Suggest Treatment For Chest Pressure And Erratic Heart Rate

My uncle has been in the ICU for nearly 24 hours with chest pressure, erratic heart rate 135 to 90bpm, atrial fibrillation, and his enzyme levels keep increasing and are now over 18 from 2.5 last evening. They say they are going to do an angiogram and possibly transfer him to do open heart. They are giving him meds and have the "a fib" under control but arent moving to do the heart surgery until tomorrow. They say he has had a at least "heart incidents" since yesterday morning, with his enzymes continually increasing and he appears to be worse now than when he went into ICU, why would they hold off until Monday morning rather than continuing to let his heart muscle be more damaged? And why can't they stop further damage?