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  • Atomic scattering  (2)
  • Interventional neuroradiology  (2)
  • Tumor embolization  (2)
  • estradiol  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Physics, Section A 213 (1973), S. 309-316 
    ISSN: 0375-9474
    Keywords: Atomic scattering
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Physics, Section A 206 (1973), S. 531-544 
    ISSN: 0375-9474
    Keywords: Atomic scattering
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 35 (1993), S. 600-605 
    ISSN: 1432-1920
    Keywords: Central retinal artery occlusion ; Intra-arterial fibrinolysis ; Urokinase ; Interventional neuroradiology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We have treated 23 patients with central retinal artery occlusion by intra-arterial fibrinolysis, a method already in use for treatment of thromboembolic occlusion of the cerebral arteries. Fibrinolysis was carried out through a microcatheter placed in the origin of the ophthalmic artery. When ophthalmic artery cannot be catheterised, treatment can be carried out indirectly via the maxillary-ophthalmic anastomoses. In 18 cases urokinase was used in doses of 200000–1200000 units; in 5 patients recombinant tissue plasminogen activator was used. Six patients showed marked improvement or total recovery, and six partial recovery, with improvement of visual acuity or a field defect. The worst results were obtained in six patients where the mean delay between the appearance of symptoms and initiation of treatment was more than 20 h. Intra-arterial thrombolysis led to a better outcome in acute occlusion of the central retinal artery than might have been expected with conservative treatment. A good prognosis is to be expected when treatment starts within the first 6–8 h, when some vision remains and when there is less retinal oedema.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 30 (1988), S. 252-255 
    ISSN: 1432-1920
    Keywords: Motor evoked potentials ; Interventional neuroradiology ; Therapeutic embolization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Following transcranial electrical cortex stimulation motor evoked potentials (MEP) were monitored in 4 patients during 2 angiographic examinations and 4 therapeutic embolization procedures. Changes of MEP were observed in all 4 patients. Temporary decrease of MEP amplitudes as found in two patients was not followed by any additional postoperative neurological deficits. Incomplete recovery of amplitudes in one case associated with a corresponding hemiparesis post-angiographically. In the last patient amplitude reduction was found one week after the second embolization of an av-angioma. Consequently, an angiographic control was performed early, showing a partial revascularisation by newly opened fistulae which needed to be embolized again. In our opinion, monitoring of MEP during interventional neuroradiology is a sensitive method for early detection of impending neurological deficits. The use of MEP monitoring is discussed with respect to the advantages and limitations of conventional SEP monitoring. Because of the discomfort associated with electrical stimulation a magnetic stimulator may be used.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    European archives of psychiatry and clinical neuroscience 227 (1979), S. 241-260 
    ISSN: 1433-8491
    Keywords: Meningiomas ; Superselective angiography ; Tumor embolization ; Localization ; Vascularization ; Meningeome ; Superselektive Angiographie ; Embolisation ; Tumorlokalisation ; Tumorvascularisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 21 Patienten mit Meningeomen verschiedener Lokalisation und Größe werden unterschiedliche Embolisationstechniken und die Ergebnisse von insgesamt 25 präoperativen Tumorembolisationen beschrieben. Transfemorale Katheterisierungsmethoden waren dabei wegen der besseren Manipulierbarkeit der Katheter, der erzielbaren angiographischen Superselektivität und entsprechend exakteren Plazierung der Emboli direkten Techniken mit Punktion der Carotiden überlegen. Die Embolisationsresultate zeigten eine deutliche Abhängigkeit von der Meningeomlokalisation, wobei sich Konvexitätsmeningeome (6 Patienten) als besonders geeignet für eine vollständige Embolisation erwiesen. Bei Meningeomen der Falx mit größerer parasagittaler Ausdehnung, des lateralen Keilbeinflügels, der Sylvischen Fissur und des Cavum Meckeli (9 Patienten) waren operativ wie histologisch noch gute Embolisationseffekte nachweisbar. Dagegen waren Embolisationen bei ausschließlicher Tumorlokalisation an der Falx oder dem Tentorium sowie bei überwiegend internaversorgten Keilbeinflügelmeningeomen ohne therapeutischen Effekt. Bei Berücksichtigung der Tumorlokalisation und des Vascularisations-types sowie der Anwendung geeigneter superselektiver Angiographie- und Embolisationstechniken wird die präoperative Meningeomembolisation als wichtige Verbesserung der operativen Ausgangsbedingungen angesehen.
