Multifocal Atrial Tachycardia - EKG Reference Caliper Time Interval: ___ seconds Key Features RhythmIrregular RateFast (> 100 bpm) P WaveOften changing shape and size from beat to beat (at least three differing forms) PR IntervalVariable QRSNormal (0.06-0.10 sec) NotesT wave is often distorted Also review wandering atrial pacemaker lesson Multifocal Atrial Tachycardia EKG Reference Quick Links Sinus Atrial Junctional Ventricular Atrioventricular Pacemaker All