[Adults with congenital heart disease presenting to the emergency department : Potential pitfalls].

The number of adults with congenital heart disease (ACHD) already exceeds the number of children with congenital heart disease in the industrialized world. ACHD patients often show complex pathophysiology and anatomy even after reparative cardiac surgery. In case of complications patients may rapidly deteriorate and become unstable, even when they were asymptomatic or had only mild symptoms before the onset of the complication. Compared to all patients seen by emergency physicians, emergencies in ACHD patients are still rare. This review is aimed to guide management in ACHD emergency situations. Approximately two-thirds of all emergency admissions are caused by arrhythmias or acute heart failure. Sustained arrhythmias may rapidly lead to acute cardiac decompensation in ACHD patients. If medical treatment fails or patients present in hemodynamically unstable conditions, prompt electrical cardioversion is mandatory. Symptomatic bradycardia may require urgent pacemaker implantation. Depending on the underlying heart defect, placement of temporary transvenous pacemaker leads may be impossible. Acute heart failure in ACHD patients is often caused by acute right heart failure. Other more frequent emergencies are infections, syncope, thromboembolic events, and aortic dissection. It is highly recommended to contact the tertiary care center that follows the patient regularly early in case of patient presentation to the emergency room.