Background
The HERNIAscore is a ventral incisional hernia (VIH) risk assessment tool that utilizes only preoperative variables and predictable intraoperative variables. The aim of this study was to validate and modify, if needed, the HERNIAscore in an external dataset.
Study Design
This was a retrospective observational study of all patients undergoing resection for gastrointestinal malignancy 2011–2015 at a safety-net hospital. Primary outcome was clinical postoperative VIH. Patients were stratified into low, medium, and high risk based on HERNIAscore. A Revised HERNIAscore was formed with the addition of prior abdominal surgery as a categorical variable. Cox regression of incisional hernia with stratification by risk class was performed. Incidence rates of clinical VIH formation within each risk class were also calculated.
Results
247 patents were enrolled. On Cox regression, in addition to the three variables of the HERNIAscore (BMI, incision length, and COPD), prior abdominal surgery was also predictive of VIH. The Revised HERNIAscore demonstrated improved predictive accuracy for clinical VIH. While the original HERNIAscore effectively stratified the risk of developing an incisional radiographic VIH, the Revised HERNIAscore provided a statistically significant stratification for both clinical and radiographic VIHs in this patient cohort.
Conclusion
We have externally validated and improved the HERNIAscore. The Revised HERNIAscore utilizes BMI, incision length, COPD, and prior abdominal surgery to predict risk of post-operative incisional hernia. Future research should assess methods to prevent incisional hernias in moderate-to-high risk patients.