Figure 1From: Intraoperative renal near-infrared spectroscopy indicates developing acute kidney injury in infants undergoing cardiac surgery with cardiopulmonary bypass: a case–control study Example of calculating the area under the curve for regional oxygenation below 65%. Yellow region represents the second percent with the renal near-infrared spectroscopy (NIRS) below the 65% threshold (red bar). p.o., Postoperatively; rSO2, Regional oxygenation.Back to article page