A 28-year-old man with Wolff-Parkinson-White syndrome presents with episodic palpitations and is found to have antidromic atrioventricular reentrant tachycardia. Vital signs: BP 128/82 mmHg, HR 160 bpm, RR 16, Temp 37°C, SpO2 98% on room air. He is hemodynamically stable with no prior syncope. ECG shows a wide QRS complex with antidromic conduction. Which intravenous agent prolongs action potential duration and refractory period in atrial and ventricular myocardium?
- A)Digoxin
- B)Verapamil
- C)ProcainamideGABARITO
- D)Atropine
- E)Adenosine only because it increases AV nodal conduction
Explicação
Procainamide is a class IA antiarrhythmic that blocks sodium channels and also prolongs repolarization by increasing action potential duration. In stable Wolff-Parkinson-White tachyarrhythmias, it is useful because it slows conduction through accessory pathway... Ver explicação completa e trilha adaptativa →