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  • 1
    ISSN: 1432-0533
    Keywords: Key words Human immunodeficiency virus ; Myopathy ; Mitochondria ; Zidovudine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract There is controversy as to whether zidovudine (ZDV) induces a mitochondrial myopathy that is distinguishable from human immunodeficiency virus (HIV)-associated myopathy in ZDV-naive patients. Mitochondrial abnormalities were evaluated in skeletal muscle obtained from 18 HIV-positive, ZDV-exposed patients, and 9 who were drug naive. All patients had clinical myopathy, and underwent neuromuscular evaluation with information recorded on timing and dosage of ZDV. All underwent muscle biopsies and samples were examined without knowledge of clinical history or ZDV status. Biopsy samples were evaluated by light and electron microscopy. Mitochondrial abnormalities were seen in ZDV-treated and -naive groups, and did not correlate with ZDV exposure or cumulative ZDV dosage. Mitochondrial abnormalities displayed significant correlation with the presence and severity of myofiber degeneration on biopsy, regardless of ZDV status. As mitochondrial abnormalities reflect myofiber degeneration, present in both patient groups, they may not be used as evidence of primary mitochondrial dysfunction. The etiology of myofiber degeneration in patients with HIV infection, whether ZDV-exposed or -naive, remains unclear.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0533
    Keywords: Key words Human immunodeficiency virus ; Myopathy ; Mitochondria ; Zidovudine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract There is controversy as to whether zidovudine (ZDV) induces a mitochondrial myopathy that is distinguishable from human immunodeficiency virus (HIV)-associated myopathy in ZDV-naive patients. Mitochondrial abnormalities were evaluated in skeletal muscle obtained from 18 HIV-positive, ZDV-exposed patients, and 9 who were drug naive. All patients had clinical myopathy, and underwent neuromuscular evaluation with information recorded on timing and dosage of ZDV. All underwent muscle biopsies and samples were examined without knowledge of clinical history or ZDV status. Biopsy samples were evaluated by light and electron microscopy. Mitochondrial abnormalities were seen in ZDV-treated and -naive groups, and did not correlate with ZDV exposure or cumulative ZDV dosage. Mitochondrial abnormalities displayed significant correlation with the presence and severity of myofiber degeneration on biopsy, regardless of ZDV status. As mitochondrial abnormalities reflect myofiber degeneration, present in both patient groups, they may not be used as evidence of primary mitochondrial dysfunction. The etiology of myofiber degeneration in patients with HIV infection, whether ZDV-exposed or -naive, remains unclear.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 94 (1997), S. 140-145 
    ISSN: 1432-0533
    Keywords: Key words Glucose transporter ; GLUT1 ; GLUT3 ; HIV
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Abnormalities in cerebral glucose metabolism have been demonstrated in patients with AIDS dementia complex (ADC), with increased consumption in early disease and decreased utilization in late stages. The basis of these changes is unknown. Accordingly, a pilot study was undertaken to determine whether levels of cerebral glucose transporters GLUT1 and GLUT3 were altered by HIV disease. Frontal gray and white matter membrane preparations from patients with HIV encephalitis (HIVE), HIV infection without parenchymal neuropathology, and non-infected controls were utilized in quantitative immunoblots to measure GLUT1 and GLUT3. Results were expressed as a ratio of glucose transporter to structural protein actin. Within-group patient variability was great, precluding statistically significant differences between groups for any one brain region. However, when data for gray and white matter was pooled, results obtained statistical significance, with levels of GLUT1 increasing in HIV infection without neuropathology, and declining with HIVE. Increased GLUT1 in HIV infection without parenchymal neuropathology may be important in the biology of increased glucose consumption described with early ADC. With progression to HIVE, reduced levels of glucose transporters may contribute to late stage hypometabolism.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0533
    Keywords: Key words Pure autonomic failure ; Lewy bodies ; Autopsy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Pure autonomic failure (PAF; also known as idiopathic orthostatic hypotension or Bradbury-Eggleston syndrome) is an uncommon sporadic disorder, characterized by autonomic failure without other neurological deficits and histopathologically by cell loss in intermediolateral columns and sympathetic ganglia. Few postmortem studies of patients with PAF have been reported in the literature, and none have demonstrated Lewy bodies in distal axons, although this has been described as a feature in Parkinson’s disease with autonomic failure. We report a patient with PAF who had orthostatic hypotension and urinary symptoms for 15 years prior to death at the age of 63 years. Postmortem findings included typical and atypical Lewy bodies in the substantia nigra, locus ceruleus, substantia innominata, and sympathetic ganglia, as well as in autonomic axons in the epicardial fat, autonomic nerve fascicles in periadrenal adipose tissue, and autonomic nerves in the muscularis of the urinary bladder. Sites of autonomic nerve involvement correlated with clinical symptomatology, and thus were a valuable observation in the complete autopsy. Systemic autopsy results should be reviewed carefully in patients with PAF, as Lewy bodies in this disease may be seen in distal axons at a great length from their primary cell bodies.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 41 (1999), S. 847-849 
    ISSN: 1432-1920
    Keywords: Key words Granulomatosis ; Wegener's ; Meninges ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Involvement of the brain and meninges is rare in Wegener's granulomatosis (WG); it has been reported in 1.2–8 % of patients. Meningeal involvement in WG has been reported in imaging as being confined to the duramater, and is thought to represent granulomatous infiltration. We present a case of WG with abnormal pial enhancement and involvement of the perivascular spaces on MRI, pathologically proven to represent granulomatous infiltration due to the primary disease rather than to infection.
    Type of Medium: Electronic Resource
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