Fig. 1

Electrically evoked action potentials in the rat AZV. a The points of AP recordings (dots) and sites (white frames) of excitation mapping in the proximal (1) and distal (2) portions of the AZV. b Representative examples of AP from the electrically paced left atria (LA), right atria (RA), proximal (AZV _prox ) and distal (AZV _dist ) regions of the AZV. AP duration at level of 50% (c) and 90% (d) repolarization (APD₅₀, APD₉₀, respectively) in LA, RA, proximal and distal portions of the AZV. LSVC left superior vena cava; *,^# p < 0.05 (ANOVA); *all sites vs. RA; ^#proximal vs. distal azygos