What is the clinical evidence from this study?

Population: A-V conduction disturbance. Intervention: Acetylcholine. Primary outcome: Action potential and stimulus conduction characteristics in the A-V nodal region.

What question did this study set out to answer?

To examine the electrophysiological properties of action potentials and stimulus propagation within the atrioventricular nodal region in relation to local histological features.

January 1, 1966Japanese Circulation Journal-english EditionOpen Access

An Experimental Study on the Conduction of Excitation in the A-V Nodal Region

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Key result

Electrophysiological mapping revealed that the boundary of characteristic action potential changes during acetylcholine-induced A-V block occurs at the netlike atrial margin of the A-V node.

Key Points

To examine the electrophysiological properties of action potentials and stimulus propagation within the atrioventricular nodal region in relation to local histological features.
Recorded intracellular action potentials from the upper atrioventricular node to the bundle of His using an ultramicroelectrode technique during normal sinus rhythm.
Verified microelectrode tip localization histologically using cobalt ion migration.
Applied acetylcholine to experimentally induce atrioventricular conduction disturbances.
Identified transitional muscle fibers near the atrioventricular node with action potentials intermediate between nodal and atrial types.
Observed a progressive shift to His-type action potentials and gradual activation delays as electrodes advanced from the upper node toward the bundle of His.
Elicited incomplete block, complete dissociation, and nodal or ventricular capture with acetylcholine, localizing the functional boundary of conduction failure to the netlike atrial margin of the node.

Structured PICO

Population

A-V nodal region studied electrophysiologically by means of ultramicroelectrode technique

Intervention

Acetylcholine to induce A-V conduction disturbances

Comparator

Normal sinus rhythm

Outcome

Characteristics of the action potential and stimulus conductionsurrogate

This experimental study maps the electrophysiological changes during normal and acetylcholine-induced disturbed A-V conduction, localizing the boundary of characteristic action potential changes to the atrial margin of the A-V node.

Discussion

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Implication

Localizes AV block boundary in acetylcholine animal models; leaves open translation to human conduction mechanisms.

Cite This Study

Toshiya Nagata (1966) studied A-V conduction disturbance. Acetylcholine was evaluated on Action potential and stimulus conduction characteristics in the A-V nodal region. Electrophysiological mapping revealed that the boundary of characteristic action potential changes during acetylcholine-induced A-V block occurs at the netlike atrial margin of the A-V node.

synapsesocial.com/papers/6a9f9f2ec2a6bb3d9844a519 https://doi.org/10.1253/jcj.30.1507

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An Experimental Study on the Conduction of Excitation in the A-V Nodal Region

Key Points

Structured PICO

Discussion

Implication

Cite This Study

An Experimental Study on the Conduction of Excitation in the A-V Nodal Region

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Also Consider

Also Consider