Influence of blood loss on cerebral oxygen saturation in paediatric patients undergoing surgery for scoliosis correction: A retrospective observational study

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Aim Surgery for congenital scoliosis correction in children is often associated with considerable blood loss. Decrease in regional oxygen saturation (rScO 2 ) can reflect insufficient cerebral perfusion and predict neurological complications. This retrospective observational study explored the relationship between blood loss during this surgery and a decrease in rScO 2 in children. Methods The following clinical data of children aged 3–14 years who underwent elective posterior scoliosis correction between March 2019 and July 2021 were collected: age, sex, height, weight, baseline rScO 2 , basal mean invasive arterial pressure (MAP), preoperative Cobb angle, number of surgical segments, preoperative and postoperative haemoglobin level, percentage of lowest rScO 2 below the baseline value that lasted 3 min or more during the operation (decline of rScO 2 from baseline, D‐rScO 2 %), intraoperative average invasive MAP, end‐tidal carbon dioxide pressure, fluid infusion rate of crystalloids and colloids, operation time, and percentage of total blood loss/patient's blood volume (TBL/PBV). Results A total of 105 children were included in the study. Massive haemorrhage (TBL/PBV ≥50%) was reported in 53.3% of patients, who had significantly higher D‐rScO 2 (%) ( t = −5.264, P < 0.001) than those who had non‐massive haemorrhage (TBL/PBV <50%). Multiple regression analysis revealed that TBL/PBV ( β = 0.04, 95% CI: 0.018–0.062, P < 0.05) was significantly associated with D‐rScO 2 %. Conclusions Intraoperative massive blood loss in children significantly increased D‐rScO 2 %. Monitoring should be improved, and timely blood supplementation should be performed to ensure maintenance of the blood and oxygen supply to vital organs, improve the safety of anaesthesia, and avoid neurological complications.