In a patient with a history of coronary artery disease who presents with hypotension and tachycardia, which medication is indicated?

In a patient with a history of coronary artery disease who presents with hypotension and tachycardia, which medication is indicated?

• A. Atropine
• B. Dobutamine
• C. Dopamine
• D. Phenylephrine

Answer: (D)

In a patient presenting with hypotension and tachycardia, particularly with a history of coronary artery disease, the choice of medication hinges on their hemodynamic status. Phenylephrine is a selective alpha-1 adrenergic agonist that primarily causes vasoconstriction, leading to an increase in systemic vascular resistance and, consequently, increased blood pressure. This characteristic makes it particularly useful in managing hypotension without significantly increasing heart rate, which is critical in patients who may be tachycardic and could have an underlying risk for myocardial ischemia due to coronary artery disease. In contrast, while other options such as dopamine and dobutamine can increase cardiac output, they may also increase heart rate, which could exacerbate the tachycardia already present in the patient. Atropine, being an anticholinergic agent, increases heart rate but does not directly address the hypotension. Using an agent that raises blood pressure without further stressing the heart is a priority in this clinical setting, hence the appropriateness of phenylephrine.

In a patient presenting with hypotension and tachycardia, particularly with a history of coronary artery disease, the choice of medication hinges on their hemodynamic status. Phenylephrine is a selective alpha-1 adrenergic agonist that primarily causes vasoconstriction, leading to an increase in systemic vascular resistance and, consequently, increased blood pressure. This characteristic makes it particularly useful in managing hypotension without significantly increasing heart rate, which is critical in patients who may be tachycardic and could have an underlying risk for myocardial ischemia due to coronary artery disease.

In contrast, while other options such as dopamine and dobutamine can increase cardiac output, they may also increase heart rate, which could exacerbate the tachycardia already present in the patient. Atropine, being an anticholinergic agent, increases heart rate but does not directly address the hypotension. Using an agent that raises blood pressure without further stressing the heart is a priority in this clinical setting, hence the appropriateness of phenylephrine.