Atrial Flutter with Spontaneous 1:1 Atrioventricular Conduction in Adults: An Uncommon but Frequently Missed Cause for Syncope/Presyncope

Abstract

The main difference between groups A and B may be an inherent capacity of the AV node for faster conduction, especially in response to increased sympathetic tone. The latter affects not only AVC but also the AFl CL. One should be aware of the different presentations of AFl with 1:1 AVC to avoid misdiagnosis/mismanagement and to consider the diagnosis in patients with narrow or wide QRS tachycardia and rates above 220/min.