Table 5

Subgroup analysis of quantitative coronary angiography comparing optimal angioplasty with stent implantation versus direct stenting

Conventional angioplasty (+ stent) (n=47)Direct stenting (n=89)p Value
Data are mean (SD).
Balloon size (mm)3.32 (0.31)3.39 (0.27)0.35
Balloon:artery ratio1.00 (0.09)1.05 (0.09)0.068
Maximal balloon pressure (atm)13.7 (1.2)13.3 (1.6)0.23
Number of stents1.0 (0.0)1.0 (0.0)1
Length of stents (mm)17.8 (3.6)15.9 (1.7)0.012
Reference diameter (mm)
    Before3.30 (0.45)3.22 (0.37)0.46
    After3.28 (0.44)3.17 (0.33)0.29
    At follow up3.19 (0.44)3.16 (0.40)0.77
Minimal luminal diameter (mm)
    Before0.47 (0.23)0.62 (0.35)0.035
    After3.14 (0.61)3.11 (0.54)0.86
    At follow up1.93 (0.98)2.56 (0.86)0.031
Stenosis (%)
    Before85.3 (7.8)80.5 (10.0)0.022
    After5.9 (8.4)4.8 (9.4)0.74
    At follow up39.5 (30.5)21.9 (22.8)0.037
Gain (mm)2.64 (0.64)2.48 (0.64)0.31
Loss (mm)1.22 (0.90)0.62 (0.69)0.018
Net gain (mm)1.53 (0.93)1.99 (0.92)0.15
Diameter stenosis >50% at follow up13 (28.6%)14 (15.7%)0.011