Introduction:

Atrial fibrillation is the most frequent arrhythmia in PMK/ICD patients. The diagnosis from surface ECG generally is not difficult, with rare exceptions. It is of interest, somewhat, analysis of some specific functions of pacemakers that should be known to correctly explain ECG patterns. These algorithms have been introduced whether to prevent AF (Atrial Preference Pacing, Atrial Rate Stabilization, Post Mode Switching Overdrive Pacing (PMOP)) or to interrupt it (ATP - AntiTachycardic Pacing - burst, ramp, shock).