What is a "gastric pacemaker"?

I am scheduled to have a HIDA Scan Sept 2,008 does the camera coverjust the abdomen or is it over more of the body? I have been diagnosed with Gallstones and sludge and told that my gallbladder must be removed already; and, so why else would I have a HIDA scan ordered?  Also, one surgeon wants me to be evaluated for insertion of a "gastric pacemaker" for sluggish GI emptying. Does anyone out there know anything about a "Gastric Pacemaker"?
                                                      grannydee16

[CalGal]

The HIDA scan is used to see just how much bile you're putting out and the scan typically just covers the area of the gallbladder and common bile duct. They use the HIDA scan to verify that the gallbladder is 'sluggish.'

A gastric pacemaker isn't used for a sluggish gallbladder. It's used to try to speed up emptying from the stomach. They're kind of like heart pacemakers - trying to keep the organ functionng properly. The gastric pacemakers help some people, not all. And some with gastric pacemakers need to continue to take medication to help their 'sluggish' stomach move food though.