Reoperative Aortic Root Replacement in Patients with Previous Aortic Root or Aortic Valve Procedures.

On multivariable Cox-proportional hazard models, emergency surgery (hazard ratio [HR], 2.80; 95% confidence interval [CI], 1.12 to 7.00; p=0.027) was the only significant and independent predictor of the major adverse outcomes (death and valve-related complications) while the baseline hemoglobin level was a marginally significant factor associated with the adverse outcomes (HR, 0.80; 95% CI, 0.63 to 1.03 by 1 g/dL increment; p=0.079).

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