There are two types of CRT-

1) Cardiac Resynchronization Therapy Pacemaker (CRT-P)

  • This device functions only as a pacemaker.
  • It sends a mild electrical pulse to regulate the rate of ventricular contractions and restores a coordinated pumping action.
  • It is an option for people who are not at high risk of developing life-threatening arrhythmias such as ventricular tachycardia.

2) Cardiac Resynchronization Therapy Defibrillator (CRT-D)

  • This device combines a pacemaker and defibrillator in one device.
  • It synchronizes the contractions of the ventricles like a CRT-P but it also senses and corrects dangerous arrhythmias that can develop in the ventricles.
  • CRT-D may be right for people who are at a high risk of developing ventricular arrhythmias that may sometimes lead to sudden cardiac arrest or sudden cardiac death.  

Reference : Cardiac Resynchronization Therapy. (n.d.). Retrieved from