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[Anti-tachycardia surgery in ventricular arrhythmia]
J Ostermeyer1, J K Kirklin, M Borggrefe
1Chirurgische Klinik und Poliklinik, Heinrich-Heine-Universität, Düsseldorf.
Herz
|April 1, 1990
Summary
Malignant ventricular tachycardia (VT) in ischemic heart disease patients has poor survival rates. Surgical ablation, guided by endocardial mapping, offers a potentially life-saving treatment option for drug-refractory cases.
Area of Science:
- Cardiology
- Cardiac Surgery
- Electrophysiology
Context:
- Recurrent sustained ventricular tachycardia (VT) is a serious complication of ischemic heart disease, particularly after myocardial infarction.
- Malignant VT, defined as life-threatening and drug-refractory, affects a significant number of post-myocardial infarction patients annually.
- The underlying substrate for malignant VT is typically ischemically damaged, inhomogeneously structured arrhythmogenic areas in the left ventricle.
Purpose:
- To describe the surgical treatment concept for malignant VT, focusing on endocardial mapping and ablation.
- To detail the methodology of identifying and surgically addressing arrhythmogenic areas.
- To present alternative surgical techniques aimed at blocking reentry circuits and improving patient outcomes.
Summary:
- Surgical treatment involves delineating arrhythmogenic areas using endocardial mapping, often located in the transition zone between viable muscle and left ventricular aneurysm.
- Mapping techniques, including local activity time measurements and multi-terminal electrode electrocardiograms, identify earliest activation during tachycardia and fragmented signals during sinus rhythm.
- Surgical ablation methods include endocardial resection and encircling endocardial resection to eliminate the arrhythmogenic substrate and reentry circuits, with modifications aiming to preserve left ventricular function.
Impact:
- Medically refractory VT carries a significantly higher risk of sudden death and poorer survival rates compared to medically controlled VT.
- Surgical intervention offers a crucial therapeutic option for patients with drug-refractory malignant VT who are candidates for antitachycardia operations.
- Effective surgical ablation can improve survival rates and reduce arrhythmic events in patients with malignant VT, thereby enhancing long-term prognosis.