Table 3

IVUS Findings

VariableAnte Group (n = 23)Retro Group (n = 25)p Value
“Baseline” IVUS measurements
 Maximum arc of calcium, °115 ± 72137 ± 990.78
 Subintimal wiring
  Prevalence of subintimal wiring2 (9%)10 (40%)0.02
  Length of subintimal wiring, mm1.1 ± 0.328.9 ± 16.80.04
 Proximal reference-segment EEM CSA, mm216.1 ± 3.818.5 ± 4.90.21
 Proximal reference-segment lumen CSA, mm28.1 ± 2.39.4 ± 2.80.35
 Distal reference-segment EEM CSA, mm211.4 ± 4.96.9 ± 2.6<0.005
 Distal reference-segment lumen CSA, mm25.9 ± 2.34.2 ± 1.40.04
Post-stenting IVUS measurements
 Minimum stent CSA, mm25.8 ± 2.35.0 ± 1.30.54
 Stent expansion0.84 ± 0.250.79 ± 0.210.68
 Stent symmetry index0.85 ± 0.080.89 ± 0.060.06

Values are mean ± SD or n (%).

CSA = cross-sectional area; EEM = external elastic membrane; IVUS = intravascular ultrasound; other abbreviations as in Table 1.

  • Immediately after wiring or after pre-dilation with a 1.5- to 2.0-mm balloon.