Renal Doppler Resistive Index as a Marker of Oxygen Supply and Demand Mismatch in Postoperative Cardiac Surgery Patients

Figure 1

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.