Search for: [Abstract = "2 and 2.5 years old, respectively\) and BPV was recommended due to recurrent stenosis \(after 4 and 8 years postoperatively, respectively\). One patient with coarctation of the aorta and PVS had undergone a Waldhausen operation when 2 weeks old, and was qualified to BPV when 14 months old. Methods\: During BPV, the following parameters were analyzed\: the type of PVS, the degree of stenosis and right ventricular load \(assessment of systolic, end\-diastolic right ventricular pressure, pulmonary systolic pressure, pressure gradient across PVS\), the balloon diameter and its ratio to annulus diameter, the type of balloon catheter, and the need for double balloon technique employment. Immediately after BPV, the analysis included a decrease of gradient across PVS, a decrease of right ventricular end\-diastolic pressure, changes of pulmonary systolic pressure, development\/intensification of subventricular PVS, development of valve insufficiency and development of complications. A successful procedure was defined as one resulting in at least 50% decrease of pressure gradient across PVS. The patients were divided into three groups, depending on their right ventricular systolic pressure \(RVSP\) as compared to systemic pressure and assessed by hemodynamic studies\: Group 1 \(N=58\) – mild to moderate PVS \(RVSP ≤ 75 % of systemic pressure\)\; Group 2 \(N=41\) – high degree PVS \(RVSP = 76\-100 % of s"]

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