Table 2.
Results of study outcome measures.
| Pre-MDST (n = 272) | Post-MDST (n = 181) | Unadjusted OR (95% CI) | Adjusted ORb (95% CI) | |
|---|---|---|---|---|
| Primary outcome (IVC filter retrieval or retrieval plan), n (%) | 216 (79.4) | 174 (96.1) | 6.44 (3.06–15.84) | 10.59 (3.96–33.43) |
| IVC filter retrieval, n (%) | 143 (52.6) | 133 (73.5) | 2.50 (1.67–3.78) | 4.05 (2.22–7.59) |
| Documented IVC filter plan | 73 (26.8) | 41 (22.7) | – | – |
| Lost to follow-up, n (%) | 56 (20.6) | 7 (3.9) | 0.11 (0.04–0.25) | 0.06 (0.02–0.18) |
| Median time to IVC filter retrieval, days | 187 | 150 | 1.78a (1.39–2.29) | – |
| IVC filter complications, n (%) | 13 (4.8) | 8 (4.4) | 0.92 (0.36–2.23) | 3.71 (1.00–15.74) |
| IVC penetration from filter perforation | 4 | 0 | ||
| Filter tilt with filter adherent to IVC wall | 4 | 8 | ||
| Filter tilt (no embedding) | 1 | 0 | ||
| Filter fracture | 1 | 0 | ||
| Filter migration | 1 | 0 | ||
| Filter embolization | 0 | 0 | ||
| Access site complications | 2 | 0 | ||
| Acute VTE >30 days post filter insertion, n (%) | 14 (5.2) | 8 (4.4) | 0.79 (0.31–1.86) | 1.02 (0.34–3.00) |
| Proximal DVT (excluding IVC thrombosis) | 8 | 3 | ||
| Pulmonary embolism | 0 | 0 | ||
| IVC thrombosis | 4 | 5 | ||
| IVC occlusion | 2 | 0 | ||
| All-cause mortality, n (%) | 34 (12.5) | 27 (14.9) | 1.22 (0.71-2.11) | 1.09 (0.45-2.59) |
IVC, inferior vena cava; MDST, multidisciplinary surveillance team; OR, odds ratio; VTE, venous thromboembolism
a
Time-to-event analysis was performed using the Kaplan–Meier method and comparison between the groups was assessed with a Mantel–Haenszel test. We report hazard ratio with corresponding 95% CI.
b
Adjusted odds ratio adjusted by the variables of age, sex, weight, and malignancy status