Effect of small for gestational age on hemodynamic parameters in the neonatal period

Abstract

Objective: The time course over which hypertension develops in children with a history of growth restriction has not been fully elucidated. The purpose of this study was to determine whether commonly obtained hemodynamic parameters were different between small for gestational age (SGA) and appropriate for gestational age (AGA) neonates. Methods: This was a retrospective case–control study matching 24 SGA neonates in a 1:2 fashion with 48 AGA neonates delivered during the same gestational week. Hemodynamic parameters were evaluated during the first week of life and the week prior to discharge. Results: There were no differences in blood pressure (BP) parameters during the first week of life. Compared to AGA controls, SGA neonates had a significantly lower heart rate (HR) at birth (148.2 ± 19.2 vs. 159.2 ± 17.1, p < 0.001), and a greater need for vasopressor support (OR 5.66; 95% CI 2.28, 14.04). The SGA neonates had a lower systolic BP during the week prior to discharge (68.3 ± 1.2 vs. 73.5 ± 1.2 mmHg, p < 0.001). Conclusions: SGA newborns had a lower HR at birth and greater need for vasopressor support during the first week of life despite similar BP parameters. SGA newborns had a lower systolic BP prior to discharge. Further studies are needed to understand the progression to adult hypertension.

Keywords::

• Blood pressure
• heart rate
• intrauterine growth restriction
• neonate
• SGA

Acknowledgements

This article is presented at the 57th Annual Society for Gynecologic Investigation Meeting, Orlando, FL, 25 March 2010.

Declaration of Interest: This work is supported in part by NIH/NCRR Colorado CTSI Grant Number UL1 RR02578. Contents are the authors’ sole responsibility and do not necessarily represent official NIH views. The authors report no declarations of interest.