ptca was successful ( greater than or equal to 20 % change in vessel diameter ) in 13 of 17 ( 76 % ) lesions ( the degree of preptca stenosis was 84 % +/- 3 % vs. 40 % +/- 4 % postptca ; p less than or equal to 0.01 ) .
C2936173
ptca
C0005847
vessel