1.   The tiny device is surgically implanted in an outpatient procedure within the eye, just outside the field of vision.

2.   And implanting the device no longer requires chest surgery.

3.   But technical problems in implanting the devices may also be an important reason in limiting use of the larger, more sophisticated devices in smaller people such as women.

4.   But technical problems in implanting the devices may also be an important reason.

5.   Even the specialists who implant the devices, electrophysiologists, are in short supply.

6.   FDA reviewers also said they were concerned about the potential for mechanical failure and other complications in surgery for implanting the device.

7.   If the electrophysiologic tests show he has such a risk, then the doctors will immediately implant a device designed to slow dangerously fast heart rhythms.

8.   In his press conference, Cheney suggested that his doctors would probably implant the device regardless of which group he fell in.

9.   In the technique, a device is implanted in the abdomen and electrical leads are threaded through veins to the heart.

10.   McCallum and researchers in Tennessee will implant the devices in several dozen more patients before seeking FDA approval for their general use.