396. Describe the P waves in sinus tachycardia / When a beta blocker is indicated in sinus tach / Ddx sinus tach July 6th, 2008 by reuben in arrhythmia Back Top Tags: card 395. What is parasystole? / What is pseudotachycardia? / Ddx irregularly irregular rhythm 397. Describe atrial tachycardia / Paroxysmal atrial tachycardia / Multifocal atrial tachycardia (etiologies, treatment) Leave a Reply Cancel reply Please post any discussion to the emupdates Reddit page.