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

2.   Leads are threaded through a vein into the heart.

3.   Pacemaker leads are threaded intravenously through a catheter down into the heart, and open-chest surgery is not required.

4.   It is installed under the skin in the upper chest and wire leads are threaded through vessels into the heart chambers.