A 64-year-old man with acute anterior wall myocardial infarction presents with frequent premature ventricular contractions. Vital signs show BP 118/76 mmHg, HR 102/min, RR 18/min, and SpO2 98% on room air. Troponin I is elevated at 8.2 ng/mL. Chest X-ray shows no pulmonary edema. He denies prior arrhythmias and takes no antiarrhythmic medications. Which antiarrhythmic preferentially binds ischemic ventricular tissue while minimally affecting atrial tissue?
- A)Procainamide
- B)Adenosine
- C)LidocaineGABARITO
- D)Verapamil
- E)Amiodarone
Explicação
Lidocaine is a class Ib antiarrhythmic that binds preferentially to inactivated sodium channels in ischemic or depolarized ventricular tissue. It is used mainly for ventricular arrhythmias, particularly in the setting of ischemia. Ver explicação completa e trilha adaptativa →