Influence of gestational age and delivery mode on neonatal pulse oxygen saturation shortly after birth / 中华围产医学杂志

ABSTRACT

Objective To explore the trend of preductal pulse oxygen saturation (SpO2) during 10 min after birth in newborns born at different gestational age and through different delivery mode.Methods From May 2014 to August 2014,319 neonates,born in Tianjin Central Hospital of Obstetrics and Gynecology and whose Apgar score at 1 min after birth ≥ 8,were included into the study.Term infants were grouped into vaginal delivery group (n=102) and caesarean group (n=117) according to the delivery mode.Infants born through caesarean section were divided into three groups,including 30-33+6 weeks (n=50),34-36+6 weeks (n=50) and 37-41+6 weeks (n=117) group according to the gestational age at birth.Immediately after the umbilical cord clamped,preductal SpO2 was recorded at each minute from one to ten minutes using the pulse oximetry.Oneway analysis of variance and two independent sample t test were applied for statistical analysis.Results At each time point within ten minutes after birth,the preductal SpO2 for preterm infants of 30-33+6 weeks gestation in the caesarean group were (54± 3)％,(59± 3)％,(65 ±4)％,(70±4)％,(75 ±4)％,(80±4)％,(84± 3)％,(89± 3)％,(91 ± 3)％ and (93 ± 2)％,respectively,which were significant lower than those of the 34-36+6 weeks group [(57 ± 5)％,(66 ± 4)％,(72 ± 6)％,(78 ± 6)％,(83 ± 6)％,(87 ± 6)％,(90± 5)％,(92 ± 4)％,(94± 4)％ and (95 ± 4)％,respectively] and of the term infants [(58 ± 3)％,(67 ± 4)％,(73 ± 5)％,(78 ± 6)％,(83 ± 6)％,(87 ± 6)％,(90± 5)％,(92± 5)％,(94± 3)％ and (95± 3)％,respectively] (all P ≤ 0.05).While the corresponding preductal SpO2 for term infants in the vaginal delivery group were (61 ± 6)％,(69± 7)％,(75 ± 6)％,(81 ± 7)％,(86± 6)％,(90 ± 6)％,(93 ± 5)％,(94± 4)％,(95 ± 4)％ and (96 ± 3)％,respectively,which were all higher than those of term infants in the caesarean group (all P ≤ 0.05).Conclusions The preductal SpO2 for preterm infants of 30-33+6 weeks of gestation is lower than that of preterm and term infants of ≥ 34 weeks of gestation at all time points within ten minutes after birth.The preductal SpO2 for term infants born through vaginal delivery is higher and rising faster than that of term infants born through caesarean section at all times.