Abstract 65: Malignant Emboli On Trans Cranial Doppler During Carotid Stenting Predict Post Procedural DWI Lesions And Are Most Common During Stent And Distal Protection Device Deployment
Bibliographic record
Abstract
BACKGOUND: We evaluated the safety of the steps during carotid stenting. METHODS: This was a prospective single-arm study. Cases were monitored by TCD during the stenting procedure. The time of each of 11 steps was recorded and noted during TCD interpretation. Post stenting MRI was done in all patients. Emboli on TCD were classified based on the relative energy index of microemboli (REIM) method into microemboli (REIM ≤ 1) or malignant (REIM >1). Medians were compared using Mann-Whitney test. A negative binomial model was used to investigate the predictive value of TCD findings on new DWI hits. RESULTS: We enrolled 30 subjects. The median age was 70.5 years and 23.3% were asymptomatic. The median count of embolic signals was 212.5 (108 microemboli, 80 malignant). Stent deployment had the highest median count 58 (31 microemboli, 20 malignant) followed by protection device deployment 30 (21 microemboli, 10 malignant, (p value 0.0006)) “Figure”. On post stenting MRI, 80% had new DWI hits. The median DWI count was 4 (range 0-33). The median volume of DWI hits was 0.4 ml (range 0 - 6.1 ml). 63% of patients had a total volume under 1 ml. Only 2 patients (6.7%) had new deficits post stenting. The median DWI volume in those patients was 3.0 ml compared to 0.6 ml in asymptomatic cases (p 0.037). Median emboli count in those with vs. without new deficits was not different (p 0.87) Total TCD emboli count did not predict DWI hits, adjusting for age and symptoms’ status (p 0.25). Malignant emboli predicted new DWI hits (p 0.044). For every malignant embolus, the expected count of DWI hits increases by 1% (CI95 0-2%). There was no relation between total or malignant emboli with the DWI volume. CONCLUSIONS: In this prospective study, we observed a high incidence of emboli on TCD during stenting, especially when stent and protection device were deployed. Most patients developed new DWI hits but only 6.7% had new deficits. The combined DWI volume was less than 1.0 ml in most cases. Only malignant emboli predicted new DWI hits.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| 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) | 0.003 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".