Which arrhythmia is characterized by a rapid but regular rhythm originating from the atria?

Which arrhythmia is characterized by a rapid but regular rhythm originating from the atria?

• A. Atrial fibrillation
• B. Atrial flutter
• C. Ventricular tachycardia
• D. Sinus tachycardia

Answer: (B)

Atrial flutter is characterized by a rapid but regular rhythm that originates from the atria. In this arrhythmia, there is a reentrant circuit typically in the right atrium, leading to rapid atrial rates, often around 240 to 340 beats per minute. Unlike atrial fibrillation, which has an irregular rhythm, atrial flutter maintains a consistent and regular rhythm. The P waves in atrial flutter appear as "sawtooth" patterns, commonly referred to as "F-waves," which can be easily distinguished on an electrocardiogram (ECG). This regularity is crucial for the identification of atrial flutter and differentiates it from other arrhythmias such as atrial fibrillation, where the rhythm is irregular; ventricular tachycardia, which originates from the ventricles and typically presents with a much faster and irregular pattern; and sinus tachycardia, which is an accelerated heart rate originating from the sinoatrial node but maintains the normal sinus rhythm, thus lacking the characteristic atrial reentry involved in atrial flutter.

Atrial flutter is characterized by a rapid but regular rhythm that originates from the atria. In this arrhythmia, there is a reentrant circuit typically in the right atrium, leading to rapid atrial rates, often around 240 to 340 beats per minute. Unlike atrial fibrillation, which has an irregular rhythm, atrial flutter maintains a consistent and regular rhythm. The P waves in atrial flutter appear as "sawtooth" patterns, commonly referred to as "F-waves," which can be easily distinguished on an electrocardiogram (ECG).

This regularity is crucial for the identification of atrial flutter and differentiates it from other arrhythmias such as atrial fibrillation, where the rhythm is irregular; ventricular tachycardia, which originates from the ventricles and typically presents with a much faster and irregular pattern; and sinus tachycardia, which is an accelerated heart rate originating from the sinoatrial node but maintains the normal sinus rhythm, thus lacking the characteristic atrial reentry involved in atrial flutter.