fig16

Figure 16. Doppler echocardiographic studies in parasternal long-axis view before (A), the day after (B), and 8 months (C) following balloon pulmonary valvuloplasty (BPV), illustrating a marked reduction in the peak Doppler flow velocity and peak instantaneous gradient from 92 mmHg to 17 mmHg immediately following BPV (A, B). The residual gradient was small (20 mmHg) eight months after BPV (C). Reproduced from Ref.^[18].