Impact of Sheath Type on Vascular and Bleeding Complications After Transcatheter Aortic Valve Replacement: A Post Hoc Analysis From the MARVEL Registry Study
Bibliographic record
Abstract
BACKGROUND: Vascular and bleeding complications remain a concern after transfemoral transcatheter aortic valve replacement (TAVR). The impact of the sheath type on these complications remains unclear. METHODS: The prospective MARVEL registry study analyzed enrolled 500 patients undergoing large-bore transfemoral procedures and arteriotomy closure with the MANTA vascular closure device from 10 hospitals in Europe and Canada. We stratified these patients according to type of sheath used (expandable or conventional). A propensity-matched analysis was performed using VARC-2 major or minor vascular and bleeding complications as the primary endpoint. The secondary endpoint was time to hemostasis. RESULTS: We identified 196 propensity-matched pairs. Major vascular complications occurred in 3.6% in the expandable sheath group and 4.1% in the conventional sheath group (p = 1.0). Minor vascular complications occurred in 5.6% in the expandable sheath group and 4.6% in the conventional sheath group (p = 0.819). There were no significant differences in bleeding complications between groups. Time to hemostasis after MANTA closure was significantly shorter in the expandable sheath group (30 vs. 60 s, p < 0.001). CONCLUSIONS: A propensity-matched analysis demonstrated no significant differences in vascular complication rates with MANTA arteriotomy closure after removal of large bore expandable or conventional sheaths. Time to hemostasis was significantly shorter in the expandable sheath group.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.008 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".