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Mean (SD) maximum peak instantaneous Doppler gradients measured before (Pre) and one day after (Post) balloon dilatation of the pulmonary valve and at intermediate(ITFU) and late (LTFU) term follow up. There is a reduction (p < 0.001) after dilatation that remains unchanged (p > 0.1) at ITFU. At LTFU, however, there was further fall (p < 0.01).
