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Summary Echocardiogaphy in cardiac resynchronisation therapyAn uncoordinated contraction process in patients with cardiac failure is a contributory factor in restricting haemodynamic function independently of myocardial damage at cell level. Cardiac resynchronisation therapy, usually in the form of biventricular stimulation, has brought considerable progress in the treatment of this patient population in the last few years. One difficulty that remains, however, is the selection of suitable patients. In addition to the ECG criteria of asynchronism (QRS broadening over 130-150 ms), echocardiography offers a variety of complementary approaches to quantification of the asynchronism. These are discussed here.

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