Question: is afib and sinus tachycardia the same?
Answer: Sinus tachycardia must be distinguished from other, regular narrow-complex tachycardias, such as accelerated junctional rhythm and atrial flutter with 2:1 block. The presence of regular P waves and a normal PR interval suggests sinus tachycardia, whereas a long PR interval suggests atrial flutter with 2:1 block.