A 55-year-old man presents with an inferior wall myocardial infarction complicated by symptomatic bradycardia. Vital signs show BP 88/56 mmHg, HR 42 bpm, RR 16, temp 37°C, SpO2 98%. ECG demonstrates ST elevation in leads II, III, aVF. Troponin I is elevated at 4.2 ng/mL. He denies chest pain currently. While arranging transvenous pacing, which drug provides inotropic and chronotropic support via nonselective beta-agonism without direct alpha-1 mediated vasoconstriction?
- A)IsoproterenolGABARITO
- B)Norepinephrine
- C)Epinephrine at high dose
- D)Phenylephrine
- E)Methyldopa
Explicação
Isoproterenol is a nonselective beta agonist that increases heart rate through beta-1 stimulation and can produce some vasodilation through beta-2 activity. Because it lacks alpha-1 agonism, it does not primarily increase peripheral vascular resistance. That p... Ver explicação completa e trilha adaptativa →