Atrial Flutter - EKG Reference Caliper Time Interval: ___ seconds RhythmRegular or irregular RateFast (250-350 bpm) for Atrial, but ventricular rate is often slower P WaveNot observable, but saw-toothed flutter waves are present PR IntervalNot measurable QRSNormal (0.06-0.10 sec) Notes Quick Links Sinus Atrial Junctional Ventricular Atrioventricular Pacemaker All