According to MedlinePlus, a heart contusion, or myocardial contusion, is a bruise of the heart muscle. Commonly, myocardial contusions occur after a car crash, as a result of cardiopulmonary resuscitation or after falling from a tall height.
Myocardial contusions present a variety of symptoms, including pain, the feeling of the heart racing, light-headedness, nausea, shortness of breath and weakness, states MedlinePlus. A patient who experiences these symptoms may need tests, such as a chest X-ray, CT scan of the chest or echocardiogram, to see if he is suffering from a myocardial contusion. A patient who tests positive for a myocardial contusion may need a chest tube, a pacemaker or various medications to control pain and heart rhythm.