    Notes: Summary The different techniques and results are described for a total of 25 preoperative tumor embolizations in 21 patients with meningiomas of diverse localizations and extents. Transfemoral catheter techniques were superior to direct punctures of the carotid arteries because of the easier handling of the catheters, the better superselectivity of angiography, and, consequently, the more exact placement of the emboli. The results of the embolizations depended on the localization of the meningiomas. Meningiomas of the convexities (six patients) turned out to be particularly susceptible to complete embolizations. Satisfactory results were achieved operatively and histologically through embolization in meningiomas of the falx with large parasagittal expansion as well as in those of the lateral sphenoid wing, the sylvian fissure, and the cavum Meckeli (nine patients). Embolization of tumors which were localized exclusively at the falx, the tentorium, or of more medially situated meningiomas of the sphenoid wing were without beneficial effect, since these are predominantly vascularized by branches of the internal carotid arteries. Provided the localization and vascularization of a tumor are favourable, the application of superselective angiography and preoperative embolization represents an important improvement of the basic conditions for a later operation.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular neurobiology 16 (1996), S. 143-154 
    ISSN: 1573-6830
    Keywords: steroids ; neurosteroids ; progesterone ; estradiol ; nerve regeneration ; myelin ; Schwann cells ; oligodendrocytes ; astrocytes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 1. Some progesterone is synthesized within both the central and the peripheral nervous systems, where it regulates neurotransmission and important glial functions, such as the formation of myelin. Progesterone can thus be designated a “neurosteroid.” 2. Steroids act not only on the brain, but also on peripheral nerves, which offer many advantages to study the biological significance of locally produced neurosteroids: their remarkable plasticity and regenerative capacity and their relatively simple structure. 3. By using the regenerating mouse sciatic nerve as a model, we have shown that progesterone synthesized by rat Schwann cells promotes the formation of new myelin sheaths. Progesterone also increases the number of myelinated axons when added at a low concentration to cocultures of Schwann cells and sensory neurons. 4. These findings show a function on myelination for locally produced progesterone and suggest a new pharmacological approach of myelin repair.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1573-6830
    Keywords: oligodendrocytes ; progesterone ; estradiol ; myelin ; myelin basic protein ; CNP-ase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    HNO 47 (1999), S. 816-820 
    ISSN: 1433-0458
    Keywords: Schlüsselwörter Glomus jugulare ; Bilateral ; Embolisation ; Key words Bilateral glomus jugulare tumors ; Paragangliomas ; Tumor embolization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Bilateral glomus jugulare tumors are rare. However, their treatment should preserve not only the function of the facial nerve but also the caudal cranial nerves and the middle ears in order to avoid bilateral hearing losses. Further, venous cerebral drainage has to be ensured in order to avoid cerebral hypertension and hemorrhagic infarction after bilateral jugular ligations. In the case presented bilateral glomus jugulare tumors required super-selective angiography and embolization. Complete tumor removal on both sides was then possible by a transmastoid-transcervical approach without any further functional deteriorations. Middle ear function was preserved on both sides by temporary ventral translocation of the posterior wall of the auditory meatus. As the sigmoid sinus and internal jugular vein had been ligated during initial previous surgery, venous drainage was tested one year later by angiography and compression of the remaining internal jugular vein. A sufficient collateral circulation was found and permitted surgery on the second side.
    Notes: Zusammenfassung Beidseitige Glomus-jugulare-Tumoren stellen eine Rarität dar. Neben der Funktion des N. facialis muß bei ihrer Entfernung auch die Funktion der kaudalen Hirnnerven berücksichtigt werden. Die Funktionserhaltung des Mittelohrs ist ebenfalls anzustreben, um einen beidseitigen Schalleitungsblock zu vermeiden. Die venöse zerebrale Drainage muß gesichert werden, da eine beidseitige Ligatur des Sinus sigmoideus zur zerebralen venösen Hypertension führen würde. Am Beispiel eines großen bilateralen Glomus-jugulare-Tumors der Klasse C2 ermöglichte die superselektive Angiographie und Embolisation die beidseitige vollständige Tumorentfernung ohne Funktionseinschränkungen über einen transmastoidalen-transzervikalen Zugang. Durch temporäre Ventralverlagerung der hinteren Gehörgangswand gelang auch die Erhaltung der Mittelohrfunktion. Wegen der Ligatur der V. jugularis interna und des Sinus sigmoideus auf der 1. Seite konnte die 2. Seite erst 1 Jahr später operiert werden, nachdem die Angiographie und Kompression der verbliebenen V. jugularis interna ausreichende venöse Kollateralen bestätigt hatte.
    Type of Medium: Electronic Resource
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