A CRT-P is an implantable cardiac resynchronization therapy (CRT) pacemaker for patients with heart failure . The device monitors the heart's rhythm, detects irregularities and corrects them with electrical impulses. CRT-Ps differ from other implantable pacemakers in that they help your heart’s lower chambers – the ventricles – work in tandem. To do this, CRT-Ps have three leads – wires that deliver energy to the heart – rather than one or two, as in other pacemakers. \nCRT-Ps enhance the heart’s effectiveness and increase blood flow. They improve heart failure symptoms like fatigue, shortness of breath and exercise intolerance. Cardiac resynchronization therapy significantly lowers the risk of life-threatening cardiac events. Many patients’ quality of life improves significantly with a CRT-P. Surgery is necessary to implant a CRT-P.