The diagnosis of blunt cardiac injury is often difficult to make because of the multiple associated injuries, the lack of specific physical findings, and the lack of sensitivity and specificity of the electrocardiograms and enzyme changes. The two-dimensional echocardiogram and the monitoring of filling pressures and cardiac indexes by pulmonary artery catheterization have an advantage over the electrocardiogram, CPK isoenzymes and technetium pyrophosphate scans because both anatomic and functional data are obtained, data are rapidly available, and the tests can be used repeatedly at the bedside.