Figure 4.
AOD from CS 1-2 advanced the tachycardia with an A-H-A response. AOD was
delivered just after the slow pathway refractory so that it
anterogradely captured and advanced the tachycardia via the slow
pathway. Note that the PPI at the proximal CS electrograms (CS 9,10) as
a proxy for septal activation had a PPI-TCL of 30 or 40 ms depending on
how one measures the TCL. This value confirmed that the atrial septum
near the tricuspid annulus was part of the reentrant circuit.