What is the most common type of arrhythmia, characterized by an irregular and fast heartbeat?

What is the most common type of arrhythmia, characterized by an irregular and fast heartbeat?

• A. Tachycardia
• B. Bradycardia
• C. Arrhythmia
• D. Atrial fibrillation

Answer: (D)

Atrial fibrillation is the most common arrhythmia that presents with an irregular and often rapid heartbeat. This condition happens when the atria beat in a chaotic, disorganized way, so the impulses sent to the ventricles arrive in a way that makes the ventricular rate irregular and frequently fast. That irregularity—an irregularly irregular rhythm—along with a tendency toward a quick rate is the hallmark that sets it apart from other rhythms. Tachycardia refers to a fast heart rate but can be a regular rhythm (like sinus tachycardia) and isn’t defined by irregular timing. Bradycardia means a slow heart rate. A general “arrhythmia” is a broad term for any abnormal rhythm and doesn’t specify the irregularity with a fast rate. So, the description best fits atrial fibrillation.

Atrial fibrillation is the most common arrhythmia that presents with an irregular and often rapid heartbeat. This condition happens when the atria beat in a chaotic, disorganized way, so the impulses sent to the ventricles arrive in a way that makes the ventricular rate irregular and frequently fast. That irregularity—an irregularly irregular rhythm—along with a tendency toward a quick rate is the hallmark that sets it apart from other rhythms.

Tachycardia refers to a fast heart rate but can be a regular rhythm (like sinus tachycardia) and isn’t defined by irregular timing. Bradycardia means a slow heart rate. A general “arrhythmia” is a broad term for any abnormal rhythm and doesn’t specify the irregularity with a fast rate. So, the description best fits atrial fibrillation.