2 UNUSUAL COMPLICATIONS AFTER SURGICAL INTERRUPTION OF AN ACCESSORY PATHWAY

In a patient with the Wolff-Parkinson-White syndrome, Ebstein's anomal y of the tricuspid valve, a right atrial Chiari net and a patent foram en ovale two unusual complications developed after surgical epicardial dissection combined with cryoablation of the anomalous pathway. The f irst complication was that ablation of the right atrial wall led to ch anges in interatrial pressure gradients and the development of a right to left shunt necessitating surgical closure of the atrial septal def ect. The second complication was the development of a thrombotic mass in the Chiari net simulating on intracavity tumour, which also had to be removed surgically.