Heart Rhythm Disorders - University of Minnesota Physicians Heart at Fairview

Cardiac Resynchronization Therapy

CRT—cardiac resynchronization therapy—is bi-ventricular ICD, another form of implantable cardioverter defibrillator. CRT is a newer version of ICD, costs more, is larger in size and lasts about two years less than the regular ICD. With 2-3 leads rather than 1-2 leads going into the heart, the implantation procedure for CRT is more complicated.

The additional lead in the CRT is for left ventricular pacing to improve the coordination of ventricular contraction and, therefore, the efficiency of the heart’s pumping function.
In addition to the standard indications for ICD implantation, a patient must meet two additional criteria for CRT: 1) persistent symptoms of heart failure despite optimal medical therapy, and 2) evidence of uncoordinated contraction of the ventricle.

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