Relief of cardiac tamponade by a congenital partial left-sided pericardial defect in a patient with ruptured acute type A aortic dissection: a case report.

BACKGROUND: Acute type A aortic dissections have an extremely poor prognosis, and cardiac tamponade is a major cause of death in these patients. Here, we describe a case where congenital partial pericardial defect relieved cardiac tamponade caused by ruptured type A aortic dissection. CASE PRESENTATION: A 79-year-old woman was hospitalized after experiencing chest pains and respiratory distress. She developed out-of-hospital cardiopulmonary arrest and was resuscitated with no sequelae 5 days before admission. Computed tomography confirmed pericardial and left pleural effusions, and type A aortic dissection was diagnosed. We began emergency ascending aortic replacement surgery under general anesthesia with propofol and remifentanil and incidentally discovered a congenital partial left-sided pericardial defect that allowed drainage of the hemopericardium and relieved cardiac tamponade. The surgery was successfully performed, and the patient recovered without complications. CONCLUSIONS: We experienced an extremely rare case where a congenital partial pericardial defect relieved cardiac tamponade associated with aortic dissection and contributed to the patient's survival.