Abstract WP140: Concurrent Anterior Cerebral Artery Involvement Is Predictive of Mortality In Severe Middle Cerebral Artery Ischemic Stroke
Bibliographic record
Abstract
Background: Severe middle cerebral artery (MCA) stroke is associated with a high rate of morbidity and mortality. We assessed the hypothesis that patient specific variables may be associated with outcomes. We also sought to describe under-recognized outcomes. Methods: A consecutive, multi-institution, retrospective cohort of adult patients (≤70 years) was established from 2009-2011. 127 patients were first identified by NIHSS score ≥ 15 and then screened for initial infarct volume ≥ 60 mL3. Malignant edema was defined as the development of midline brain shift of ≥ 5 mm in the first 5 days. The only exclusion criterion was enrollment in any experimental trial. 6 patients were censored from secondary analysis given that therapeutic treatment was not pursued. A univariate and multivariate logistic regression analysis was performed to model and predict the factors related to outcomes. Significance was predefined at p≤0.05 (two-tailed). Results: 46 patients (29 female, 17 male; mean age 57.3±1.5) met study criteria. The mortality rate was 28% (n=13). Univariate predictors of mortality included infarct volume, intracranial pressure (ICP) crisis, and concurrent anterior cerebral artery (ACA) involvement. In a multivariate analysis, only concurrent ACA involvement was associated with mortality (OR 9.78, 95% CI 1.15, 82.8, p=0.04). Univariate predictors of tracheostomy were decompressive craniectomy (DC) and admission GCS score. In multivariate analysis, only admission GCS score was significant (OR 0.59, 95% CI 0.37, 0.94, p=0.03). Infarct volume, elevated peak serum sodium level, hyperosmolar therapy, and ICP crisis independently predicted the development of malignant edema, whereas only infarct volume remained significant in multivariate analysis (OR 1.02, 95% CI 1.00, 1.04, p=0.05). In the malignant edema subgroup (n=23, 58%), 4 died (17%), 7 underwent DC (30%), 7 underwent tracheostomy (30%), and 15 underwent gastrostomy (65%). Conclusion: Adverse outcomes after severe stroke are common. ACA involvement predicts mortality in severe MCA stroke. Knowledge of outcomes and their predictors is necessary for optimal care and future study.
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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 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 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".