The CSDH Grading Scheme for Middle Meningeal Artery Embolization: Stratified Risk of Surgical Rescue

Area of Science:

• Neurosurgery
• Interventional Radiology
• Medical Imaging

Background:

• Chronic subdural hematomas (CSDHs) often require intervention.
• Middle meningeal artery embolization (MMAE) is an emerging treatment for CSDHs.
• Predicting the need for surgical rescue after MMAE is crucial for patient management.

Purpose of the Study:

• To develop and validate a grading scheme for predicting surgical rescue risk after MMAE in CSDH patients.
• To identify factors at presentation that indicate MMAE failure.

Main Methods:

• A 4-domain grading scheme was developed, assessing coagulation, scan findings, neurological deficits, and patient history.
• The scheme's predictive performance was evaluated using calibration curves and C-index in an institutional cohort.
• Accuracy was compared against regression models in a separate test dataset.

Main Results:

• The CSDH score demonstrated strong predictive accuracy (C-index 0.81) and discrimination.
• Surgical rescue rates increased significantly with higher CSDH scores (Grade 1: 5.4%, Grade 2: 29%, Grade 3: 67%).
• The CSDH score outperformed traditional regression models in a test dataset (AUROC 0.85).

Conclusions:

• The CSDH score effectively stratifies surgical rescue risk after MMAE.
• Comprehensive assessment of imaging, deficits, and hemorrhagic factors can guide MMAE candidacy.
• This tool can optimize patient selection and follow-up strategies for CSDH treatment.