Stellate Ganglion Morphine Infiltration on Myocardial Ischemia-Reperfusion Injury

The goal of this clinical trial is to investigate whether morphine modulates the functions of the stellate ganglion to reduce myocardial ischemia/reperfusion injury in AMI patients. It will also assess the safety of injecting morphine around the stellate ganglion via ultrasound guidance. The main questions it aims to answer are: 1. Does morphine regulate stellate ganglion function to reduce myocardial ischemia/reperfusion injury in AMI patients? 2. What medical problems do participants experience when receiving injected morphine around the stellate ganglion? Researchers will compare morphine to a placebo saline (as a control group) to determine whether stellate ganglion infiltration with morphine effectively treats patients with AMI following primary PCI. Participants will: * Receive a single injection of morphine or saline around the stellate ganglion. * Evaluate the percentage of infarct size 7 days after surgery, or at discharge if the duration is shorter than 7 days. * Record their symptoms and any major adverse cardiovascular and cerebrovascular events within 30 days post-surgery.