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Published on: August 25, 2014
Antenatal and postnatal risk factors for neonatal hypertension and infant follow-up
Wael A Seliem1, Michael C Falk, Bruce Shadbolt
1Department of Neonatology, The Canberra Hospital, P.O. Box 11, Woden 2606 ACT, Australia.
Insights
Neonatal hypertension, a rare intensive care complication, is linked to prematurity and specific risk factors. Most infants’ blood pressure normalizes by six months without long-term treatment.
Area of Science:
- Neonatology
- Pediatric Nephrology
- Critical Care Medicine
Background:
- Neonatal hypertension is an infrequent yet significant complication in neonatal intensive care.
- Identifying risk factors and understanding outcomes are crucial for managing affected infants.
Purpose of the Study:
- To determine antenatal and postnatal risk factors for neonatal hypertension.
- To assess aldosterone and renin levels in neonates with hypertension.
- To report on the early infancy outcomes of these infants.
Main Methods:
- Retrospective review of neonates diagnosed with systemic hypertension between January 2001 and December 2005.
- Collection of demographic data, risk factors, laboratory results, and follow-up data at 3-6 months.
- Analysis of 2,572 newborn infants, with 34 (1.3%) diagnosed with hypertension.
Main Results:
- Infants with hypertension had significantly lower gestational age, birth weight, and length.
- Key risk factors included antenatal steroids, maternal hypertension, umbilical arterial catheter use, postnatal acute renal failure, patent ductus arteriosus, indomethacin, and chronic lung disease.
- Elevated aldosterone (60%) and renin (33%) levels were common but mostly normalized by 6 months.
Conclusions:
- Neonatal hypertension is associated with specific antenatal and postnatal factors and prematurity.
- Hormonal imbalances (aldosterone, renin) are often transient.
- Most infants achieve normotension by early infancy, often without requiring ongoing treatment.
Abstract:
Neonatal hypertension is an uncommon but important complication of intensive care management. The aims of this study were to identify in neonates with hypertension: antenatal and postnatal risk factors; aldosterone and renin levels; and report on outcome in early infancy. The study involved a retrospective review of neonates diagnosed with systemic hypertension from January 2001 to December 2005. Demographic data, risk factors, laboratory investigation, and follow-up data at 3-6 months of age were collected. Of the 2,572 newborn infants included, 34 (1.3%) had neonatal hypertension. Gestational age and birth weight and length were significantly lower in infants with hypertension. The median postnatal age at diagnosis of systemic hypertension was 5.0 days. Antenatal steroid administration, maternal hypertension, umbilical arterial catheter, postnatal acute renal failure, patent ductus arteriosus, indomethacin treatment and chronic lung disease were associated with the development of neonatal hypertension [odds ratios (OR) 8.7, 3.8, 10.0, 51.8, 5.9, 5.7 and 7.7, respectively]. Elevated aldosterone and renin levels occurred in 60% and 33% but had normalised in the majority by 6 months of age. The majority of infants do not require treatment for hypertension by 6 months of age.
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