Abstract
Preterm birth is associated with alteration in corticothalamic development, which underlies poor neurodevelopmental outcomes. Our hypothesis was that preterm neonates with CHD would demonstrate abnormal thalamic microstructure when compared to critically ill neonates without CHD. A secondary aim was to identify any association between thalamic microstructural abnormalities and perioperative clinical variables. We compared thalamic DTI measurements in 21 preterm neonates with CHD to two cohorts of neonates without CHD: 28 term and 27 preterm neonates, identified from the same neonatal intensive care unit. Comparison was made with three other selected white matter regions using ROI manual-based measurements. Correlation was made with post-conceptional age and perioperative clinical variables. In preterm neonates with CHD, there were age-related differences in thalamic diffusivity (axial and radial) compared to the preterm and term non-CHD group, in contrast to no differences in anisotropy. Contrary to our hypothesis, abnormal thalamic and optic radiation microstructure was most strongly associated with an elevated first arterial blood gas pO2 and elevated preoperative arterial blood gas pH (p < 0.05). Age-related thalamic microstructural abnormalities were observed in preterm neonates with CHD. Perinatal hyperoxemia and increased perioperative serum pH were associated with abnormal thalamic microstructure in preterm neonates with CHD. This study emphasizes the vulnerability of thalamocortical development in the preterm neonate with CHD.
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Abbreviations
- CHD:
-
Congenital heart disease
- NICU:
-
Neonatal intensive care unit
- ASD:
-
Atrial septal defect
- VSD:
-
Ventricular septal defect
- HLHS:
-
Hypoplastic left heart syndrome
- TGA:
-
Transposition of the great arteries
- DORV:
-
Double-outlet right ventricle
- FA:
-
Fractional anisotropy
- RD:
-
Radial diffusivity
- AD:
-
Axial diffusivity
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Acknowledgments
The authors thank Julie Castro, Lisa Padilla, and Hesham Mahmoud for their assistance with patient recruitment and data management. We thank Melanie Gieraltowski for manuscript preparation. Support for this study is provided by the National Institutes of Health: K23NS063371 to AP, P50NA019632 to JLW, 1UL1RR031986 to AP, JLW, LP; and Rudi Schulte Foundation to SB, CHLA Clinical Investigation Center, The Children’s Heart Foundation, supported in part by the NIH NCRR GCRC GRANT 5 MO1 RR00043-44 AT Childrens Hospital Los Angeles.
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Paquette, L.B., Votava-Smith, J.K., Ceschin, R. et al. Abnormal Development of Thalamic Microstructure in Premature Neonates with Congenital Heart Disease. Pediatr Cardiol 36, 960–969 (2015). https://doi.org/10.1007/s00246-015-1106-8
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DOI: https://doi.org/10.1007/s00246-015-1106-8