What considerations are important for anesthesia in patients with coronary artery disease?

• A. Maintain tachycardia and allow hypotension to improve coronary perfusion.
• B. Allow hypotension to decrease oxygen demand.
• C. Maintain stable heart rate, avoid tachycardia and hypotension, optimize myocardial oxygen supply-demand balance and hemodynamic stability.
• D. Use high-dose vasodilators to guarantee perfusion.

Answer: (C)

In coronary artery disease, the goal of anesthesia is to keep the heart’s oxygen supply–demand balance stable by maintaining normal heart rate and stable blood pressure. Diseased coronary arteries limit blood flow, so the heart relies on adequate diastolic perfusion and a low, steady oxygen demand. Tachycardia shortens diastole and raises myocardial oxygen consumption, while hypotension reduces the driving pressure that feeds coronary flow. Together, these stresses increase the risk of myocardial ischemia during the perioperative period.

Therefore, the best approach is to keep heart rate within normal limits, avoid tachycardia and hypotension, and maintain hemodynamic stability to optimize the balance between oxygen supply and demand. This includes ensuring good oxygenation and hematocrit, avoiding large swings in preload or afterload, preventing pain and sympathetic surges, and using anesthesia techniques that minimize increases in myocardial oxygen demand. High-dose vasodilators that drop blood pressure can worsen coronary perfusion, so they are not desirable as a blanket strategy.

In short, steady heart rate, stable blood pressure, and careful management of oxygen delivery and myocardial demand best protect a patient with coronary artery disease during anesthesia.