Question: how to calculate ventricular rate in atrial flutter?
Answer: 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). Ventricular rate is determined by the AV conduction ratio (“degree of AV block”). The commonest AV ratio is 2:1, resulting in a ventricular rate of ~150 bpm.