What is the clinical evidence from this study?

Population: Atrioventricular junctional reentrant tachycardia (n=12). Intervention: Electrophysiological mapping and histology. Primary outcome: Origin of double potentials (LH and HL).

What does this research mean for the field?

LH double potentials arise from asynchronous activation near the coronary sinus, while HL double potentials arise from asynchronous activation of atrial and nodal-type cells along the tricuspid annulus, which may represent the substrate of the slow AV nodal pathway. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To determine the histological and electrophysiological origins of extracellular double potentials near the atrioventricular node used to guide slow pathway catheter ablation.

May 1, 1994Circulation

Origin and significance of double potentials near the atrioventricular node. Correlation of extracellular potentials, intracellular potentials, and histology.

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Key result

In 12 isolated animal hearts, LH potentials arose from asynchronous activation near the coronary sinus, while HL potentials arose from asynchronous activation of atrial and nodal-type cells.

Key Points

To determine the histological and electrophysiological origins of extracellular double potentials near the atrioventricular node used to guide slow pathway catheter ablation.
Conducted in isolated, blood-perfused porcine (n = 8) and canine (n = 4) hearts.
Mapped potential origins using intracellular microelectrode recording, extracellular mapping, pacing from multiple sites, and light microscopy.
Identified low-to-high frequency (LH) double potentials near the coronary sinus orifice, caused by asynchronous activation of the sinus septum and the tissue between the coronary sinus and tricuspid annulus.
Identified high-to-low frequency (HL) double potentials along the tricuspid annulus, generated by asynchronous activation of deep subendocardial atrial cells and superficial nodal-type cells.
Demonstrated that the superficial nodal-type cell band along the tricuspid annulus is distinct from the compact AV node and represents the anatomical substrate of the slow AV nodal pathway.

Structured PICO

Population

Isolated, blood-perfused porcine (n = 8) and canine (n = 4) hearts

Intervention

Microelectrode recording, extracellular mapping, pacing from multiple sites, and light microscopy

Outcome

Origin and significance of extracellular double potentials (LH and HL potentials)surrogate

HL double potentials near the tricuspid annulus are caused by asynchronous activation of atrial and nodal-type cells, which may represent the substrate of the slow AV nodal pathway.

Discussion

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Implication

Animal data links HL potentials to slow pathway substrate; leaves open whether they guide AVNRT ablation in patients.

Cite This Study

McGuire et al. (1994) studied Atrioventricular junctional reentrant tachycardia (n=12). Electrophysiological mapping and histology was evaluated on Origin of double potentials (LH and HL). In 12 isolated animal hearts, LH potentials arose from asynchronous activation near the coronary sinus, while HL potentials arose from asynchronous activation of atrial and nodal-type cells.

synapsesocial.com/papers/6a153a055347fbb1739f6fad https://doi.org/10.1161/01.cir.89.5.2351

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Origin and significance of double potentials near the atrioventricular node. Correlation of extracellular potentials, intracellular potentials, and histology.

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Origin and significance of double potentials near the atrioventricular node. Correlation of extracellular potentials, intracellular potentials, and histology.

Key Points

Structured PICO

Discussion

Implication

Cite This Study

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