Risk Factors for Epidural Hematoma Expansion and the Need for Surgery.

Area of Science:

• Neurosurgery
• Radiology
• Trauma Care

Background:

• Head CT use for trauma has increased, with a focus on intracranial hemorrhages.
• Epidural hematomas (EDHs) are uncommon but can expand, requiring surgical evaluation.
• Identifying risk factors for EDH size, enlargement, and surgery is crucial for treatment strategies.

Purpose of the Study:

• To identify risk factors for initial epidural hematoma (EDH) size.
• To determine predictors of EDH enlargement and subsequent surgical intervention.
• To guide imaging and treatment strategies for EDH management.

Main Methods:

• Retrospective review of 32,401 head CT reports from two trauma centers (2018-2024).
• Identification of EDHs via structured radiology report search.
• Analysis of clinical, demographic, and imaging characteristics using statistical methods including logistic regression.

Main Results:

• Larger initial EDH size associated with arterial bleeding, mixed attenuation, and spot sign.
• Concurrent subarachnoid hemorrhage (SAH) was the sole significant predictor of EDH enlargement (OR=2.60, P=.05).
• EDH enlargement occurred in 28.1% of cases, with repeat CTs performed at a mean of 6.6 hours.

Conclusions:

• Concurrent SAH is the strongest predictor of EDH enlargement, warranting close monitoring and repeat CTs within 6-13 hours.
• Initial large size, midline shift, arterial source, and active bleeding signs predict early surgical intervention.
• Further multicenter studies are needed to refine risk stratification and optimize follow-up imaging protocols.