Wandering Atrial Pacemaker - EKG Reference Caliper Time Interval: ___ seconds Key Features RhythmMay be irregular RateNormal (60-100 bpm) P WaveChanging shape and size from beat to beat (at least three different forms) PR IntervalVariable QRSNormal (0.06-0.10 sec) NotesT wave normal. If heart rate exceeds 100 bpm, then rhythm may be multifocal atrial tachycardia (MAP) Wandering Atrial Pacemaker EKG Reference Quick Links Sinus Atrial Junctional Ventricular Atrioventricular Pacemaker All