A 58-year-old man undergoes open-heart surgery for a triple coronary artery bypass graft. His surgery goes smoothly, but the next day he develops chest palpitations. Metoprolol is started to keep his supraventricular tachycardia from interfering with ventricular rhythm. Under which Singh-Vaughan Williams class of antiarrhythmics does metoprolol fall?

A 58-year-old man undergoes open-heart surgery for a triple coronary artery bypass graft. His surgery goes smoothly, but the next day he develops chest palpitations. Metoprolol is started to keep his supraventricular tachycardia from interfering with ventricular rhythm. Under which Singh-Vaughan Williams class of antiarrhythmics does metoprolol fall?

Five pregnant women with hypertension present to the obstetrics clinic for follow-up. Which patient is in need of treatment with an antihypertensive agent?

Prostacyclin (epoprostenol):

A diabetic hyperlipidemic patient recently developed hypertension. Which antihypertensive combination of the following is the most suitable for him: