Table 4

Pulmonary artery stenosis: comparison of data before and after stent implantation and redilation

Pre-stentPost-stentPre-redilatationPost-redilatation
Median values and ranges are given for each measurement. Data are compared with those in the preceding column. The number of measurements included in the comparison and the statistical significance of changes are indicated.
PA, pulmonary artery; RV/Ao, ratio of right ventricular systolic pressure to systemic systolic pressure.
Lumen diameter (mm)4.9 (1.9–8.0)8.1 (2.6–13.2)6.9 (3.8–13.5)8.8 (4.8–14.1)
n=19; p<0.001n=19; p=0.28n=19; p<0.001
Gradient (mm Hg)30 (7–68)10 (0–24)24 (2–62)12 (0–29)
n=13; p=0.002n=13; p=0.009n=19; p<0.001
Diameter/PA0.5 (0.21–0.7)0.92 (0.51–1.7)0.66 (0.44–1.5)0.86 (0.48–1.88)
n=15; p<0.001n=12; p=0.005n=16; p=0.001
RV/Ao0.7 (0.33–1.05)0.49 (0.32–0.79)0.53 (0.4–0.97)0.45 (0.3–0.68)
n=7; p=0.28n=7; p=0.17n=9; p=0.017