Key result
Ventricular myocytes from failing human hearts exhibited depressed contraction amplitude at 1 Hz stimulation, slow relaxation, and beta-adrenoceptor desensitization compared to non-failing controls.
Population
Ventricular myocytes from failing human hearts and noradrenaline-treated guinea-pig myocytes
Comparison
In vitro stimulation at varying rates, exposure… vs Myocytes from non-failing human hearts
Design
Preclinical
Authors
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Does not alter clinical HF management; leaves open mechanistic targets for future therapies in isolated human myocytes.
The study identifies specific cellular and molecular defects in failing human ventricular myocytes, including beta-adrenoceptor desensitization and post-receptor defects involving Gi proteins, providing mechanistic insights into heart failure pathophysiology.
Harding et al. (1994) studied Heart failure. Heart failure vs. Non-failing heart was evaluated on Contraction amplitude and relaxation velocity. Ventricular myocytes from failing human hearts exhibited depressed contraction amplitude at 1 Hz stimulation, slow relaxation, and beta-adrenoceptor desensitization compared to non-failing controls.
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