Methods and systems for classifying cardiac responses to pacing stimulation and/or preventing retrograde cardiac conduction are described. Following delivery of a pacing pulse to an atrium of the patient's heart during a cardiac cycle, the system senses in the atrium for a retrograde P-wave. The system classifies the atrial response to the pacing pulse based on detection of the retrograde P-wave. The system may also sense for an atrial evoked response and utilize the atrial evoked response in classifying the cardiac pacing response. The system also performs cardiac response classification on the basis of timing features of cardiac signal. The system is capable of generating a cardiac response template and determines cardiac response based on template matching. Further, cardiac response may be determined on the basis of the baseline amplitude of the cardiac signal.
