Atrial Flutter - EKG Reference This reference guide requires a paid plan Unlock quizzes, lessons and more. Sign Up Key Features 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