Parameters of cardiac activity after administration of the cholinesterase inhibitor physostigmine were analyzed in newborn rats and on day 16 of postnatal development. The type of cardiovascular response to acetylcholine excess in newborns and 16-day-old rats were similar, but they significantly differed by the magnitude, which suggests that that maturation of cholinergic structures involved in the regulation of cardiac activity is completed during the early postnatal ontogeny.
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