Fig. 1.

Afterhyperpolarizing potential (AHP) duration is increased in neurons from pressure overload-treated (PO) animals. Single action potentials, produced by injection of a brief depolarizing current (0.6 nA, 5 ms), were recorded from intracardiac neurons in both sham (black trace) and PO animals (gray trace). The duration of the afterhyperpolarization phase (AHP) of the action potential was significantly greater in neurons from PO animals. Resting membrane potentials: −52 mV (Sham) and −54 mV (PO).