Shortest A1-A2 interval recorded at a designated site before failure of A1-A2 to capture the atrium.
Atrial FRP
Longest A1-A2 interval that fails to achieve atrial capture.
Atrial ERP
Shortest H1-H2 in response to any A1-A2
AVN ERP
Longest H1-H2 not propagating to the ventricles
HPS ERP
Longest S1-S2 interval that fails to capture the ventricles
Ventricular ERP