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Correlations of renal Doppler resistive (RDRI) index with SvO2: mixed venous oxygen saturation, O2ER: oxygen extraction ratio [VO2I/DO2I], DO2I: oxygen delivery index [CI × Hb × 1.34 × SaO2 + 0.003 × PaO2], VO2I: oxygen consumption index [CI × Hb × 1.34 × SvO2 + 0.003 × PvO2], cLac: arterial lactate concentration, and age, in 61 patients admitted to the intensive care unit after elective cardiac surgery.
