What is the role of vasopressors in acute coronary syndrome?

• A. They constrict blood vessels to increase blood pressure
• B. They dilate coronary arteries to improve perfusion
• C. They directly decrease heart rate
• D. They anticoagulate the blood

Answer: (A)

In ACS, the goal is to keep enough perfusion pressure so the ischemic myocardium still receives oxygen. Vasopressors achieve this by causing vasoconstriction through alpha-adrenergic stimulation, which raises systemic vascular resistance and mean arterial pressure. This helps improve coronary perfusion pressure, especially when blood pressure is critically low, and supports organ and myocardial perfusion during a dangerous state.

They don’t primarily open or dilate the coronary arteries—that would be done with nitrates or other vasodilators. They also don’t directly slow the heart; in fact, they often increase heart rate and contractility, which can raise myocardial oxygen demand. And they are not anticoagulants; those medications target clot formation or blood viscosity. Use must be carefully titrated because excessive vasoconstriction can raise afterload and worsen ischemia. Monitor blood pressure, heart rate, urine output, and perfusion indicators to balance benefits with potential risks.