A 24-year-old woman comes to the clinic because of recurrent episodes of sudden-onset palpitations that stop abruptly after she bears down or splashes cold water on her face. She is otherwise healthy. During an episode, ECG shows a regular narrow-complex tachycardia at 190 per minute without clearly visible P waves. Which of the following is the most likely mechanism of this arrhythmia?
- A)Reentry within dual AV nodal pathwaysGABARITO
- B)Accessory pathway from atrium to ventricle
- C)Enhanced sinus node discharge
- D)Triggered activity due to prolonged QT interval
- E)Automaticity from multiple atrial foci
Explicação
This presentation is classic for AV nodal reentrant tachycardia. A reentry circuit forms within fast and slow AV nodal pathways, producing sudden paroxysms of regular narrow-complex tachycardia that often terminate with vagal maneuvers or adenosine. Ver explicação completa e trilha adaptativa →