A 72-year-old woman presents with 3 days of fatigue and palpitations. Vital signs show BP 135/82 mmHg, HR 130/min, RR 18/min, temp 37.2°C, SpO2 98% on room air. ECG demonstrates atrial fibrillation with ventricular rate of 130/min. Troponin is normal. She denies chest pain or dyspnea. Currently takes metoprolol but reports poor adherence. Which of the following is the best initial pharmacologic goal?
- A)Slow conduction through the AV nodeGABARITO
- B)Increase sinus node discharge
- C)Stimulate alpha-1 receptors
- D)Block conduction through an accessory pathway
- E)Prolong ventricular repolarization in all patients
Explicação
In stable atrial fibrillation without preexcitation, initial therapy often focuses on ventricular rate control by slowing AV nodal conduction. Beta blockers and nondihydropyridine calcium channel blockers are common first-line options because the AV node deter... Ver explicação completa e trilha adaptativa →