Abstract
Purpose
Post-operative pulmonary failure is a major complication of nephrectomy that may lead to severe morbidity and mortality. Hence, we aimed to derive a nephrectomy-specific post-operative respiratory failure index.
Methods
Our cohort was derived from The American College of Surgeons—National Surgical Quality Improvement Program database between 2005 and 2019. The outcome of interest was post-operative respiratory failure (PRF) defined as any incidence of unplanned intubation post-operatively or requiring mechanical ventilation post-operatively for a period > 48 h. A multivariable logistic regression model was constructed, and model calibration and performance were assessed using a ROC analysis and the Hosmer–Lemeshow test. Finally, we derived the nephrectomy-specific respiratory failure (NSRF) index and compared it to Gupta’s index.
Results
Seventy-nine thousand five hundred and twenty-three patients underwent nephrectomy between the years 2005 and 2019 of which nine hundred and sixty-two patients developed PRF. The final NSRF model encompassed ten variables: age, smoking status, American society of anesthesiology class, abnormal creatinine (≥ 1.5 mg/dL), anemia (< 36%), functional health status, chronic obstructive pulmonary disease, surgical approach, emergency case, and obesity (≥ 40 kg/m2). The NSRF ROC analysis provided C-statistic = 0.78, calibration R2 = 0.99, and proper goodness of fit. In comparison, the C-statistics of Gupta’s index was found to be 0.71 (p value < 0.001).
Conclusion
The NSRF is a procedure tailored index for predicting post-operative respiratory failure. It is a valuable tool in the pre-operative evaluation setting that can help identify high-risk patients who will require additional respiratory evaluation and preparation for their surgery.
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Data availability
The (ACS-NSQIP) data are subject to a data use agreement. To access the dataset, a request to the ACS-NSQIP participant-use form should be placed at the following link (https://www.facs.org/quality-programs/acs-nsqip/participant-use). The American University of Beirut Medical Center is enrolled in ACS-NSQIP as a participating center. As such, the data were made available by the ACS-NSQIP center and the AUBMC Department of Surgery after signing the data use agreement.
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CHA: conceptualized the study, retrieved, and analyzed the data, and wrote/edited the manuscript. JMA: conceptualized the study, wrote/edited the manuscript. AEA wrote/edited the manuscript. ADE, AC/L, ElK: wrote/edited the manuscript. HT: helped in retrieval and analyzed the data. A.EHVC: project conception/design, manuscript writing/editing. All authors read and approved the final manuscript.
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Ayoub, C.H., El-Asmar, J.M., El-Achkar, A. et al. A novel nephrectomy-specific respiratory failure index using the ACS-NSQIP dataset. Int Urol Nephrol 55, 813–822 (2023). https://doi.org/10.1007/s11255-023-03507-2
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DOI: https://doi.org/10.1007/s11255-023-03507-2