Utilisation of an operative difficulty grading scale for laparoscopic cholecystectomy

Area of Science:

• Surgical Oncology
• Minimally Invasive Surgery
• Clinical Outcomes Research

Background:

• Standardizing operative difficulty assessment in laparoscopic cholecystectomy is crucial for consistent reporting of findings and outcomes.
• The Nassar scale was developed to provide a reliable system for grading surgical difficulty.
• Validation in large datasets is necessary to confirm its applicability and consistency.

Purpose of the Study:

• To validate the Nassar operative difficulty scale for laparoscopic cholecystectomy.
• To test the scale's applicability and consistency across two large, independent prospective datasets.
• To assess the correlation between operative difficulty grading and patient outcomes.

Main Methods:

• Utilized two prospective cholecystectomy databases (CholeS study: 8820 patients; single-surgeon series: 4089 patients).
• Correlated patient/disease variables and 30-day outcomes with the Nassar scale using statistical tests (Kendall's tau, Jonckheere-Terpstra).
• Performed ROC curve analysis to evaluate the scale's predictive accuracy for various outcomes.

Main Results:

• Higher Nassar scale grades consistently correlated with worse patient outcomes in both cohorts.
• Increased difficulty grade (1-5) was associated with longer hospital stay (0-4 days) and higher complication rates (7.6%-24.4%, p < 0.001).
• The scale independently predicted operative duration, conversion to open surgery, 30-day complications, and reintervention (p < 0.001).

Conclusions:

• The Nassar operative difficulty scale standardizes the description of surgical findings across different surgeon experience levels.
• The scale facilitates surgical audit, training assessment, and research by providing a tool for reporting disease severity and technical difficulty.
• It enables reliable comparison of outcomes based on case mix and intra-operative difficulty in future studies.