Published in:
01-12-2020 | Cranial MRI | Paediatric Neuroradiology
Regional impairment of cortical and deep gray matter perfusion in preterm neonates with low-grade germinal matrix-intraventricular hemorrhage: an ASL study
Authors:
Domenico Tortora, Francesco Maria Lo Russo, Mariasavina Severino, Alessandro Parodi, Paolo Massirio, Luca Antonio Ramenghi, Andrea Rossi
Published in:
Neuroradiology
|
Issue 12/2020
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Abstract
Purpose
The long-term impact of low-grade germinal matrix-intraventricular hemorrhage (GMH-IVH) on brain perfusion has not been fully investigated. We aimed to compare cortical and deep gray matter (GM) cerebral blood flow (CBF) obtained with pseudo-continuous arterial spin labeling (pCASL), among preterm neonates with and without low-grade GMH-IVH and full-term controls.
Methods
3T-pCASL examinations of 9 healthy full-term neonates (mean gestational age 38.5 weeks, range 38–39) and 28 preterm neonates studied at term-equivalent age were analyzed. Eighteen preterm neonates presented normal brain MRI (mean gestational age 30.50 weeks, range 29–31) and 10 low-grade GMH-IVH according to Volpe’s grading system (mean gestational age 32 weeks, range 28–34). A ROI-based mean CBF quantification was performed in 5 cortical (frontal, parietal, temporal, insula, occipital), and 4 subcortical GM regions (caudate, putamen, pallidum, thalamus) for each cerebral hemisphere. CBF differences were explored using a nonparametric analysis of covariance.
Results
Low-grade GMH-IVH hemispheres showed consistently lower CBF in all GM regions when compared with healthy preterm neonates, after controlling the confounding effect of gestational age, postmenstrual age, and birth weight P < .001, η2 = .394. No significant differences were observed between neonates with low-grade GMH and full-term controls. Healthy preterm neonates showed significantly higher CBF than full-term controls in parietal (P = .032), temporal (P = .016), and occipital cortex (P = .024), and at level of thalamus (P = .023) and caudate nucleus (P = .014).
Conclusion
Low-grade GMH-IVH is associated with lower CBF in posterior cortical and subcortical gray matter regions in preterm neonates, suggesting regional vulnerability of these developing brain structures.