<prompt> What is the best treatment for the new-onset atrial flutter?CardioversionProcainamideBretyliumAmiodarone  <response>: Recent-onset atrial flutter: Electrical cardioversion of low-intensity 25-50 J can conve 90 of patients into normal sinus rhythm and is most effective therapy. In atrial flutter usage of class I agentsProcainamide will lead to the slowing of atrial flutter to a point where 1:1 conduction will occur and hea rate can jump up to 200 bpm leading to hemodynamic compromise. Ibutilide: 1 mg infusion over 60 minutes will work in 50-70 of patients reveing them to normal sinus rhythm. However, it is not given in the choices. Recurrent atrial flutter: Anti-arrhythmic drugs like sotalol, amiodarone can be used but 70 will experience recurrence. In this situation catheter ablation at cavotricuspid isthmus is more effective. 