Up‐to‐date cardiac resynchronization therapy

Cardiac resynchronization therapy (CRT) has been first reported more than 10 years ago as a therapy for patients with severe chronic heart failure. The efficacy of CRT has been proven in many studies that it improves not only quality of life but also the prognosis of the patients. Its indication has been expanded for patients with mild heart failure. On the other hand, some patients cannot receive enough benefit through CRT. The position of the left ventricular lead is limited due to the anatomy of coronary sinus branches, pacing threshold of the myocardium, phrenic nerve stimulation, and so on. Also, the right selection of the candidates for CRT is critical to receive the most benefit of this therapy. The target of this review article is to describe the efficacy and the indication of CRT, which can be of any help to enroll more patients with heart failure who are likely to get benefits through CRT.