ECG Quiz 72 Answers

Q: What is the clinical evidence from this study?

Study design: Case Report. Population: Ventricular tachycardia (n=1).

Q: What does this research mean for the field?

In regular wide QRS tachycardia, the presence of atrioventricular dissociation excludes supraventricular mechanisms and confirms ventricular tachycardia, which can arise from scar-related re-entry after surgical repair of tetralogy of Fallot. Novelty: ClaimNovelty.CONFIRMATORY. Consensus alignment: ConsensusAlignment.NEUTRAL.

Ashley Chin

doi:10.24170/23-2-8288

January 1, 2026SA HeartOpen Access

ECG Quiz 72 Answers

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Key result

ECG-detected AV dissociation confirms sustained monomorphic VT in repaired Tetralogy of Fallot.

n=1

Why the study?

Differentiating ventricular tachycardia from supraventricular tachycardia with wide QRS complex in children and young adults remains challenging and clinically important.

Key Points

To determine the underlying mechanism and clinical etiology of a fast, regular, wide QRS tachycardia in a pediatric case.
Analyzed 12-lead electrocardiograms during regular wide-complex tachycardia and following sinus rhythm restoration.
Evaluated QRS morphology, conduction delays from onset to nadir in leads V1–V2, frontal axis orientation, and signs of atrioventricular dissociation to differentiate ventricular tachycardia from supraventricular mimics.
The tachycardia presented at a rate of 250/min with a wide QRS duration of 190 ms and a QRS onset-to-nadir interval of 115 ms in V1–V2, exceeding the 70 ms threshold for typical left bundle branch block.
Visible dissociated P waves on lead SII confirmed atrioventricular dissociation, establishing a diagnosis of sustained monomorphic ventricular tachycardia and ruling out antidromic atrioventricular re-entry tachycardia.
Post-cardioversion electrocardiography demonstrated complete right bundle branch block with a QRS duration of 180 ms, confirming scar-related ventricular re-entry from surgically repaired tetralogy of Fallot.

Study Design

Type

Case Report (n=1)

PICO

P

Population

A young boy presenting with a fast, regular, wide QRS tachycardia who was diagnosed with ventricular tachycardia complicating a previous surgical repair of Tetralogy of Fallot.

Implication

Demonstrates diagnostic criteria for wide QRS tachycardia in a pediatric patient, highlighting atrioventricular dissociation in identifying scar-related ventricular tachycardia.

Abstract

ECG Quiz 71 Answers

Discussion

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Cite This Study

Ashley Chin (2026) conducted a case report in Ventricular tachycardia (n=1). Careful ECG analysis revealed atrioventricular dissociation, confirming the diagnosis of sustained monomorphic ventricular tachycardia in a child with a previously repaired Tetralogy of Fallot.

synapsesocial.com/papers/6ad0fd3315427f6a8404055a https://doi.org/10.24170/23-2-8288

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ECG Quiz 72 Answers

Key Points

Study Design

PICO

Implication

Abstract

Discussion

Cite This Study

ECG Quiz 72 Answers

Key Points

Study Design

PICO

Implication

Abstract

Discussion

Cite This Study

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