Figure 2

(A) Pressure recording during catheter withdrawal through the conduit before balloon angioplasty, showing a gradient of 45 mm Hg. Scale: 0–100 mm Hg. (B) Pressure recording post-dilatation, showing a gradient of < 10 mm Hg. The pulmonary arterial pressure in early diastole is 0, suggesting significant pulmonary valve incompetence. Scale: 0–100 mm Hg. PA, pulmonary artery; RV, right ventricle.