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In the past, myocardial contusions after blunt thoracic trauma have been frequently overlooked or missed unless hemodynamic instability or dramatic electrocardiographic findings were observed. We now know that this entity is more common than once believed. However, our understanding of cardiac contusions remains unclear and obscure because of the inability to diagnose the condition accurately. Chest roentgenograms, electrocardiograms, and radionuclide imaging have had less than optimal success. We believe that the serial determination of creatine phosphokinase-myocardial band isoenzymes and subsequent two-dimensional echocardiographic sector scanning are the most sensitive indicators of structural and functional cardiac injury presently available.