Key result
Volume-overload myocardial dysfunction persists 57 days after fistula closure with ~76% lower isoproterenol contractile response.
Why the study?
Myocardial dysfunction associated with volume-overload heart failure may not be reversible within the same time frame as its onset, but this persistence was not well characterized.
Does removal of chronic volume overload reverse myocardial dysfunction in a dog model of heart failure?
Comparison
Control state vs heart failure induced by atrioventricular fistula vs post-fistula closure
Design
Physiological study measuring contractile force and dose-response curves
Follow-up
Average 56 days with fistula plus 57 days post-closure
Authors
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Indicates potential irreversibility after volume-overload correction in this model; leaves open human HF recovery timelines.
Does removal of chronic volume overload reverse myocardial dysfunction in a dog model of heart failure?
Absolute Event Rate: 42% vs 173%
Myocardial dysfunction induced by chronic volume overload persists even after the volume overload is removed, suggesting irreversible or slowly reversible changes in myocardial contractility.
Newman et al. (1982) studied Volume-overload heart failure (n=6). Creation and closure of atrioventricular fistula vs. Baseline (control state) was evaluated on Increase in contractile force in response to 0.1 micrograms/kg of isoproterenol. Myocardial dysfunction from volume-overload heart failure persisted 57 days after fistula closure, with the contractile response to isoproterenol remaining depressed compared to baseline.
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