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Excitability of Isolated Hearts from Rats During Postnatal Development

Excitability of Developing Rat Hearts. Introduction: After birth, cardiac myocytes undergo substantial growth and differentiation that affect their stimulation threshold. Cells from younger animals have a higher stimulation threshold than cells from adults. The aim of this work was to compare the excitability of isolated hearts of rats during postnatal development by measuring the stimulation threshold at several pulse durations.