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Do maternal- or pregnancy-associated disease states affect blood pressure in the early neonatal period?

Authors


: Associate Professor Alison Kent, Department of Neonatology, Canberra Hospital, PO Box 11, Woden, ACT 2606, Australia. Email: alison.kent@act.gov.au

Abstract

Background: Placental vascular changes associated with maternal disease states may affect fetal vascular development. There is evidence suggesting that being born prematurely is associated with a higher blood pressure (BP) in later life.

Aim: To determine whether maternal disease state affects BP in the early neonatal period.

Methods: Cohort study of neonates admitted to neonatal intensive care unit with exposure to maternal hypertension and diabetes. Inclusion criteria were neonates greater than 27 weeks gestation not ventilated or requiring inotropes for more than 24 h, materna l hypertension (pregnancy induced or essential) or diabetes of any kind requiring treatment, and spontaneous delivery. Exclusion criteria included chromosomal or congenital anomaly and illicit maternal drug use. Oscillometric BP measurements taken until discharge on days 1, 2, 3, 4, 7, 14, 21 and 28. Placental histopathology was performed.

Results: One hundred and ninety infants enrolled, 104 in the control and 86 in the study group. Sixty-five infants were born between 28–31 weeks and 125 infants between 32–41 weeks gestation. Those born between 28–31 weeks with a history of diabetes had a statistically higher systolic, mean and diastolic BP throughout the first 28 days of life (P = 0.001; P = 0.007; P = 0.02). Those born between 32–41 weeks gestation with placental pathology associated with altered uteroplacental perfusion had a higher systolic BP (P = 0.005).

Conclusions: Maternal- or pregnancy-associated disease states appear to influence BP in the early neonatal period. Diabetes and altered placental perfusion were associated with higher BP readings. Clinical significance of these statistically elevated BPs in the early neonatal period is unknown.

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