What is a benefit of morphine when given for the management of ACS?

• A. Central nervous system analgesia
• B. Venodilation
• C. Alleviates dyspnea
• D. Helps redistribute blood volume

Answer: (A)

Morphine’s primary benefit in ACS is CNS analgesia. By acting on mu-opioid receptors in the brain and spinal cord, it relieves the ischemic chest pain and the associated anxiety. This pain relief reduces sympathetic drive, which lowers heart rate and blood pressure, helping to decrease myocardial oxygen demand. While morphine can also cause venodilation and may ease dyspnea as secondary effects, the most consistent and impactful benefit is its ability to alleviate pain through central analgesia.