Tissue Doppler imaging in patients with congestive heart failure and conduction disorders

Resynchronization of segmental left ventricular mechanics as well as re-coordination of both atrio-ventricular and inter-ventricular contraction are potential mechanisms responsible for the clinical benefit observed in patients with advanced congestive heart failure treated by cardiac resynchronization therapy (CRT). Initially electrical conduction problems, in the majority of cases a left bundle branch block (LBBB), were considered the target for CRT. However, growing experience with CRT in different patient populations including those with only a mild degree of conduction disturbance, and improved cardiac imaging utilizing the tissue Doppler approach have shown the complexity of CRT and the usefulness of sophisticated echocardiographic imaging techniques for therapeutic decision making. (C) 2004 Published by Elsevier Ltd on behalf of The European Society of Cardiology.