Cross sectional area (CSA) measurements with intravascular ultrasound
| Variables | Group I (n = 15) | Group II (n = 20) | p value |
|---|---|---|---|
| Minimum lumen site | |||
| Lumen CSA (mm2) | 2.4 (1.0) | 2.3 (1.5) | NS |
| Vessel CSA (mm2) | 13.3 (3.0) | 17.5 (5.6) | < 0.01 |
| Plaque CSA (mm2) | 10.9 (2.8) | 15.2 (4.9) | < 0.005 |
| CSA plaque burden (%) | 82 (7) | 87 (7) | < 0.05 |
| Reference site | |||
| Lumen CSA (mm2) | 7.2 (3.6) | 7.4 (4.1) | NS |
| Vessel CSA (mm2) | 14.4 (3.6) | 14.0 (6.0) | NS |
| Plaque CSA (mm2) | 7.3 (2.5) | 6.5 (3.0) | NS |
| CSA plaque burden (%) | 52 (15) | 49 (16) | NS |
Values are mean (SD).
Groups I and II, lesions with and without inadequate compensatory vascular enlargement, respectively.
Reference images were acquired no more than 3 mm distal to the 20 mm long lesion segments.