Exemplary methods and devices for determining whether fusion or pseudofusion
have occurred. An exemplary method includes delivering a stimulus, sensing cardiac
activity, determining whether the stimulus resulted in capture, and if the determining
indicates that the stimulus did not result in capture, then, determining whether
the sensed cardiac activity includes characteristics of native cardiac activity
by comparing at least some of the sensed cardiac activity to a template. Accordingly,
if the sensed activity includes native activity, then a diagnosis is made that
the stimulus resulted in fusion or pseudofusion. Another exemplary method includes
determining whether a stimulus resulted in capture, and if the determining indicates
that the stimulus did not result in capture, then, adjusting sensitivity of a sensor
and sensing cardiac activity using the sensor. According to this method, if cardiac
activity is sensed, then a diagnosis is made that the stimulus resulted in fusion
or pseudofusion. Various methods and/or devices are suitable for use with autocapture.
Other methods, devices and/or systems are also disclosed.
