Pediatric Electrophysiology Flashcards

Which of the following is the most common congenital arrhythmia in children?

Answer: Supraventricular tachycardia (SVT)

Supraventricular tachycardia (SVT) is the most frequently encountered congenital arrhythmia in the pediatric population. It involves rapid heart rates originating from above the ventricles, often due to re-entry circuits or abnormal automaticity. While many cases are benign and self-limiting, some may require intervention to prevent complications.

What is the primary characteristic of Long QT Syndrome (LQTS) in children?

Answer: Prolonged QT interval on the ECG

Long QT Syndrome (LQTS) is a genetic heart condition characterized by a prolonged QT interval on an electrocardiogram (ECG), which represents the time it takes for the heart's ventricles to depolarize and repolarize. This extended repolarization phase makes the heart more susceptible to developing life-threatening arrhythmias, particularly Torsades de Pointes, which can lead to sudden cardiac arrest.

Which of the following is a key consideration when performing an electrophysiology study (EPS) on a pediatric patient?

Answer: The use of general anesthesia

Performing an electrophysiology study (EPS) on pediatric patients often requires the use of general anesthesia. Children, especially younger ones, may not be able to remain still or cooperate for the extended duration of the procedure, which involves inserting catheters and inducing arrhythmias. General anesthesia ensures patient comfort, safety, and the ability to obtain accurate diagnostic information.

In pediatric patients with Wolff-Parkinson-White (WPW) syndrome, which type of arrhythmia is most commonly observed?

Answer: Atrioventricular reentrant tachycardia (AVRT)

In pediatric patients with Wolff-Parkinson-White (WPW) syndrome, the most common arrhythmia observed is atrioventricular reentrant tachycardia (AVRT). This arrhythmia occurs due to a re-entry circuit involving the normal AV nodal pathway and the accessory pathway. The electrical impulse travels rapidly through this circuit, causing the heart to beat very fast.

What is the most appropriate initial treatment for a hemodynamically stable pediatric patient with SVT?

Answer: Vagal maneuvers

For hemodynamically stable pediatric patients experiencing supraventricular tachycardia (SVT), vagal maneuvers are the most appropriate initial treatment. These non-invasive techniques, such as ice to the face or Valsalva maneuver, stimulate the vagus nerve, which can slow the heart rate and potentially terminate the SVT by increasing AV nodal block. If vagal maneuvers are unsuccessful, pharmacological interventions like adenosine may be considered.