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Basic measures of atrial action potential (AP) propagation, activation and recovery. AP amplitude was measured from the baseline to the peak voltage excursion. AP duration was measured as 90% recovery to baseline (APD90), and AP latencies were measured as the time elapsed between the pacing stimulus and peak of the AP. Maximum rates of depolarization (dV/dt)max were calculated from the first differential of the intracellular AP waveform.
