Abstract
Aims Percutaneous nephrolithotomy is known to have a significant risk of sepsis and traditionally the systemic inflammatory response score has been used to identify post-operative patients requiring higher levels of care. Recently, the quick Sepsis Related Organ Failure Assessment score has been developed as a rapid and easy tool to assess patients likely to deteriorate from sepsis. We aim to evaluate the quick Sepsis Related Organ Failure Assessment system against the established systemic inflammatory response score criteria in identifying patients at risk of intensive care unit admission following percutaneous nephrolithotomy. Patients and Methods A retrospective review of 157 patients undergoing percutaneous nephrolithotomy between May 2015 and November 2018 at our institution was performed. Patient demographics of age, sex and American Society of Anesthesiologists' score were collected. Quick Sepsis Related Organ Failure Assessment and systemic inflammatory response scores were calculated at 24 hours and 7 days post-operatively. Primary outcome was admission to an intensive care unit. Specificity, sensitivity, positive and negative predictive values were calculated for the systemic inflammatory response and quick Sepsis Related Organ Failure Assessment scores. Results Of 157 patients undergoing percutaneous nephrolithotomy, eight (5.1%) and 52 (33.1%) scored positively for quick Sepsis Related Organ Failure Assessment and systemic inflammatory response score criteria within 24 hours. Quick Sepsis Related Organ Failure Assessment scoring had a higher specificity (98.7%: 95% confidence interval 98.6-98.7%) and positive predictive value (75.0: 95% confidence interval 74.0-75.0%) than systemic inflammatory response score criteria (69.5%: 95% confidence interval 69.3-69.7%), (11.5%; 95% confidence interval 1.2-11.8%) in predicting intensive care unit admission following percutaneous nephrolithotomy. Quick Sepsis Related Organ Failure Assessment correlated strongly with intensive care unit admission and overall length of stay, whereas systemic inflammatory response score correlated weakly with both parameters. Conclusion Quick Sepsis Related Organ Failure Assessment demonstrated a statistically significant improvement in predicting intensive care unit admission and overall length of stay versus systemic inflammatory response score criteria following percutaneous nephrolithotomy. Further multi-centre studies are required to validate these findings, which are the first to be published in a urology-specific patient population.