Why the study?
Can 12-lead ECG characteristics differentiate between supravalvular and infravalvular origins of left ventricular outflow tract tachycardia?
Population
17 patients with idiopathic left ventricular outflow tract tachycardia confirmed by activation and pace…
Comparison
12-lead electrocardiogram (ECG) analysis vs Supravalvular region of a coronary cusp versus…
Design
Cross-sectional
Key result
Supravalvular LVOT-VT origin lacked an S wave in leads V5 or V6 in 88% of patients, whereas 100% of infravalvular origins exhibited an Rs pattern in these leads.
Authors
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ECG criteria may aid LVOT-VT localization; hypothesis-generating and requires prospective validation before clinical use.
Observational (n=17)
Can 12-lead ECG characteristics differentiate between supravalvular and infravalvular origins of left ventricular outflow tract tachycardia?
Absolute Event Rate: 88% vs 0%
Specific 12-lead ECG patterns, such as the presence or absence of an S wave in leads V5 and V6, can help differentiate supravalvular from infravalvular origins of left ventricular outflow tract tachycardia.
Hachiya et al. (2000) conducted an observational in Idiopathic left ventricular outflow tract tachycardia (LVOT-VT) (n=17). Supravalvular (Supra-Ao) LVOT-VT origin vs. Infravalvular (Infra-Ao) LVOT-VT origin was evaluated on Absence of S wave in lead V5 or V6. Supravalvular LVOT-VT origin lacked an S wave in leads V5 or V6 in 88% of patients, whereas 100% of infravalvular origins exhibited an Rs pattern in these leads.