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  • 1985-1989  (4)
  • Analytical Chemistry and Spectroscopy  (2)
  • Hydrocephalus  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Pericerebral collections after shunting (1987)
    Springer
    Child's nervous system 3 (1987), S. 97-102 
    Details
    ISSN: 1433-0350
    Keywords: Subdural hematoma ; Epidural hematoma ; Shunt complications ; Hydrocephalus ; CSF overdrainage ; Siphon effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Nineteen pericerebral collections (18 subdural and 1 epidural) occurred in a series of 682 consecutive initial shunt insertions for hydrocephalus in children, performed between 1976 and 1984. No collections were observed in 358 reoperations performed in the same patients during the same period. The incidence rate of this complication is nearly four times higher after 2 years of age than in younger children (6.5% versus 1.7%). The rate is also higher, regardless of age, in noncommunicating than in communicating hydrocephalus. Pericerebral collections are observed with high- as well as low-closing pressure valves. Pericerebral collections after shunting were diagnosed in 80% of the cases less than 2 months after surgery. They were asymptomatic in nearly 60% of the cases but could become symptomatic later when they were not treated. At the onset at least, these pericerebral collections are compensated by the outflow of an equal quantity of intraventricular CSF so that ICP is only moderately elevated. Postshunt pericerebral collections may be the consequence of CSF loss at the time of surgery. In most cases, however, they are due to a CSF overdrainage by the valve. This overdrainage, together with the reversal of CSF flow in the highly resistant CSF pathways of hydrocephalus, establishes a pressure lower in the ventricles than in the subarachnoid space and tends to open up the subdural space. The treatment of postshunt subdural collections is the insertion of a simple tubing without valve between the subdural space and the peritoneum, the ventriculoperitoneal shunt being left in place. With this treatment, more than 80% of the collections disappeared or were improved. No complications or secondary aggravation were observed in any of these patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00271133
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Acute intracranial hematomas in term neonates (1986)
    Springer
    Child's nervous system 2 (1986), S. 191-194 
    Details
    ISSN: 1433-0350
    Keywords: Neonatology ; Intracranial hematomas ; Hydrocephalus ; Dystocic deliveries ; Perinatal anoxia ; Bleeding disorders
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Acute intracranial hematomas in 17 term neonates are reported: 3 were subdural in the posterior fossa; 14 supratentorial, either subdural (8), intracerebral (1 frontal, 4 occipital) or intraventricular (1). The hematomas were aspirated in 3 cases and surgically evacuated in 10. In the remaining 4, the effusion was left in situ. Three patients died: 2 due to dramatic preoperative deterioration and 1 to hemostatic difficulties during surgery. In the 14 survivors, neurological sequellae are major in 3, nil or minor in 11. Comparison of these cases to the 110 others already published allows the following conclusions: (1) the cause of such hematomas is usually multifactorial, combining obstetrical trauma, anoxia and/or coagulation disorders; (2) early diagnosis of the hematoma requires early echography and/or tomodensitometry; (3) when the hematoma causes a midline shift, the authors advocate its early evacuation by aspiration, or craniotomy if it is clotted; (4) the prognosis is poor when there is associated severe perinatal anoxia; if there is no anoxia, the prognosis seems good, but as the follow-up is usually short, definite conclusions are difficult; (5) in our series hydrocephalus requiring treatment occurred in 2 of the 14 survivors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00706809
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  • 3
    Electronic Resource
    Electronic Resource
    Fast atom bombardment and collisional activation mass spectrometry of oligosaccharides related to xylans (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 17 (1988), S. 455-458 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The positive ion fast atom bombardment (FAB) mass spectra of oligosaccharides related to D-xylan and D-glucurono-D-xylans were investigated. Although the mass spectra of the underivatized oligosaccharides are relatively weak, they still offer reliable information on the molecular weight of these compounds from their [M + H]+ and [M + H + glycerol]+ ions. Esterification, glycosidation and/or partial methylation improve the relative abundances of the molecular and fragment ions with respect to those of the glycerol matrix. The mass spectra of these derivatized compounds also allow the determination of the mass of the monosaccharide units by the occurrence of more abundant and characteristic fragment ions. The differently linked D-xylobioses of the (1 → 2), (1 → 3) and (1 → 4) type cannot be distinguished on the basis of their mass spectra alone. The collisional activation (CA) spectra of the [M + H + glycerol]+ adduct ions, however, revealed that an unequivocal determination of the type of linkage in these isomers is possible. The small values of the discrepancy factors in the FAB CA spectra prove that CA mass spectrometry is, also in combination with FAB ionization, the most precise of the current mass spectrometric techniques.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200170607
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  • 4
    Electronic Resource
    Electronic Resource
    29Si and 13C NMR spectra of all possible pertrimethylsilylated β-D-xylopyranosyl-substituted methyl 4-O-β-D-xylopyranosyl-β-D-xylopyranosides assigned by 2D heteronuclear 1H-29Si and 1H-13C chemical shift correlations (1987)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 25 (1987), S. 75-79 
    Details
    ISSN: 0749-1581
    Keywords: Xylotriosides ; 29Si NMR ; 1H NMR ; 13C NMR ; 2D Homo- and hetero-nuclear NMR ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 29 and 13C NMR spectra of all possible pertrimethylsilylated β-D-xylopyranosyl-substituted methyl 4-O-β-D-xylopyranosyl-β-D- XYLOPYRANOSIDES ARE ASSIGNED BY HETERONUCLEAR 1H-X 2D NMR chemical shift correlation experiments, where X = C or Si. It is shown that the 29Si NMR spectra can be used for identification of the glycosidation site and ring assignments. The silicon chemical shifts do not follow any simple rule that would allow empirical assignment.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260250118
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    Paper (German National Licenses)
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