Key result
Procaine amide alters action potentials in neonatal canine cardiac tissue only at high concentrations.
Why the study?
Does procaine amide have different electrophysiological effects on neonatal versus adult dog myocardium?
Does procaine amide have different electrophysiological effects on neonatal versus adult dog myocardium?
p-value: p=<= 0.05
Neonatal cardiac tissue demonstrates greater electrophysiological tolerance to procaine amide compared to adult tissue, potentially explaining the need for higher doses in human neonates.
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Neonatal canine tolerance to procainamide may not apply to humans; leaves open age-specific dosing implications pending clinical data.
Ezrin et al. (2019) studied Normal cardiac electrophysiology (n=32). Procaine amide vs. Adult preparations was evaluated on Electrophysiological parameters (MDP, APA, APD100, APD50, Vmax, membrane responsiveness, ERP) (p=<= 0.05). Neonatal canine cardiac tissue demonstrated electrophysiological tolerance to procaine amide at concentrations up to 10^-4 M, requiring 5 x 10^-4 M to significantly alter action potential parameters.
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