Why is morphine useful in acute coronary syndrome?

Why is morphine useful in acute coronary syndrome?

• A. Increases heart rate and blood pressure
• B. Causes vasodilation of coronary arteries
• C. Reduces cholesterol
• D. Decreases pain and myocardial oxygen demand

Answer: (D)

In acute coronary syndrome, the heart’s oxygen supply is already stressed, so anything that lowers its oxygen demand helps relieve ischemia. Morphine primarily achieves this by relieving the severe chest pain and anxiety of ischemia, which reduces sympathetic drive. Less sympathetic stimulation means the heart rate and blood pressure tend to fall, and the heart does not have to work as hard, so myocardial oxygen consumption decreases. Additionally, morphine causes venodilation, which lowers preload and the stress on the heart wall, further reducing oxygen demand. This combination—pain relief plus reduced wall tension—helps ease ischemia and patient comfort. It isn’t about lowering cholesterol acutely, and it doesn’t purposefully increase blood pressure; its main benefit in this setting is the drop in myocardial oxygen demand driven by analgesia and venous pooling.

In acute coronary syndrome, the heart’s oxygen supply is already stressed, so anything that lowers its oxygen demand helps relieve ischemia. Morphine primarily achieves this by relieving the severe chest pain and anxiety of ischemia, which reduces sympathetic drive. Less sympathetic stimulation means the heart rate and blood pressure tend to fall, and the heart does not have to work as hard, so myocardial oxygen consumption decreases. Additionally, morphine causes venodilation, which lowers preload and the stress on the heart wall, further reducing oxygen demand. This combination—pain relief plus reduced wall tension—helps ease ischemia and patient comfort. It isn’t about lowering cholesterol acutely, and it doesn’t purposefully increase blood pressure; its main benefit in this setting is the drop in myocardial oxygen demand driven by analgesia and venous pooling.