Cyanosis after surgical closure of atrial septal defect

Abstract

We present the case of a 12-year-old boy treated for a secundum atrial septal defect (sASD) at the age of 2 years who was referred due to dyspnea, cyanosis with digital clubbing, and oxygen desaturation of 75%. Transthoracic echocardiogram showed an acceleration of flow of the inferior vena cava (IVC) inside the right atrium (RA) due to an iatrogenic suture between the Eustachian valve and the upper part of the ASD, with residual right-to-left shunt. Subsequently, a transesophageal echocardiogram and cardiac catheterization (figure 1, arrows) with cavogram revealed the severe obstruction of the IVC drainage into the RA through a 6 mm orifice, with a 12 mm IVC diameter, and a residual 5 mm ASD, leading to a right-to-left shunt (videos 1-3 of the supplementary data). Figure 1. The cava axis was catheterized, and the stenosis area was sequentially dilated with balloons of up to 22 mm. Color Doppler echocardiography confirmed the absence of flow acceleration, and a hemodynamic gradient of 1 mmHg between the IVC and the RA. A 4 mm occlusion device was implanted to close the ASD without residual shunting after its release (figure 2, arrows), resulting in the restoration of normal oxygen saturation. Figure 2. The partial deviation...