Cerebral Contusion Mechanism and Management

Biomechanical Mechanisms

• Cerebral contusions occur through two primary biomechanical mechanisms: direct impact causing coup injuries at the site of trauma, and acceleration-deceleration forces causing contrecoup injuries at sites distant from impact, most commonly in the frontal and temporal lobes when the moving brain strikes the irregular bony interior of the skull 1

Secondary Injury Progression

• Following the biomechanical injury, indiscriminate neurotransmitter release and unchecked ionic fluxes occur, leading to neuronal depolarization, calcium accumulation, and impaired mitochondrial oxidative metabolism 2

Clinical Correlation

• The American College of Emergency Physicians suggests that high-risk impact scenarios include motor vehicle crashes, particularly with ejection from vehicle, pedestrian struck by vehicle, and falls from height greater than 3 feet or 5 stairs 3
• The American College of Cardiology is not relevant here, however, the guideline society Praxis Medical Insights recommends that contusions represent structural brain damage visible on neuroimaging, whereas concussion represents functional disturbance with normal structural neuroimaging 1