Key result
Myocardial unloading via heterotopic transplantation in rats led to a 41% decrease in median myocyte volume while maintaining intact contractile function when normalized to cell dimensions.
Why the study?
Does myocardial unloading alter intrinsic cardiac contractility in rat hearts?
Population
Rat hearts (normal hearts undergoing heterotopic transplantation for myocardial unloading)
Comparison
Myocardial unloading via heterotopic… vs Normal/loaded hearts (implied reference)
Design
Preclinical
Authors
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Unloading-induced atrophy need not impair contractility in vitro; leaves open translation to clinical unloading scenarios.
Does myocardial unloading alter intrinsic cardiac contractility in rat hearts?
Myocardial atrophy induced by unloading preserves intrinsic cellular contractile function when normalized for cell size, despite a reduction in overall myocardial mass and work capacity.
Welsh et al. (2001) studied Myocardial atrophy. Myocardial unloading via heterotopic transplantation vs. Normal hearts was evaluated on Cardiac contractility (fractional shortening, time to peak contraction, relaxation times, and maximal force generation). Myocardial unloading via heterotopic transplantation in rats led to a 41% decrease in median myocyte volume while maintaining intact contractile function when normalized to cell dimensions.
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