What is bradycardia-tachycardia syndrome?

What is bradycardia-tachycardia syndrome?

• A. Consistent bradycardia without episodes of tachycardia
• B. Intermittent episodes of supraventricular tachycardia mixed with sinus bradycardia
• C. Only episodes of atrial fibrillation
• D. Constant tachycardia without any bradycardia

Answer: (B)

Bradycardia-tachycardia syndrome refers to a condition characterized by intermittent episodes of supraventricular tachycardia (SVT) alternating with periods of sinus bradycardia. This syndrome occurs when the heart rate fluctuates between abnormally slow rates (bradycardia) and abnormally fast rates (tachycardia). The mechanisms behind this condition often involve underlying issues with the heart's electrical conduction system, particularly the sinus node, which controls heart rhythm.

In bradycardia-tachycardia syndrome, patients may experience symptoms related to both bradycardia and tachycardia, such as dizziness, palpitations, or syncope. The alternating nature of the rhythms is key to understanding the syndrome, as it differentiates it from conditions that present solely with consistent bradycardia or tachycardia.

The correctness of this answer lies in the definition of the syndrome: the presence of both types of arrhythmia in a recurring pattern distinguishes it from other heart rhythm disorders.