Key result
Methoxamine increased the duration of the repolarization phase of the action potential in normal rats under continuous electrical pacing but decreased it in rats with normal sinus rhythm.
Why the study?
Does methoxamine affect the electrical activity of the atrial myocardium in rats?
Does methoxamine affect the electrical activity of the atrial myocardium in rats?
Methoxamine exerts dual, state-dependent effects on the duration of repolarization in rat atrial cardiomyocytes.
Findings in rats should not guide clinical use; leaves open state-dependent effects on atrial repolarization for further study.
The effect of methoxamine, an agonist at α1-adrenergic receptors, on the frequency of spontaneous activity and parameters of the electrical activity of the atrial myocardium was investigated in rats with normal sinus rhythm and in normal rats under continuous electrical pacing. Methoxamine exerted dual effects on the duration of repolarization of working cardiomyocytes. Methoxamine increased the duration of the repolarization phase of the action potential in normal rats under continuous electrical pacing but decreased it in rats with normal sinus rhythm.
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Mansour et al. (2023) studied Normal sinus rhythm and continuous electrical pacing in rats. Methoxamine was evaluated on Duration of repolarization of working cardiomyocytes. Methoxamine increased the duration of the repolarization phase of the action potential in normal rats under continuous electrical pacing but decreased it in rats with normal sinus rhythm.
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