6 3.5. The risk score was divided into low-risk [0-4 points, n ¼ 5,272 (52%); NHD ¼ 10.1%] moderate-risk [5-9 points, n ¼ 3663 (36.7%) NHD ¼ 36.7%], and high-risk [10 points, n ¼ 1210 (11.9%) NHD ¼ 66.1%).Conclusions: A novel risk score was highly predictive for NHD after bypass for LEI using only preoperative comorbidities. High-risk patients account for 12% of bypasses but nearly a third of all patients with NHD. This risk score can be used to determine high-risk patients for discharge preoperatively allowing providers to anticipate their need in the preoperative setting or upon immediate presentation to the hospital.
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