Segmental asynergy is almost always demonstrated (in more than 90.5 per cent of cases) by means of two-dimensional ultrasonography in the acute phase of myocardial infarction. However, the value of 2D ultrasonography is not limited to this very high level of diagnostic sensitivity. In fact, the degree of asynergy, evaluated by the semi-quantitative method of ventricular scores, provides a sensitive and specific index in the prediction of intra-hospital complications (shock, death, severe arrhythmias), even before the haemodynamic data. Furthermore the asynergy of the segments situated at a distance from the infarction also constitute a valuable pejorative prognostic index in the prediction of intra- and extra-hospital complications. The excellent prognostic value of two-dimensional ultrasonography, together with its diagnostic value, justifies its routine use in coronary intensive care units.