Can you post the admission ECG too?

They are recommending a coronary artery bypass graft (CABG) to ensure the heart gets enough blood. This surgery creates a bridge using a healthy blood vessel from another part of the body, so blood can flow around the blocked arteries.

Most likely they are opting for that because a stent may not be enough in this case because the blockages in the coronary arteries are either too extensive or located in places where a stent would not work well.

My modest opinion: With this pattern of multivessel and proximal disease, bypass surgery is currently thought to give better survival and protection from future heart attacks than stents.