Wishing you best of luck, and for your father. A stent is a tube of meshwork that is placed inside an artery, which keeps the passageway open for blood flow by supporting the artery wall from inside. The American Heart Assn. has more information in this pdf
:smile-new: What is a Stent?
http://www.heart.org/idc/groups/heart-public/@wcm/@hcm/documents/downloadable/ucm_300452.pdf
and on their general website
:smile-new: AHA:
http://www.heart.org/HEARTORG/
Surgeons are pretty good at this business. Mortality in the operating room for bypasses is fairly low, in the range of 1% to 10% depending on what kind of operation and on the patient's age and condition. Expect a substantial recovery period and for doctors to insist on a new lifestyle for the patient. However, most patients can leave hospital in 1st or 2nd week afterward.
Unlike bypasses, which require opening the chest and may require stopping the heartbeat artificially while the patient is hooked up to a heart-lung machine, stents are inserted via a catheter. The patient is usually conscious under local anaesthesia, and there is no heart-lung machine. Patients often leave hospital within a day or two. Surgical mortality is very low, and recovery is faster since there are no large wounds. There will still be a lot of lifestyle changes, including prescribed amounts of exercise and no smoking if applicable.