What is the clinical evidence from this study?

Population: Extensive myocardial infarction (n=9). Intervention: Electrophysiologic and histologic mapping. Primary outcome: Mechanism of activation delay during ventricular tachycardia.

What question did this study set out to answer?

The research aims to investigate the relationship between the arrangement of surviving cardiac fibers and the occurrence of ventricular tachycardia in infarcted human hearts.

June 28, 2026Journal of the American College of Cardiology

Ventricular tachyrdia in the infarcted, Langendorff-perfused human heart: Role of the arrangement of surviving cardiac fibers

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Key result

Electrophysiologic mapping shows VT activation delay follows a zigzag route over surviving myocyte bundles.

Key Points

The research aims to investigate the relationship between the arrangement of surviving cardiac fibers and the occurrence of ventricular tachycardia in infarcted human hearts.
Electrophysiologic and histologic studies were conducted on Langendorff-perfused human hearts from transplant patients with extensive infarction.
Induced sustained ventricular tachycardias were mapped via epicardial and endocardial electrical activity.
Histologic examinations assessed the arrangement of viable myocardial tissue in relation to activation timing during tachycardia.
Fifteen episodes of sustained ventricular tachycardia were induced in nine hearts, revealing variable activation patterns.
In hearts with small time gaps between activations, surviving tissue formed a continuous tract across the infarct.
In hearts with larger time gaps, surviving myocytes were arranged in separate bundles, affecting electrical conductivity.

Structured PICO

Population

9 explanted human hearts from patients who underwent heart transplantation due to extensive infarction, studied ex vivo.

Exposure

Programmed stimulation to induce ventricular tachycardia, followed by epicardial and endocardial mapping and histologic examination

Outcome

Electrophysiologic and histologic characteristics of the infarcted area during induced ventricular tachycardiasurrogate

Surviving myocardial tissue in infarcted human hearts forms complex branching bundles that cause activation delay and facilitate ventricular tachycardia via a zigzag route of activation.

Discussion

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Implication

Myocyte survival patterns may shape VT circuits in infarcted hearts; hypothesis-generating for targeted ablation strategies.

Cite This Study

Baker et al. (1990) studied Extensive myocardial infarction (n=9). Electrophysiologic and histologic mapping was evaluated on Mechanism of activation delay during ventricular tachycardia. Electrophysiologic mapping of 9 explanted infarcted human hearts revealed that ventricular tachycardia activation delay is caused by a zigzag route over branching bundles of surviving myocytes.

synapsesocial.com/papers/6a413b651f4892dd109a17cb https://doi.org/10.1016/0735-1097(90)92832-m

Topics

Heart transplantation

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Ventricular tachyrdia in the infarcted, Langendorff-perfused human heart: Role of the arrangement of surviving cardiac fibers

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Topics

Ventricular tachyrdia in the infarcted, Langendorff-perfused human heart: Role of the arrangement of surviving cardiac fibers

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Also Consider

Topics

Also Consider