Figure 15: Bar graph depicts immediate results of balloon angioplasty and surgery for aortic coarctation; note significant (p<0.005) reduction in peakto- peak gradient across the coarctation both after surgery and balloon angioplasty. This gradient reduction between the groups is not significant (p=0.28). Mean + standard error of mean (SEM) are shown. PRE, before; POST, after intervention.