BMI: does it predict the need for component separation?

Area of Science:

• Abdominal Surgery
• Radiology
• Hernia Repair

Background:

• Repairing large incisional hernias presents challenges in patient optimization and technique selection.
• Body Mass Index (BMI) is often considered for predicting intra-abdominal pressures and the need for component separation (CS), but lacks supporting data.

Purpose of the Study:

• To assess if the anterior-posterior (AP) to transverse (TRSV) abdominal diameter ratio from pre-operative CT scans indicates increased intra-abdominal fat.
• To determine if this ratio correlates with the need for component separation (CS) for successful tension-free closure of large incisional hernias.

Main Methods:

• Ninety patients undergoing open incisional hernia repair were analyzed.
• Pre-operative CT scans were used to measure hernia defect width, AP abdominal diameter, and TRSV abdominal diameter.
• Logistic regression analysis identified predictors for surgical group categorization (primary closure vs. CS).

Main Results:

• The AP:TRSV diameter ratio was significantly higher in patients requiring CS (0.49 ± 0.10) compared to primary closure (0.41 ± 0.08) (p < 0.001).
• Multivariate analysis showed the AP:TRSV ratio, not BMI, predicted the need for CS (p = 0.001).
• Average hernia defect width was larger in the CS group (9.8 cm) than the primary closure group (7.7 cm) (p = 0.015).

Conclusions:

• The AP:TRSV abdominal diameter ratio is a valuable imaging biomarker for assessing intra-abdominal fat distribution.
• This ratio correlates with the need for component separation in incisional hernia repair, offering a more reliable predictor than BMI.