Frequency and Output-Dependent Change in Conduction Over Slow Pathways in a Patient with Sustained Ventricular Tachycardia Unrelated to Coronary Artery Disease
| Autor: | Makoto Tamura, Masaomi Chinushi, Yoshifusa Aizawa, Akira Shibata, Toshikazu Funazaki |
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| Rok vydání: | 1992 |
| Předmět: |
Male
Qrs morphology medicine.medical_specialty genetic structures Bundle-Branch Block Coronary Disease Stimulus (physiology) Ventricular tachycardia Coronary artery disease Electrocardiography QRS complex Heart Conduction System Tachycardia Internal medicine medicine Humans cardiovascular diseases Cycle length business.industry musculoskeletal neural and ocular physiology Cardiac Pacing Artificial General Medicine Middle Aged medicine.disease Electrophysiology Sustained ventricular tachycardia Anesthesia cardiovascular system Cardiology Cardiology and Cardiovascular Medicine business circulatory and respiratory physiology |
| Zdroj: | Pacing and Clinical Electrophysiology. 15:756-761 |
| ISSN: | 1540-8159 0147-8389 |
| Popis: | CHINUSHI, M., et al.: Frequency and Output-Dependent Change in Conduction Over Slow Pathways in a Patient with Sustained Ventricular Tachycardia Unrelated to Coronary Artery Disease. In a patient with sustained ventricular tachycardia, we obtained two different paced QRS morphologies from a single pacing site. In one QRS morphology the stimulus to the QRS complex was long, 150 msec, and in the other it was 100 msec. At the paced cycle Iength of 600 msec and the stimulus output of 4 V, one QRS morphology with the stimulus to the onset of QRS activation (St-QRS) interval of 150 msec was observed. At the paced cycle length of 400 msec, the other QRS morphology with a St-QRS interval of 100 msec was observed alternately with the former. At the paced cycle length of 353 msec or 316 msec, the latter with a shorter St-QRS interval was exclusively observed. When the stimulus output was increased from 4 to 10 V, keeping with the paced cycle length at 400 msec, the St-QRS interval was shortened from 100 to 80 msec. For the two QRS morphologies with two St-QRS intervals, two slowly conducting pathways would be responsible. The site of the block in the faster pathway must be located at the proximity of the pacing site and the conduction at a shorter paced cycle length would be explained by “supernormal conduction.” |
| Databáze: | OpenAIRE |
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