Cardiac leads are the wires that connect the heart with an implantable cardioverter/defibrillator (ICDs), such as a pacemaker. At times, a cardiac lead may need to be removed and replaced because it is not working properly, scar tissue builds up, the tissue around the lead becomes infected, or because an upgrade is necessary. Extracting the lead surgically can create complications. Laser lead extraction is a safer strategy that uses cold, carefully controlled laser energy to remove scar tissue around the lead and then extract the lead using a catheter. Laser lead extraction is performed in the cardiac cath lab.