A 22-year-old woman develops sudden palpitations while studying. Vitals: BP 118/76, HR 190, RR 18, Temp 37°C, SpO2 98% on room air. She remains hemodynamically stable with normal mental status. ECG reveals a regular narrow-complex tachycardia at 190 bpm with no visible delta waves. Serum electrolytes and troponin are normal. Vagal maneuvers and adenosine-resistant attempts fail to terminate the episode. Which medication most effectively acutely terminates this arrhythmia?
- A)Procainamide
- B)Epinephrine
- C)Atropine
- D)Magnesium sulfate
- E)AdenosineGABARITO
Explicação
Adenosine is first-line acute therapy for stable AV node-dependent paroxysmal supraventricular tachycardia. It transiently blocks AV nodal conduction through A1 receptor activation and can terminate AVNRT or orthodromic AVRT. Ver explicação completa e trilha adaptativa →