Patent ID: 7957800

Claim:
A method comprising: implementing an atrial-based pacing mode, wherein ventricular pacing is not delivered in a given cardiac cycle while the medical device operates in the atrial-based pacing mode and said pacing mode comprises at least a one of: an ADI/R pacing mode, an ADI pacing mode, an AAI/R pacing mode, an AAI pacing mode; detecting whether a relatively reliable AV conduction condition is present in the given cardiac cycle; switching to a dual-chamber pacing mode at the expiration of the given cardiac cycle in the event that the relatively reliable AV conduction is not detected; and repeatedly attempting to detect whether the relatively reliable AV conduction condition is present while operating in the dual-chamber pacing mode, and if present, then mode switching to a one of: the an ADI/R pacing mode, the ADI pacing mode, the AAI/R pacing mode, the AAI pacing mode, and if not present, continuing the dual-chamber pacing mode.