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PEDIATRICS Vol. 103 No. 4 April 1999, pp. 724-729

Cerebral Magnetic Resonance Imaging and Ultrasonography Findings After Neonatal Hypoglycemia

Received Jun 1, 1998; accepted Sep 22, 1998.

Anne Kinnala*, Hellevi RikalainenDagger , Helena Lapinleimu*, Riitta ParkkolaDagger , Martti KormanoDagger , and Pentti Kero*

From the Departments of * Pediatrics and Dagger  Diagnostic Radiology, University of Turku, Turku, Finland.

Objective.  The aim of this study was to investigate sequential neuroradiologic changes in the brains of infants after transient neonatal hypoglycemia. We used magnetic resonance imaging (MRI) and ultrasonography (US) head scans.

Methods.  Eighteen symptomatic full-term infants whose serum glucose concentrations were <= 45 mg/dL (2.5 mmol/L) without any other diseases were included in the hypoglycemic group. MRI and US head scans were performed at full-term age and at the age of 2 months. The imaging results were compared with the findings of MRI and US scans in 19 healthy normoglycemic term newborn infants at the respective ages. The neurologic outcome was followed in the both groups.

Results.  MRI or US showed evidence of abnormality in 39% the hypoglycemic infants. MRI detected more abnormalities in the brains than US. Four infants showed patchy hyperintensity lesions either in the occipital periventicular white matter or the thalamus on T1-weighted images. These lesions had a good tendency to recover and only 1 of these infants appeared to be neurologically affected. Of the 19 controls, 10% (2 of 19) had caudothalamic cysts, which were detected both with MRI and US. The relative risk of the hypoglycemic child compared with nonhypoglycemic child, to have any abnormality detected in the brain, was 3.7, with a 90% confidence interval from 1.11 to 12.28.

Conclusions.  Postnatal full-term MRI and US scans showed abnormalities four times more often after transient neonatal hypoglycemia than in the healthy control group. However, most often lesions were absent 2 months later. The clinical relevance of these abnormal findings remains to be clarified with detailed neurologic examinations and follow-up.  Key words:  magnetic resonance imaging, ultrasonography, neonatal hypoglycemia.


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