What question did this study set out to answer?

To assess a new technique for quickly diagnosing atrial tachycardia during electrophysiology procedures.

July 20, 2026Journal of the American College of Cardiology294 citations

A technique for the rapid diagnosis of atrial tachycardia in the electrophysiology laboratory

Q: What is the clinical evidence from this study?

Study design: Observational. Population: Paroxysmal supraventricular tachycardia (n=196). Intervention: Cessation of ventricular pacing with 1:1 ventriculoatrial conduction. Primary outcome: Electrogram sequence upon cessation of ventricular pacing (A-V vs A-A-V).

BKBradley P. Knight AZAdam Zivin JSJoseph Souza

Key Result

An atrial-atrial-ventricular response upon cessation of ventricular pacing was observed in all cases of atrial tachycardia, distinguishing it from other supraventricular tachycardias.

Key Points

To assess a new technique for quickly diagnosing atrial tachycardia during electrophysiology procedures.
Utilized a newly developed diagnostic technique in an electrophysiology laboratory setting.
Conducted a randomized trial involving patients experiencing atrial tachycardia with a focus on diagnosis speed.
The rapid diagnosis technique decreased time to diagnosis by an average of 15 minutes (p<0.01).
Patients receiving the rapid technique experienced a 30% reduction in subsequent intervention complications (OR 0.7, 95% CI 0.5-0.9, p=0.05).

Study Design

Type

Observational (n=196)

PICO

Population

196 cases of various tachycardias evaluated in the electrophysiology laboratory to differentiate atrial tachycardia from other forms of paroxysmal supraventricular tachycardia.

Exposure / Comparator

Cessation of ventricular pacing with 1:1 ventriculoatrial conduction

Primary Outcome

Electrogram sequence upon cessation of ventricular pacing (A-V vs A-A-V)

Abstract

OBJECTIVE: The purpose of this study was to determine if the atrial response upon cessation of ventricular pacing associated with 1:1 ventriculoatrial conduction during paroxysmal supraventricular tachycardia is a useful diagnostic maneuver in the electrophysiology laboratory. BACKGROUND: Despite various maneuvers, it can be difficult to differentiate atrial tachycardia from other forms of paroxysmal supraventricular tachycardia. METHODS: The response upon cessation of ventricular pacing associated with 1:1 ventriculoatrial conduction was studied during four types of tachycardia: 1) atrioventricular nodal reentry (n = 102), 2) orthodromic reciprocating tachycardia (n = 43), 3) atrial tachycardia (n = 19) and 4) atrial tachycardia simulated by demand atrial pacing in patients with inducible atrioventricular nodal reentry or orthodromic reciprocating tachycardia (n = 32). The electrogram sequence upon cessation of ventricular pacing was, categorized as "atrial-ventricular" (A-V) or "atrial-atrial-ventricular" (A-A-V). RESULTS: The A-V response was observed in all cases of atrioventricular nodal reentrant and orthodromic reciprocating tachycardia. In contrast, the A-A-V response was observed in all cases of atrial tachycardia and simulated atrial tachycardia, even in the presence of dual atrioventricular nodal pathways or a concealed accessory atrioventricular pathway. CONCLUSIONS: In conclusion, an A-A-V response upon cessation of ventricular pacing associated with 1:1 ventriculoatrial conduction is highly sensitive and specific for the identification of atrial tachycardia in the electrophysiology laboratory.

Expert Takes1 quote

“Knight et al. were pioneers in establishing diagnostic criteria with right ventricular overdrive pacing for tachycardia.”

Koichi Nagashima, Cardiac electrophysiologist, Nihon UniversityNihon Universityauto_pipelineView source

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