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  • 1
    ISSN: 1432-1076
    Keywords: Magnetic resonance imaging ; Spectroscopy ; Imaging, Canavan disease ; Brain
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We present a 2-year-old boy and a 6-year-old girl with mild Canavan disease (CD). Aspartoacylase activity in skin fibroblasts was deficient. Magnetic resonance imaging (MRI) of the brain did not show the prominent leucodystrophy previously reported in CD, but there was a hyperintense signal from the lentiform nuclei and the heads of the caudate nuclei on the T2-weighted MR images. This suggests a specific vulnerability of the corpus striatum in these patients. In the older patient, the white matter became affected at the age of 6 years. Proton magnetic resonance spectroscopy (1H-MRS) of white matter revealed a normal concentration of N-acetyl-l-aspartate (NAA) and a markedly decreased concentration of choline containing compounds (Cho) in the boy but a normal ratio of NAA to Cho in the girl. We conclude that deficient NAA catabolism affects myelin metabolism. This may present as changes in the striatum and/or as a low concentration of Cho before leucodystrophy appears on MRI.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 150 (1991), S. 366-369 
    ISSN: 1432-1076
    Keywords: Cerebral blood flow ; Visual evoked potentials ; Aminophylline ; Newborn infants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effect of intravenous aminophylline (10 mg/kg) on cerebral blood flow (CBF) and single flash visual evoked potential (VEP) was investigated in 16 preterm infants (range 25–34 weeks). All infants were weaned from mechanical ventilation and had normal brain ultrasonograms. CBF, PaO2, PaCO2, mean arterial blood pressure and VEP were recorded before, immediately after and 1 h after the administration of aminophylline. When intra-individual changes in PaCO2 were taken into account, mean CBF was 5.5% lower than the baseline value immediately after administration of aminophylline, but this was not statistically significant (P=0.14). After 1 h, however, CBF had decreased by a mean of 13.8% (P=0.0003). The cerebral function estimated from VEP was not influenced by aminophylline since the VEP configuration and the VEP parameters remained constant throughout the study. It is concluded that aminophylline reduces cerebral blood flow in stable, preterm infants and apparently without inducing adverse effects on cerebral function.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 147 (1988), S. 315-316 
    ISSN: 1432-1076
    Keywords: Cerebral blood flow ; Indomethacin ; Patent ductus arteriosus ; Premature infants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Central blood flow (CBF) was estimated by an intravenous 133-xenon technique in six preterm infants before and after administration of indomethacin for closure of patent ductus arteriosus. CBF fell in all infants (range 12%–40%), the mean fall was 24% (P〈0.005). Though none of the infants showed signs of impaired cerebral function during or following the injections, the results do not indicate whether or not the use of indomethacin is a potential hazard.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1998
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The local cerebral vascular response to hyperventilation vas investigated in five distressed, intubated infants by means of a T2* sensitive gradient-echo MRI technique at 1.5 T. In one preterm infant, the MR signal change during hyperventilation was sparse. In four term infants, the mean MR signal of the brain slice investigated decreased by 1.2–2.6% per kPa change inPCO2 as a reflection of decreased cerebral blood flow during hyperventilation. Pixel-wise analysis revealed absence of vascular response in the basal ganglia, the thalamus or in the occipital region. In two adult controls, who hyperventilated voluntarily, the vascular reactivity was homogeneously distributed predominantly over the grey matter. The experiments demonstrate that local impairment of vascular CO2 reactivity in the distressed infant brain can be detected by T2* sensitive gradient-echo MRI, which is also known as functional MRI.
    Type of Medium: Electronic Resource
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