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Continuous electrical activity during sustained monomorphic ventricular tachycardia. Observations on its dynamic
The American Journal of Cardiology
|February 1, 1985
Summary
Continuous electrical activity during ventricular tachycardia (VT) often represents abnormal heart areas, not necessarily perpetuating VT. This transient activity can simulate VT but may disappear spontaneously or with pacing.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Devices
Background:
- Monomorphic ventricular tachycardia (VT) is a significant arrhythmia.
- Understanding the electrophysiological substrate of VT is crucial for effective treatment.
Purpose of the Study:
- To investigate the characteristics and significance of continuous electrical activity during monomorphic VT.
- To differentiate true VT substrate from simulated electrical activity.
Main Methods:
- Catheter mapping during sinus rhythm and VT in 56 patients.
- Categorization into VT-old myocardial infarction, VT-right ventricular dysplasia, and idiopathic VT groups.
- Analysis of continuous electrical activity patterns and responses to pacing and drugs.
Main Results:
- Continuous electrical activity was observed in 36% of VT-old MI, 83% of VT-RV dysplasia, and 0% of idiopathic VT patients.
- Dynamic behaviors like spontaneous termination, pacing-induced changes, and rate-dependency were noted.
- Continuous electrical activity occurred in aneurysmal but not normal heart areas; abnormal potentials were seen during sinus rhythm.
Conclusions:
- Several phenomena can simulate continuous electrical activity during monomorphic VT.
- Transient continuous electrical activity is frequent and originates from abnormal areas, not always essential for VT perpetuation.
- This activity may represent bystander electrical signals rather than the VT circuit itself.