In which condition would you most likely observe intermittent SVT episodes?

In which condition would you most likely observe intermittent SVT episodes?

• A. First degree AV block
• B. Bradycardia-tachycardia syndrome
• C. Sick sinus syndrome
• D. Sinus block

Answer: (B)

Intermittent SVT episodes are commonly associated with bradycardia-tachycardia syndrome, characterized by alternating periods of slow heart rates (bradycardia) and rapid heart rates (tachycardia), including episodes of supraventricular tachycardia (SVT). This condition often affects patients with underlying heart disease or those who have had previous heart surgeries.

In bradycardia-tachycardia syndrome, the heart's normal rhythm can be disrupted, leading to the rapid episodes of SVT that may follow bradycardia. The presence of a malfunctioning sinus node can contribute to this pattern, making it more likely for the patient to experience these intermittent episodes of rapid heartbeats, which are typical of SVT.

Other conditions mentioned do not typically feature the same pattern of intermittent rapid and slow heart rates. First degree AV block involves a delay in the conduction through the AV node without causing significant tachycardia. Sick sinus syndrome may involve periods of bradycardia, but while it can lead to tachycardia, it more often leads to arrhythmias such as atrial fibrillation or junctional rhythms rather than recurrent SVT. Sinus block usually leads to missed beats rather