Final answer:
Atrial flutter is the dysrhythmia with an atrial rate between 250 and 400 and saw-toothed P waves, as opposed to atrial fibrillation, ventricular tachycardia, and ventricular fibrillation which have different ECG presentations.
The correct answer is options 1.
Step-by-step explanation:
The dysrhythmia with an atrial rate between 250 and 400, featuring saw-toothed P waves, is known as atrial flutter. This type of arrhythmia is characterized by rapid, regular atrial depolarizations at a rate of typically 250 to 400 times per minute.
The saw-toothed appearance on an electrocardiogram (ECG) is due to the reentrant circuit in the atria causing the atria to contract quickly and regularly. Not to be confused with atrial fibrillation, which has an irregularly irregular rhythm and no discernible P waves, or ventricular tachycardia and ventricular fibrillation, both of which originate in the ventricles and have different ECG characteristics. So, The correct answer is options 1.