What is the clinical evidence from this study?

Study design: Observational. Population: Outflow tract ventricular tachycardia or premature ventricular contraction (n=31). Intervention: Electrophysiologic study and catheter ablation vs. Right and left ventricular endocardial origins. Primary outcome: Incidence of left ventricular epicardial origin.

What does this research mean for the field?

Outflow tract ventricular tachycardias originating from the left ventricular epicardium account for approximately 13% of cases, present with distinct electrocardiographic characteristics, and can sometimes be successfully ablated from the left sinus of Valsalva. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

January 1, 2001Japanese Circulation JournalOpen Access

Left Ventricular Epicardial Outflow Tract Tachycardia

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Why the study?

What are the incidence and ECG characteristics of outflow tract ventricular tachycardias originating from the left ventricular epicardium?

Population

31 consecutive patients with ventricular tachycardia or premature ventricular contraction originating from…

Design

Cohort

Key result

Outflow tract ventricular tachycardia originating from the left ventricular epicardium was found in 13% of patients and exhibited characteristic ECG findings including prominent tall R-waves in the inferior leads.

Authors

HTHiroshi Tada ANAkihiko Nogami SNShigeto Naito

Discussion

Member takes

Overview

ECG features may aid localization of LV epicardial outflow tract VT; leaves open need for prospective validation before guiding ablation.

Key Points

This study aims to explore the incidence and ECG characteristics of ventricular tachycardias originating from the left ventricular epicardium.
Thirty-one patients with ventricular tachycardia underwent catheter ablation for outflow tract VTs.
Electrocardiograms were analyzed during pacing from the left ventricular epicardium and left sinus of Valsalva.
The study categorized VTs based on their origin and ablation site.
Four of thirty-one VT cases originated from the LV epicardium (13%).
Characteristic ECG features included tall R-waves in inferior leads and unique morphologies like atypical left bundle branch block.
Some epicardial VTs were successfully ablated from the left sinus of Valsalva.

Study Design

Type

Observational (n=31)

Multicenter

Structured PICO

What are the incidence and ECG characteristics of outflow tract ventricular tachycardias originating from the left ventricular epicardium?

Population

31 consecutive patients with ventricular tachycardia or premature ventricular contraction originating from the outflow tract (OT-VT) undergoing catheter ablation

Intervention

Catheter ablation and ECG mapping/pacing

Outcome

Incidence and ECG characteristics of ventricular tachycardias originating from the left ventricular epicardiumsurrogate

Outflow tract ventricular tachycardias originating from the LV epicardium are not uncommon (13%) and exhibit distinct ECG features that can aid in localization and ablation.

Limitations

Bipolar pacing with 5-mm interelectrode spacing may have obscured subtle changes in QRS morphology compared to unipolar pacing.
Relatively small number of patients studied.
Inability to ablate the VT focus in 3 patients due to difficulties with catheter manipulation and proximity to the coronary artery.

Cite This Study

Tada et al. (2001) conducted an observational in Outflow tract ventricular tachycardia or premature ventricular contraction (n=31). Electrophysiologic study and catheter ablation vs. Right and left ventricular endocardial origins was evaluated on Incidence of left ventricular epicardial origin. Outflow tract ventricular tachycardia originating from the left ventricular epicardium was found in 13% of patients and exhibited characteristic ECG findings including prominent tall R-waves in the inferior leads.

synapsesocial.com/papers/6a0836e7280cd4e998e8aecc https://doi.org/10.1253/jcj.65.723

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January 1, 2001Japanese Circulation JournalOpen Access

Left Ventricular Epicardial Outflow Tract Tachycardia

View Full Paper

Ask AI

Bookmark

Why the study?

What are the incidence and ECG characteristics of outflow tract ventricular tachycardias originating from the left ventricular epicardium?

Population

31 consecutive patients with ventricular tachycardia or premature ventricular contraction originating from…

Design

Cohort

Key result

Authors

HTHiroshi Tada ANAkihiko Nogami SNShigeto Naito

Discussion

Member takes

Overview

ECG features may aid localization of LV epicardial outflow tract VT; leaves open need for prospective validation before guiding ablation.

Key Points

This study aims to explore the incidence and ECG characteristics of ventricular tachycardias originating from the left ventricular epicardium.
Thirty-one patients with ventricular tachycardia underwent catheter ablation for outflow tract VTs.
Electrocardiograms were analyzed during pacing from the left ventricular epicardium and left sinus of Valsalva.
The study categorized VTs based on their origin and ablation site.
Four of thirty-one VT cases originated from the LV epicardium (13%).
Characteristic ECG features included tall R-waves in inferior leads and unique morphologies like atypical left bundle branch block.
Some epicardial VTs were successfully ablated from the left sinus of Valsalva.

Study Design

Type

Observational (n=31)

Multicenter

Structured PICO

What are the incidence and ECG characteristics of outflow tract ventricular tachycardias originating from the left ventricular epicardium?

Population

31 consecutive patients with ventricular tachycardia or premature ventricular contraction originating from the outflow tract (OT-VT) undergoing catheter ablation

Intervention

Catheter ablation and ECG mapping/pacing

Outcome

Incidence and ECG characteristics of ventricular tachycardias originating from the left ventricular epicardiumsurrogate

Outflow tract ventricular tachycardias originating from the LV epicardium are not uncommon (13%) and exhibit distinct ECG features that can aid in localization and ablation.

Limitations

Bipolar pacing with 5-mm interelectrode spacing may have obscured subtle changes in QRS morphology compared to unipolar pacing.
Relatively small number of patients studied.
Inability to ablate the VT focus in 3 patients due to difficulties with catheter manipulation and proximity to the coronary artery.

Cite This Study

synapsesocial.com/papers/6a0836e7280cd4e998e8aecc https://doi.org/10.1253/jcj.65.723

Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

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