Prediction of Fluid Responsiveness in Children Undergoing Major Surgery

When there are clinical signs of hypovolemia, such as hypotension, decreased urine output and central venous pressure less than 5 mmHg, POP waveforms are obtained from each index finger, which pulse oximeter sensor is applied by increasing contact force (from 0 to 1.4N, being increased by 0.2-0.3N). Then intravenous crystalloid 10 mL/kg is infused for 15 min.