balloon dilatation of stenotic pulmonic or aortic valves ( replacing valvotomy ) , balloon dilatation of coarctation of the aorta ( replacing operative correction ) and , rarely , closure of vessels with the help of catheters ( replacing ligation ) are being increasingly tried in this age group as well , though they do not yet belong to the routine methods .
C0005847
vessels
C0023690
ligation