Past, present and future of cardiac resynchronization.

The growing interest in dyssynchrony and cardiac resynchronization therapy has opened the field of cardiac stimulation to new haemodynamic indications. French investigators have played a key role in the formulation of new concepts, all arising from clinical observations, and the development (in collaboration with industry) and clinical evaluation of resynchronization devices. This review summarizes recent knowledge and perspectives pertaining to atrial, atrioventricular and ventricular dyssynchrony and resynchronization. Some of these concepts have been validated by robust clinical evidence, on the basis of which scientific recommendations have been formulated. Other concepts have been less successful but probably merit further attention.