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Figure 4 Locations of radiofrequency ablation attempts in Mustard and Senning patients. Illustrated are lesion locations for supraventricular tachycardias successfully and unsuccessfully ablated. In patients whose tachycardias were successfully ablated, unsuccessful locations are not illustrated. In the Mustard diagram, the solid gray area represents the systemic venous atrium, and the stippled area, the isthmus between the tricuspid valve and inferior vena cava. In the Senning diagram, the systemic venous atrium is opened, approximating the anatomy from Figure 2. The right atrial freewall flap comprising the roof over the systemic venous (intercaval) atrium is also removed, revealing the entire atrial septal remnant. The portion remaining on the pulmonary venous atrial (PVA) side includes the tricuspid valve/inferior vena cava isthmus. See text for details. MV = mitral valve; SVA = systemic venous atrium; TV = tricuspid valve.
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