F2 and acute kidney injury: The area under the receiver operating characteristic curve for the prediction of myocardial injury after a traumatic hemorrhagic shock was 0.67 (95% CI, 0.68–0.79) for a heart rate of >100 beats/min, 0.67 (95% CI, 0.61–0.73) for hemoglobin level of <70 g/L, 0.66 (95% CI, 0.60–0.73) for prothrombin time of >15 s, 0.70 (95% CI, 0.64–0.76) for acute kidney injury, and 0.78 (95% CI, 0.73–0.83) for APACHE II scores.