Does Size and Site Matter in Therapeutic Decompressive Craniectomy? A Laboratory-Based Experimental Study

Area of Science:

• Neurosurgery
• Critical Care Medicine
• Neurology

Background:

• Therapeutic decompressive craniectomy (TDC) is used to manage increased intracranial pressure (ICP).
• Standardization of TDC size and location remains a challenge.
• This study investigates the impact of TDC size and site on ICP control.

Purpose of the Study:

• To evaluate the influence of decompressive craniectomy size and location on controlling elevated intracranial pressure.
• To determine the optimal TDC dimensions for managing refractory intracranial hypertension.
• To correlate TDC size with the capacity for accommodating postoperative brain swelling.

Main Methods:

• Utilized a replica skull model with induced refractory increased ICP.
• Sequentially altered TDC size to identify the optimal dimensions for ICP normalization.
• Measured the volume of air needed to restore elevated ICP levels.

Main Results:

• An 8.3 cm diameter TDC was most effective in lowering ICP (P < 0.001).
• A 7.5 cm TDC adequately controlled ICP between 25-30 mm Hg (P < 0.01).
• TDC size strongly correlated with the volume available for brain swelling (r = 0.95928).
• Anterior TDC placement was more effective for intermediate sizes (4.5-5.5 cm).

Conclusions:

• TDC size is critical for reducing ICP and should be tailored to ICP levels and expected swelling.
• Anterior placement of smaller TDCs can enhance ICP control.
• TDC location is less critical for severe ICP (>30 mm Hg) when using larger TDCs (≥8.3 cm).