Electrical and mechanical modulations by oxygen-derived free-radical generating systems in guinea-pig heart muscles.


The effects of free-radical generating systems and angiotensin-converting enzyme (ACE) inhibitors on the action potentials and contractile force in guinea-pig cardiac muscles were examined using conventional microelectrode and whole-cell voltage-clamp methods at 36 degrees C. Hydrogen peroxide (30-100 microM) prolonged 50%, 75% and 90% repolarization of… (More)


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