Search for: [Abstract = "diameter of pulmonary valve annulus in Group 1 was 15.0 mm vs. 15.7 mm, in Group 2 – 13.1 mm vs. 13.9 mm, in Group 3 – 11.8 mm vs. 13.9 mm. No statistical differences were noted between the results of both examinations \(Group 1\-3\: P = 0.08, P = 0.09 and P = 0.1, respectively\). \- the respective mean values of systolic pressure gradient were as follows\: Group 1 – 56.8 mmHg vs. 49.3 mmHg, Group 2 – 73.5 mmHg vs. 75.6 mmHg and Group 3 – 99.1 mmHg vs. 115.6 mmHg. Significant differences were observed between the results obtained using the two methods in Group 1 children, where echocardiography significantly overestimated the gradient, and in Group 3, where the said examination significantly underestimated its value \(P<0.001\). In Group 2 children, however, the two results did not differ significantly \(P = 0.09\). As it follows from the comparison of both methods, echocardiography underestimated the size of pulmonary valve annulus, but the results of the examination did not significantly differ from the results obtained in angiography. On the other hand, in Doppler assessment of the gradient in milder forms of PVS, the result was overestimated, while in more advanced stages, it was underestimated as compared to hemodynamic evaluation. The ratio of the balloon catheter diameters and PVS annuli were extremely similar in the groups, equaling 1.3±0.1, 1.29±0.1 and 1.28±0.1, respectiv"]

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