What question did this study set out to answer?

To characterize the time-dependent structural, ultrastructural, and electrophysiological alterations occurring in surviving epicardial border zone myocardium during infarct healing.

March 1, 1985Circulation ResearchOpen Access

Structural and electrophysiological changes in the epicardial border zone of canine myocardial infarcts during infarct healing.

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To characterize the time-dependent structural, ultrastructural, and electrophysiological alterations occurring in surviving epicardial border zone myocardium during infarct healing.
Occluded the left anterior coronary artery in canine models to establish transmural infarcts evaluated at 1 day, 5 days, 2 weeks, and 2 months post-occlusion.
Recorded transmembrane potentials and mapped impulse propagation in vitro using isolated superfused preparations alongside structural evaluations.
Subacute preparations (1 and 5 days) showed significant reductions in resting potential, action potential amplitude, upstroke velocity, and duration, alongside uniform anisotropic conduction and intracellular lipid droplet accumulation.
At 2 weeks, resting potentials, action potential amplitudes, and upstroke velocities normalized while action potential duration decreased further and connective tissue began separating muscle bundles.
By 2 months, action potentials normalized, but extensive connective tissue infiltration disoriented muscle fibers into a nonuniform anisotropic architecture, eliminating directional differences and severely slowing conduction.

Structured PICO

Population

Canine heart model with transmural infarcts induced by left anterior coronary artery (LAD) occlusion

Intervention

In vitro superfusion and mapping of isolated preparations at different times after LAD occlusion (1 day, 5 days, 2 weeks, 2 months)

Outcome

Structural and electrophysiological properties (resting potential, action potential amplitude, upstroke velocity, duration, and impulse propagation)surrogate

The persistence of slow conduction in healed canine myocardial infarcts due to connective tissue invasion may contribute to the occurrence of chronic arrhythmias.

Discussion

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Implication

May underlie chronic post-MI arrhythmias via connective tissue separation; hypothesis-generating in canine model, human relevance unknown.

Cite This Study

Ursell et al. (1985) studied this question.

synapsesocial.com/papers/69f14c6cc0d8017361865da0 https://doi.org/10.1161/01.res.56.3.436

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Implication

May underlie chronic post-MI arrhythmias via connective tissue separation; hypothesis-generating in canine model, human relevance unknown.

Structural and electrophysiological changes in the epicardial border zone of canine myocardial infarcts during infarct healing.

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Structural and electrophysiological changes in the epicardial border zone of canine myocardial infarcts during infarct healing.

Key Points

Structured PICO

Discussion

Implication

Cite This Study

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