A novel diagnostic tool, the HDA score stroke system, now helps predict patient outcomes following endovascular treatment (EVT) for large-vessel occlusion (LVO) stroke. Notably, the study introduces a new High-Density Area (HDA) score. This score utilizes established ASPECTS regions. Furthermore, it incorporates the subarachnoid space and ventricles to better evaluate the risk of hemorrhagic transformation (HT) and unfavorable clinical outcomes in patients.
What is the HDA Score for Stroke?
Following endovascular thrombectomy, high-density areas often appear on a patient’s follow-up CT scan. These areas represent either contrast staining or a hemorrhagic transformation. Therefore, accurately differentiating and quantifying this hyperdensity is crucial. This retrospective, multicenter study included 542 patients who had high-density areas visible after receiving endovascular therapy. Researchers specifically assessed the HDA location and cumulative score to determine its predictive value. Consequently, this new scoring system provides a precise method to categorize and risk-stratify patients post-procedure.
HDA Score Stroke Predicts Hemorrhagic Transformation
Multivariable logistic regression analysis revealed significant associations between the location of the HDA and complications. For instance, the presence of HDA in the lentiform nucleus increased the odds of hemorrhagic transformations (OR, 1.6; 95% CI: 1.1-2.5). A much stronger association was found with HDA located in the ventricles (OR, 4.4; 95% CI: 1.2-16.6). These findings emphasize the differential impact of HDA location on a patient’s risk profile. Conversely, the overall HDA score provides a robust, quantitative predictor for unfavorable clinical outcomes. This predictive power allows clinicians to identify high-risk patients more effectively and implement targeted post-procedural management strategies.
Contextualizing High-Density Areas in Post-EVT Stroke
Prior research supports the clinical significance of hyperdense areas on post-thrombectomy CTs. As an example, a systematic review and meta-analysis indicated that a hyperdense area after EVT associates with a high risk of symptomatic intracerebral hemorrhage, poor functional outcome, and mortality. Other studies suggest that higher density on CT may help differentiate hemorrhage from benign contrast staining. Thus, this new HDA scoring system advances previous findings by providing a standardized, topographical method for risk assessment. Its incorporation into clinical practice could streamline follow-up protocols.
Frequently Asked Questions
Q1: What is the primary finding of the study on the new HDA score?
The study found that the location of the high-density area (HDA) in specific brain regions, particularly the lentiform nucleus and ventricles, strongly associated with an increased risk of hemorrhagic transformation after endovascular treatment for stroke. The overall HDA score also predicted poor functional outcomes.
Q2: Which HDA location showed the highest risk for hemorrhagic transformation?
HDA located in the ventricles demonstrated the highest odds ratio (OR, 4.4) for hemorrhagic transformation. This suggests that ventricular involvement is a critical high-risk factor that clinicians must monitor closely.
Q3: Why is a new HDA score necessary after endovascular therapy?
High-density areas on follow-up CT can be benign contrast staining or clinically significant hemorrhage. Therefore, the novel HDA score provides a standardized, objective, and topographical tool that helps clinicians accurately assess and quantify the risk of a true hemorrhagic transformation and unfavorable clinical outcomes.
References
- Cheng X et al. Role of high-density area score in predicting outcomes of large-vessel occlusion stroke after endovascular treatment. Eur Radiol. 2026 Jan 13. doi: 10.1007/s00330-025-12259-9. PMID: 41528474.
- Evaluation of the CT High-density Area after Endovascular Treatment for Acute Ischemic Stroke. J-Stage. 2017.
- Clinical Significance of Hyperdense Area after Endovascular Therapy in Patients with Acute Ischemic Stroke: A Systematic Review and Meta-Analysis. Cerebrovasc Dis. 2021.
- Clinical Significance of Hyperdense Area after Endovascular Therapy in Patients with Acute Ischemic Stroke: A Systematic Review and Meta-Analysis. Karger Publishers. 2021.
- Value of high-density sign on CT images after mechanical thrombectomy for large vessel occlusion in predicting hemorrhage and unfavorable outcome. The Neuroradiology Journal. 2021.