Wandering Atrial Pacemaker - EKG Reference Caliper Time Interval: ___ seconds 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) Quick Links Sinus Atrial Junctional Ventricular Atrioventricular Pacemaker All