At this point in time, performing the surgery promptly is enough to save the dying myocardial cells, so that the patient's heart function is not fatally affected.
Otherwise, regardless of whether it's a large-scale myocardial infarction, if myocardial cells die, it will result in a multitude of irreversible cardiac function sequelae, such as permanent heart failure due to cardiac scars and restructuring of the heart structure, and symptoms caused by atrioventricular conduction block irregular heartbeats which can severely impact the patient's work, leaving the patient struggling for a lifetime.
