A suitable formula for estimating the volume gained by decompressive craniectomy in malignant hemispheric infarction

Area of Science:

• Neurosurgery
• Radiology
• Medical Imaging Analysis

Background:

• Decompressive craniectomy (DC) is crucial for improving survival and functional outcomes in patients with malignant hemispheric infarction (MHI).
• The effectiveness of DC is directly related to the decompressive volume (DV) achieved.
• Accurate estimation of DV is essential, but the utility of existing formulas remains unverified.

Purpose of the Study:

• To evaluate the accuracy of different formulas in estimating decompressive volume (DV).
• To identify the most reliable formula for DV estimation in patients undergoing DC for MHI.

Main Methods:

• Analysis of head CT scans from six patients who underwent DC for MHI.
• Comparison of four formulas (1/2ABC, 1/3ABC, π/6ABC, 2/3Sh) against computer-assisted volumetric analysis (gold standard) for DV estimation.
• Statistical analysis using Spearman's correlation coefficient to assess formula accuracy.

Main Results:

• Mean DV values: Gold Standard (100.2 mL), 1/2ABC (102.4 mL), 1/3ABC (68.3 mL), π/6ABC (105.2 mL), 2/3Sh (109.2 mL).
• Spearman's correlation coefficients: 1/2ABC (0.8095, p < 0.05), 1/3ABC (0.8095, p < 0.05), π/6ABC (0.7381, p < 0.05), 2/3Sh (0.4524, p > 0.05).
• The 1/2ABC formula demonstrated the highest correlation with the gold standard, indicating superior accuracy.

Conclusions:

• The 1/2ABC formula provides the most accurate and useful estimation of decompressive volume (DV) in patients with MHI undergoing DC.
• This validated formula can aid clinicians in better assessing the extent of decompression and potentially predicting patient outcomes.