Hi Granbonny,
Some of the words you are wondering about are describing aspects of your surgery that addressed the aorta as well as the aortic valve. Your aortic valve, root, ascending aorta, and part of the arch (hemiarch) were all replaced using a Dacron graft with the St Jude valve attached to it. Your coronary arteries were attached to the Dacron graft. This procedure is called Bentall, named after the doctor that first performed it. While this was being done, they did some special things to protect you and especially your brain, such as making you extra cold (deep hypothermia). The web site I mentioned earlier on this thread will give you some additional information about this kind of surgery.
I'm so glad that all is going well for you!
Take care,
Arlyss