| Autor: | Louise Harris, Elias Sevaptsidis, S. Kimber, J. C. Doig, Lynda L. Mickleborough, Stéphane Massé, T. C. K. Chen, J. Saito, M.-H. Shi, Eugene Downar |
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| Rok vydání: | 1998 |
| Předmět: |
Tachycardia
medicine.medical_specialty medicine.diagnostic_test business.industry medicine.medical_treatment Diastole Catheter ablation Reentry medicine.disease Ventricular tachycardia QRS complex Physiology (medical) Anesthesia Internal medicine cardiovascular system medicine Cardiology cardiovascular diseases Myocardial infarction medicine.symptom Cardiology and Cardiovascular Medicine business Electrocardiography |
| Zdroj: | Journal of Interventional Cardiac Electrophysiology. 2:235-245 |
| ISSN: | 1383-875X |
| DOI: | 10.1023/a:1009776618809 |
| Popis: | Background:Diastolic potentials are often sought as a possible site for catheter ablation in post-infarct ventricular tachycardia. However, delivery of energy at such sites is often unsuccessful. The purpose of this study was to determine the characteristics of local electrograms with diastolic potentials and to identify activation pattern which might indicate the critical portion of the return path of the ventricular tachycardia reentry circuit. Methods: In 17 patients with post-myocardial infarction ventricular tachycardia, 30 ventricular tachycardias were mapped with an 112 bipolar endocardial balloon at the time of surgery. Diastolic mapping of the return tract in ventricular tachycardia was performed. Four activation patterns were observed (15 figure 8 patterns, 2 circular patterns, 2 biregional patterns and 11 monoregional patterns). Of 3,360 local electrograms, 207 (6.2%) demonstrated a diastolic potential in ventricular tachycardia. They were classified into following four categories, based on the appearance and timing of the systolic component. Type A-1 electrogram: systolic activation was of low amplitude ( |
| Databáze: | OpenAIRE |
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