• Daisuke Yoshida, Tomoyuki Shimokaze, Atsushi Kondo, Katsuaki Toyoshima, and Tomoko Saito.
• Department of Neonatology, Kanagawa Children's Medical Center, 2-138-4 Mutsukawa, Minami-ku, 232-8555, Yokohama, Japan. ysd620@belle.shiga-med.ac.jp.
• J Clin Monit Comput. 2022 Dec 1; 36 (6): 185918671859-1867.

BackgroundIn pre-term infants, the postnatal changes in the regional oxygen saturation (rSO2) of the brain and kidney are unclear.MethodsWe performed a prospective observational study. We measured the cerebral/renal rSO2 ratio and recorded the associated clinical features of infants born at 23 to 41 weeks of gestation weekly from the early postnatal period to discharge.ResultsThe median cerebral/renal rSO2 ratios (interquartile ranges) between birth and the expected date of birth were 1.13 (1.06-1.26) at 23-24 weeks (n = 7), 1.18 (1.10-1.32) at 25-26 weeks (n = 11), 1.24 (1.11-1.37) at 27-28 weeks (n = 9), 1.12 (1.05-1.19) at 29-30 weeks (n = 4), 1.11 (1.03-1.15) at 31-32 weeks (n = 5), 1.02 (0.98-1.06) at 33-34 weeks (n = 9), 0.98 (0.94-1.06) at 35-36 weeks (n = 19), and 0.95 (0.86-0.99) at 37-41 weeks of gestation (n = 22). The median cerebral/renal rSO2 ratio did not significantly change after birth, but with increasing gestational age, the cerebral/renal rSO2 ratio at the expected date of birth decreased (r = - 0.74, p < 0.001). Nephrotoxic drugs did not affect cerebral/renal rSO2 at the expected date of birth, after adjustment for clinical factors.ConclusionsUnlike in most infants born after the late pre-term period, the renal rSO2 remained lower than the cerebral rSO2 on the expected date of birth in infants born very pre-term.© 2022. The Author(s), under exclusive licence to Springer Nature B.V.

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