Going nuclear
Doug
If we're treading on thin ice we might as well dance.--Jesse Winchester


Michael,
It is a good thing that you have a cardiologist that is going to make sure your heart is in the best possible shape prior to have anesthesia. General anesthesia puts a lot a stress on a person's heart, so you want to have whatever medications that will help reduce these stresses in your system prior to surgery (if necessary).
The Stress test can be done in several ways. A plain old exercise stress test is they hook you up like they did for the electrocardiogram and get you on a treadmill and keep making you walk faster and at a higher incline until your heart rate reaches 80% of you maximum predicted value (I can't remember the calculation but it is something like 200 - your age * .8 or in the 140's for a 45 year old guy). The Nuclear part comes in when they inject a nuclear tracer into your blood near the end of the test. The idea is that the tracer gets taken to all the parts of the heart that blood is reaching, so when they take pictures with a special camera to "photographs" where the tracer is reaching, they will see where blood is reaching in the heart (hopefully everywhere indicated no blockages in the arteries that supply blood to the heart). If there are areas that are showing reduced blood flow, the pictures the next day will indicate that blood was getting through when the heart is at a normal rate, often referred to as reperfusion. For people who can not walk on the treadmill, they can inject a medication that will speed up the heart to the required rate to get the EKG and pictures.
Good luck, let us know how things work out.
Jim