In addition, the highest myoglobin quartile (vs. the lowest, quartile 1) had an adjusted odds ratio of 18.95 (95% confidence interval [CI], 6.00 to 59.83) for AKI, and the OR (vs. quartile 2) was 7.92 (95% CI, 1.62 to 38.89) for AKI at discharge and death at 90 d. Here, MB is linked to acute kidney injury.