A system and method for classifying cardiac complexes sensed during a tachycardia
episode. A first cardiac signal and a second cardiac signal are sensed, where the
first cardiac signal has a voltage. A first cardiac complex and a second cardiac
complex of a cardiac cycle are detected in the first and second cardiac signal,
respectively. A predetermined alignment feature is identified in the second cardiac
complex. A datum is defined, or positioned, at a specified interval from the predetermined
alignment feature of the second cardiac complex. Voltage values are then measured
from the first cardiac complex at each of two or more measurement intervals from
the datum. The voltage values are then compared voltage values measured from NSR
cardiac complexes to classify the first cardiac complex is either a ventricular
tachycardia complex or a supraventricular tachycardiac complex.
