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Published Online First: 5 May 2005. doi:10.1136/adc.2005.071688
Archives of Disease in Childhood - Fetal and Neonatal Edition 2005;90:F509-F513
Copyright © 2005 BMJ Publishing Group Ltd & Royal College of Paediatrics and Child Health

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ORIGINAL ARTICLE

Antenatal steroids and fluid balance in very low birthweight infants

G Dimitriou, V Kavvadia, M Marcou, A Greenough

Division of Asthma and Lung Biology, Guy’s, King’s and St Thomas’ School of Medicine, King’s College London, UK

Correspondence to:
Correspondence to:
Professor Greenough
Neonatal Intensive Care Centre, 4th Floor, Golden Jubilee Wing, King’s College Hospital, London SE5 9RS, UK; anne.greenough{at}kcl.ac.uk

Objectives: To determine if insensible water loss (IWL) differed between infants exposed or not exposed antenatally to corticosteroids and to explore possible mechanisms for the early postnatal diuresis associated with antenatal steroid exposure.

Design: Retrospective analysis of prospectively collected data.

Setting: Level three neonatal intensive care unit.

Patients: Ninety six infants, median gestational age 27.5 weeks (range 23–33).

Main outcome measures: Comparison of the IWL, urine output and osmolality, fluid input, electrolyte imbalance, respiratory illness severity (as assessed by surfactant requirement, maximum peak inspiratory pressure, and inspired oxygen concentration), and cardiovascular status (as assessed by inotrope requirement) between infants with antenatal corticosteroid exposure and gestational age matched controls.

Results: The infants exposed to antenatal steroids differed significantly from the controls in having both a lower IWL (p = 0.0135) and a higher urine output (p = 0.0036) on day 1, and fewer developed hyponatraemia (p = 0.027) on day 2. Fewer of those exposed to antenatal steroids required inotropes (p = 0.06), but their respiratory status was similar to that of the controls.

Conclusions: Infants exposed to antenatal corticosteroids have a lower IWL. The results suggest that greater skin maturation, but also better perfusion rather than less severe respiratory status, explains the early diuresis in infants exposed to antenatal steroids.


Abbreviations: FIO2, fractional inspired oxygen concentration; GFR, glomerular filtrate rate; IWL, insensible water loss

Keywords: insensible water loss; corticosteroids; antenatal fluid balance; prematurity




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