronary cardiomyopathy patients show normal endocardium, unlike those with coronary artery disease and sustained ventricular tachycardia.
Area of Science:
- Cardiology
- Electrophysiology
- Cardiac Arrhythmias
Background:
- Ventricular arrhythmias (VA) are complex, with underlying electrophysiologic substrates potentially varying by disease type.
- Understanding these differences is crucial for effective patient management and treatment strategies.
Purpose of the Study:
- To compare endocardial electrogram characteristics and slow conduction indexes in patients with coronary artery disease (CAD) versus congestive noncoronary cardiomyopathy (CNCM).
- To determine if these electrophysiologic parameters differ across various ventricular arrhythmia severities.
Main Methods:
- Catheter mapping during sinus rhythm was performed in 132 CAD patients and 26 CNCM patients.
- Patients presented with varied clinical histories: no VA, nonsustained VA, cardiac arrest, or sustained VA.
- Endocardial electrogram characteristics and slow conduction indexes were analyzed and compared between disease and arrhythmia groups.
Main Results:
- The CNCM group exhibited a higher percentage of normal endocardial electrograms and no evidence of slow endocardial conduction compared to the CAD group.
- Patients with sustained ventricular tachycardia showed a greater proportion of abnormal endocardial electrograms and more evidence of slow endocardial conduction.
- These findings distinguished the sustained VA group from other arrhythmia classifications.
Conclusions:
- The electrophysiologic substrate underlying ventricular arrhythmias is not uniform and varies significantly based on the underlying cardiac disease and arrhythmia type.
- Treating all ventricular arrhythmia patients as a monolithic group is inappropriate.
- Patients with CNCM generally possess a relatively normal endocardium, irrespective of their arrhythmia type, suggesting they may not be suitable candidates for ablative surgery targeting abnormal endocardium.
Abstract:
Catheter mapping during sinus rhythm was performed in 132 patients with coronary artery disease and 26 patients with congestive noncoronary cardiomyopathy. Each of the patients had a clinical history of one of the following: no ventricular arrhythmia, nonsustained ventricular tachycardia, cardiac arrest, or sustained ventricular tachycardia. The characteristics of the endocardial electrogram and other measured indexes of slow endocardial conduction were compared between patients with different types of disease and in different arrhythmia groups to determine if differences existed. The cardiomyopathic group had a higher percent of normal endocardial electrograms than the coronary artery disease group, with no evidence of slow endocardial conduction. The sustained ventricular tachycardia group exhibited a greater percent of abnormal endocardial electrograms and more evidence of slow endocardial conduction, distinguishing this group from the three other arrhythmia groups. We conclude the following: The underlying electrophysiologic substrate varies in patients with different ventricular arrhythmias. It is therefore inappropriate to analyze all patients with ventricular arrhythmias as a single group. Patients with congestive noncoronary cardiomyopathy, regardless of the type of their arrhythmia, have a relatively normal endocardium. Those patients with serious ventricular arrhythmias should not be considered candidates for surgery directed at removing abnormal endocardium.