Key result
Hearts from younger rats had a higher stimulation threshold than adults, with rheobase field decreasing from 0.21 to 0.09 V/cm and chronaxie increasing from 2.0 to 3.2 msec over 1 to 20 weeks.
Why the study?
Does postnatal development affect the stimulation threshold and excitability of isolated rat hearts?
Does postnatal development affect the stimulation threshold and excitability of isolated rat hearts?
Isolated hearts from younger rats have a higher stimulation threshold and require higher energy density for defibrillation compared to adult rats, which may have implications for pediatric defibrillation energy levels.
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May inform pediatric defibrillation energy selection; leaves open translation from rat models to humans.
Gomes et al. (2002) studied Postnatal development. Postnatal development (age) vs. Adult rats was evaluated on Stimulation threshold (rheobase field and chronaxie). Hearts from younger rats had a higher stimulation threshold than adults, with rheobase field decreasing from 0.21 to 0.09 V/cm and chronaxie increasing from 2.0 to 3.2 msec over 1 to 20 weeks.
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