Cardiac resynchronization therapy (CRT) has been shown to be highly efficacious in the treatment of congestive heart failure in patients with a wide QRS. Achieving successful left ventricular lead placement is the key step in achieving successful CRT. Leads have been developed that reduce the possibility of lead dislodgement after implantation. Lead technology has been developed that allows for the reprogramming of the stimulation vector so that phrenic nerve stimulation can be avoided while successful resynchronization therapy is maintained. Implantation tools have been developed that help achieve successful CRT implantation.