Key result
Reversal of congestive heart failure in dogs normalized atrial function, but atrial fibrosis (12.0% vs 3.1% in controls) and conduction abnormalities were not reversible.
Why the study?
Does reversal of congestive heart failure reverse atrial structural remodeling and atrial fibrillation substrate in dogs?
Population
Chronically instrumented dogs
Comparison
4 to 6 weeks of ventricular tachypacing to… vs Control dogs
Design
Preclinical
Follow-up
5 weeks
Authors
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HF reversal may leave persistent AF substrate; leaves open whether antifibrotic therapies can mitigate irreversible remodeling in patients.
Does reversal of congestive heart failure reverse atrial structural remodeling and atrial fibrillation substrate in dogs?
Absolute Event Rate: 12% vs 3.1%
While reversal of heart failure normalizes atrial function and decreases AF duration, structural changes like fibrosis and conduction abnormalities persist, maintaining an arrhythmogenic substrate.
Shinagawa et al. (2002) studied Atrial fibrillation and congestive heart failure. Ventricular tachypacing followed by recovery vs. Controls was evaluated on Atrial fibrosis. Reversal of congestive heart failure in dogs normalized atrial function, but atrial fibrosis (12.0% vs 3.1% in controls) and conduction abnormalities were not reversible.
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