Observation of the blood pressure changes in preterm infants with gestational age of 28 to <37 weeks within 7 days after birth: a single center retrospective study

Within 7 days after birth, SBP and MAP of preterm infants with a gestational age of 28 to <37 weeks show a spontaneous upward trend with the increase of postnatal age, among which the increase of SBP is more obvious and tends to stabilize about 3 days after birth. The postnatal blood pressure reference ranges vary among preterm infants of different gestational ages, which provides a reference basis for the early postnatal blood pressure assessment and clinical management of preterm infants with different gestational ages.