How does cardiac resynchronization therapy (CRT) work?
In the normal heart, the electrical conduction system delivers electrical impulses to the left ventricle in a highly organized pattern of contractions that pump blood out of the ventricle very efficiently. In some patients with heart failure, this electrical coordination is lost. Uncoordinated heart muscle function leads to inefficient ejection of blood from the ventricles. CRT devices pace both the left and right ventricles simultaneously to resynchronize the muscle contraction and improve the efficiency of the weakened heart.
