The Correlation Between Tissue Oxygenations Using NIRS and Clinical Outcomes in Very Preterm Infants.

NIRS monitoring begins within 24 hours after birth. Oxygen saturation in the brain and intestines is monitored for 15 minutes at the same time every day. The probe should be fixed with medical tape and closed to the skin to avoid light leakage. At the same time, shading measures should be taken on the probe and skin surface to reduce the impact of environmental factors. Continuous monitoring for 7 days. If the infants start feeding during the period, monitor 15 minutes from 5 minutes before feeding, including before, during, and after feeding, and the relatively stable data at each time point was taken as the intestinal tissue oxygen saturation at that time, and the oxygen saturation variation and tissue oxygen extraction ratio are calculated. Clinical data were recorded at the time of each measurement and included feeding status and the use of mechanical ventilation, oxygen therapy, and medications and so on.