Table IV.
Univariate analysis of graft/target/vessel-specific factors associated with odd of SVG occlusion versus patency
| Variable | Odds of occlusion | P value |
|---|---|---|
| Number of implanted SVGs per patient* | 1.04 | 0.76 |
| SVG type† | ||
| Single distal anastomosis | Reference | |
| Multiple distal anastomosis (skip-graft† | 0.40 | 0.03 |
| Y-graft† | 3–05 | 1.11 |
| Target vessel | ||
| Left anterior descending artery | Reference | |
| Left anterior descending diagonal | 1.25 | 0.77 |
| Ramus intermedius | 1.25 | 0.78 |
| Circumflex obtuse marginal artery | 0.46 | 0.30 |
| Right coronary artery | 0.55 | 0.45 |
| Posterior descending artery (right or left) | 0.58 | 0.49 |
| Posterolateral branch (right or left) | 0.55 | 0.58 |
| Percent proximal native artery stenosis* | 1.005 | 0.51 |
| Target vessel diameter ≤1.5 mm† | 2.78 | 0.001 |
| SVG diameter, mm* | 0.99 | 0.95 |
| SVG-target vessel diameter ratio*† | 1.66 | 0.02 |
| Endoscopic SVG harvest | 0.75 | 0.32 |
| SVG quality at implantation† | ||
| Normal | Reference | |
| Thin or aneurysmal | 1.87 | 0.17 |
| Thickened or sclerotic | 0.62 | 0.34 |
| Aortic anastomosis clamp technique | ||
| Side-biting clamp† | Reference | |
| Cross-clamp | 0.57 | 0.06 |
| Distal anastomosis type† | ||
| End-to-side | Reference | |
| Side-to-side | 0.43 | 0.10 |
| Target vessel quality at distal anastomosis† | ||
| No intimai disease | Reference | |
| Mild intimai disease | 0.88 | 0.73 |
| Moderate intimai disease | 0.63 | 0.26 |
| Severe intimai disease | 1.40 | 0.41 |
| Calcification at distal anastomosis† | 2.15 | 0.03 |
| Target vessel endarterectomy† | 3.62 | 0.15 |
Abbreviations: SVG, saphenous vein graft.
*
Odds of occlusion for every variable unit increase
†
included in the multivariate analysis.