Fig. 5

A ROC curve analysis considering pre-surgical SBP according to HI. The AUC was 0.719 (95% CI 0.524–0.914), p = 0.030. A value higher than 133 mmHg shows a sensitivity of 66.7% and a specificity of 75%. B ROC curve analysis considering SBP during surgery according to HI. The AUC was 0.921 (95% CI 0.801–1.00), p < 0.0001. A value higher than 127 mmHg shows a sensitivity of 83.3% and a specificity of 85.7%. C ROC curve analysis considering MBP during surgery according to HI. The AUC was 0.937 (95% CI 0.851–1.00), p < 0.0001. A value higher than 90 mmHg shows a sensitivity of 83.3% and a specificity of 85.7%. Notes: SBP systolic blood pressure, MBP blood pressure, HI hemodynamic instability