![]() The term “AV block” in the context of atrial flutter is something of a misnomer. Atrial flutter with 1:1 conduction is associated with severe haemodynamic instability and progression to ventricular fibrillation.The administration of AV-nodal blocking agents to a patient with Wolff-Parkinson-White syndrome can precipitate this Atrial flutter with 1:1 conduction can occur due to sympathetic stimulation, or in the presence of an accessory pathway.Higher-degree blocks can occur - usually due to medications or underlying heart disease - resulting in lower rates of ventricular conduction, e.g.The most common AV ratio is 2:1, resulting in a ventricular rate of ~150 bpm Ventricular rate is determined by the AV conduction ratio (“degree of AV block”).The length of the re-entry circuit corresponds to the size of the right atrium, resulting in a fairly predictable atrial rate of around 300 bpm (range 200-400) Data are from the Multiple Cause of Death Files, 1999-2017, as compiled from data provided by the 57 vital statistics jurisdictions through the Vital Statistics Cooperative Program.Atrial flutter is a form of supraventricular tachycardia caused by a re-entry circuit within the right atrium. Multiple Cause of Death 1999-2017 on CDC WONDER Online Database, released December 2018. Centers for Disease Control and Prevention, National Center for Health Statistics.Heart Disease and Stroke Statistics-2022 Update: A Report From the American Heart Association. ![]()
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