Acute Subdural Hematoma (aSDH) Identified
CT showing crescent-shaped extra-axial hyperdense collection, crosses suture lines
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NeurosurgeryManagement
Acute Subdural Hematoma - Surgical Decision (BTF Guidelines)
Acute Subdural Hematoma - Surgical Decision (BTF Guidelines): Acute Subdural Hematoma (aSDH) Identified → SDH Thickness >10mm? → SURGICAL EVACUATION → S...
Pathway Overview
15 steps
Algorithm Steps
15 total
01Start 02Decision SDH Thickness >10mm?
Measure maximum hematoma thickness on CT
- Measure at widest point
- Perpendicular to inner table of skull
- Acute blood is hyperdense on CT
03Action SURGICAL EVACUATION
SDH >10mm requires surgery regardless of GCS (BTF Level III)
- Craniotomy preferred for acute SDH
- Large bone flap for adequate exposure
- Consider decompressive craniectomy if brain swelling
04Action Surgical Approach
Craniotomy vs Craniectomy decision
- Craniotomy: standard approach, bone flap replaced
- Craniectomy: if brain swelling expected
- Large bone flap for adequate exposure
- Evacuate clot, control bleeding, inspect cortex
05Warning ⚠️ TIME-CRITICAL
Early surgery (<4h) associated with better outcomes
- GCS ≤8 with SDH: operate as soon as possible
- Delay increases mortality
- Do not wait for additional imaging if criteria met
06Decision Midline Shift >5mm?
Measure septum pellucidum displacement from midline
- Measure at level of foramen of Monro
- >5mm indicates significant mass effect
- Risk of herniation increases with MLS
07Action SURGICAL EVACUATION
Significant midline shift requires surgery (BTF Level III)
- Path rejoins step 04Shared downstream outcome
08Decision Meeting Non-Operative Criteria?
All must be met for conservative management
- SDH ≤10mm thickness
- Midline shift ≤5mm
- Stable neurological exam
- No pupillary abnormalities
09Action ICP Monitoring if GCS ≤8
Place ICP monitor for comatose patients with small SDH
- EVD preferred if hydrocephalus
- Parenchymal monitor alternative
- Target ICP <22 mmHg
10Decision ICP >20 mmHg?
Persistent ICP elevation despite medical management
11Action SURGICAL EVACUATION
Elevated ICP requires surgery (BTF Level III)
12Decision GCS Decline ≥2 Points?
Clinical deterioration from initial presentation
- Compare to baseline GCS
- Any decline warrants reassessment
- New pupillary changes critical
13Action SURGICAL EVACUATION
Neurological decline requires surgery (BTF Level III)
14Outcome Continue Monitoring → Reassess
Stable patients continue conservative management with serial imaging
15Action Conservative Management
Non-operative care for small, stable SDH
- ICU admission
- Neurological checks q1h
- Repeat CT at 6-8 hours
- Reverse anticoagulation if applicable
- Seizure prophylaxis per guidelines
- Path rejoins step 14Shared downstream outcome
Guideline Source
Brain Trauma Foundation Guidelines for Surgical Management of Traumatic Brain Injury (4th Edition)
Clinical Safety Information
Clinical Decision Support — Not a Substitute for Clinical Judgment
Individual patient factors may require deviation from these recommendations.
Known Limitations
- Applies to ACUTE SDH only - chronic SDH has different criteria
- Does not address pediatric-specific thresholds
- Anticoagulation reversal protocols are institution-specific
- ICP monitoring availability varies by center
- Does not replace neurosurgical consultation
Contraindicated Populations
pediatric
Applicable Regions
USEUGlobal
EU: Compatible with European guidelines
US: Follows BTF Guidelines - standard of care
Version 1Next review: 2028-01-01
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Related Resources
Frequently Asked Questions
What is the Acute Subdural Hematoma - Surgical Decision (BTF Guidelines)?
The Acute Subdural Hematoma - Surgical Decision (BTF Guidelines) is a management clinical algorithm for Neurosurgery. It provides a structured decision tree to guide clinical decision-making, based on Brain Trauma Foundation Guidelines for Surgical Management of Traumatic Brain Injury (4th Edition).
What guideline is the Acute Subdural Hematoma - Surgical Decision (BTF Guidelines) based on?
This algorithm is based on Brain Trauma Foundation Guidelines for Surgical Management of Traumatic Brain Injury (4th Edition) (DOI: 10.1227/NEU.0000000000001432).
What are the limitations of the Acute Subdural Hematoma - Surgical Decision (BTF Guidelines)?
Known limitations include: Applies to ACUTE SDH only - chronic SDH has different criteria; Does not address pediatric-specific thresholds; Anticoagulation reversal protocols are institution-specific; ICP monitoring availability varies by center; Does not replace neurosurgical consultation. Individual patient factors may require deviation from these recommendations.
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