CNS Pharmacology USMLE Step 1 Practice Question
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?
Answer choices
- AIsoproterenolCorrect answer
- BNorepinephrine
- CEpinephrine at high dose
- DPhenylephrine
- EMethyldopa
- FDopamine at low dose (2-5 mcg/kg/min)
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