The effects of neuropeptide Y (10-10 M) on electrical activity of right atrial cardiomyocytes of rats aging 7, 21, and 100 days were examined in vitro. Neuropeptide Y affected the amplitude-temporal parameters of the action potential in these cells. It decreased the duration of repolarization phase in 7-day-old rats in concentrations of 10 and 10 M, in 21-day-old rats at 10 and 10 M, and in 100-day-old at 10 M. The data indicate elevation of total membrane potassium current under the action of neuropeptide Y.
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