Left atrial appendage rupture: A rare complication of right-sided haemothorax: A case report.

Cardiac injury accounts for less than 10 % of all traumas and it is a fatal condition associated with cardiac tamponade or massive haemothorax, which requires immediate intervention, such as resuscitative thoracotomy. However, in case of haemothorax without the findings suggestive of cardiac damage such as pericardial effusion, it is difficult to determine the complications of cardiac injury, because injury of the lung or intercostal arteries is usually considered first. We describe a rare case of left atrial appendage rupture with a right-sided massive haemothorax with slight cardiac effusion. A 47-year-old man with no significant medical history was transferred to our emergency department after crashing his motorcycle into a car. A right resuscitative thoracotomy for massive haemothorax was performed, followed by hilarious clamping and pericardial drainage. We found continuous bleeding from a right dorsal pericardial injury which indicated cardiac injury. Soon after the patient was referred to the operating room, left atrial appendage rupture was found, and ligated. The postoperative course was uneventful, and he was discharged on 15th postoperative day without complication. Left atrial appendage rupture is caused by a direct external force to the left atrium, so the pericardial injury is usually ipsilateral to the left side of the pericardium, resulting in perforation of the left thoracic cavity. Therefore, left atrial appendage rupture with a right-sided massive haemothorax is rare. In addition, when a cardiac injury is associated with a pericardial injury, most of the pericardial effusion drains into the thoracic cavity, resulting in a small amount of pericardial effusion, which make it difficult to recognize the cardiac injury. In conclusion, in blunt trauma, even in the case of a right-sided haemothorax, the possibility of cardiac injury in addition to pulmonary contusion should be considered and explored, because cardiac injury could be fatal.