Atrial Flutter - EKG Reference Caliper Time Interval: ___ seconds Key Features 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 Atrial Flutter EKG Reference Definition of Atrial Flutter Atrial flutter is a very rapid pattern of atria contraction. Unlike atrial fibrillation, atrial flutter's electrical activity in the atria is coordinated. This rapid rate (250 to 350 times per minute) is too fast to allow the conduction of each impulse to the ventricles. Quick Links Sinus Atrial Junctional Ventricular Atrioventricular Pacemaker All