Benefit in regionalization of care for patients treated with nephrectomy: a Nationwide Inpatient Sample.

PURPOSE: To provide in absolute terms a quantification of regionalization of care from low- to high-volume hospitals in patients treated with nephrectomy for non-metastatic renal cell carcinoma.
METHODS: Relying on the Nationwide Inpatient Sample, 48,172 patients with non-metastatic renal cell carcinoma undergoing nephrectomy were identified. All analyses focused on five specific endpoints: intraoperative complications, postoperative complications, blood transfusions, prolonged hospitalization, and in-hospital mortality. First, multivariable logistic regression models for prediction of the aforementioned endpoints were fitted among high-volume hospitals treated patients. Second, obtained coefficients from such models were applied onto low-volume hospitals treated individuals. Potentially avoidable events were computed through differences between observed and predicted adverse events. The number needed to treat was generated.
RESULTS: Low-volume hospitals treated individuals were between 11 and 28 % more likely to succumb to an adverse outcome (all P < 0.001). Differences between observed and predicted adverse outcome rates were all in favor of high-volume hospitals, except for in-hospital mortality. Potentially avoidable intraoperative complications, postoperative complications, blood transfusions, prolonged hospitalization, and in-hospital mortality rates were 1.4, 5.6, 7.6, 24.0, and 0.7 %, respectively. Thus, for every 71, 18, 13, 4, and 143 nephrectomies that are redirected to high-volume hospitals, 1 intraoperative complication, postoperative complication, blood transfusion, prolonged hospitalization, and in-hospital mortality could be potentially avoided.
CONCLUSIONS: Regionalization from low- to high-volume hospitals for patients undergoing a nephrectomy is associated with important benefits, for both the payer and patient's perspectives.