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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 105 (1990), S. 30-34 
    ISSN: 0942-0940
    Keywords: Cerebral blood flow ; moyamoya disease ; internal carotid artery occlusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A study has been made of the cerebral blood flow (CBF) in moyamoya disease from the perspective of hemispheric cerebral blood flow and regional CBF (rCBF). The material includes 21 children between the ages of 5 and 15 years with moyamoya disease, and 19 adult moyamoya cases-all of which had virtually no neurological symptoms at the time of the study. CBF was measured using the133Xe intravenous injection method. Comparsion was made with the measurements from 16 normal children and 14 normal adults. Study was also made of the relationship between the angiographic stage of the disease and the CBF. With the exception of the more elderly patients, CBF was found to be significantly lower in the moyamoya cases than in normal subjects of the same age group. In all age groups, the distribution of rCBF showed a dominant posterior distribution, dissimilar to the dominant anterior distribution found in the normals. Among the juvenile moyamoya cases, there was a tendency toward decreasing hemispheric blood flow together with advancing disease-as determined angiographically. Moreover, with advancing stages of the disease, there was a continuing transition from the normal pattern of frontal dominance to one of occipital dominance. This dominance of posterior rCBF is thought to be a characteristic feature of moyamoya disease.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 105 (1990), S. 107-111 
    ISSN: 0942-0940
    Keywords: Cerebral blood flow ; moyamoya disease ; autoregulation CO2 response
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In order to clarify the cerebrovascular response in Moyamoya disease, the autoregulation and CO2 response was investigated using the81mKr continuous cerebral blood flow (CBF) measurement technique. A total of 32 measurements were made over the anterior and posterior circulation in 16 Moyamoya patients (seven adults, nine children). CBF measurements were made during four loading trials (hypertension, hypotension, CO2 inhalation and hyperventilation). Study was then made of the vascular response of the frontal lobe, perfused by the internal carotid artery (ICA), and the occipital lobe and cerebellum, perfused by the vertebral artery (VA). Deficits of autoregulation were more severe among the juvenile cases in response to hypotension than to hypertension in both the ICA and VA regions, but the deficits were mild. The CO2 response to hypercapnea in the juvenile cases tended to be abnormal in both the ICA and VA regions. Both adult and juvenile patients showed deficits in the ICA region in response to hyperventilation, some of whom exhibited paradoxial responses. Notable differences in the severity of the deficits of the vascular response in adult and juvenile cases were seen, with the deficits in the response being more severe among the juvenile cases. Moreover, significant regional differences in the deficits were also found.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 77 (1988), S. 33-38 
    ISSN: 1432-0533
    Keywords: Rathke's cleft cyst ; Immunohistochemistry ; Pituitary hormones ; Intermediate filament ; Squamous metaplasia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary An immunohistochemical study was made of ten cases of asymptomatic and three cases of symptomatic Rathke's cleft cyst. The cysts in the asymptomatic cases had monolayer columnar or cuboidal epithelium. Within the epithelium, cells which were positive for at least one of the pituitary hormones were found. The rate of positive reactions for these six pituitary hormones was between 70% and 100%. In contrast, the cysts in the symptomatic cases had an epithelium which was partly stratified squamous and partly squamous epithelium, and none of the pituitary hormones were found in them. Therefore, when a Rathke's cleft cyst enlarges to the extent that clinical symptoms are produced, we consider that changes have already occurred in structure and function of the cyst epithelium. In addition, we believe there is a tendency for monolayer epithelia to undergo squamous metaplasia and for cells which are positive for pituitary hormones to change into non-granulated cells.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0942-0940
    Keywords: Cerebral infarction ; brain swelling ; mannitol ; glycerol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Using our previously published “incomplete cerebral hemispheric infarction model in dogs” (produced by simultaneous ipsilateral occlusions of the anterior cerebral artery at the branching of the ethmoidal artery from its A1 portion, the A2 portion, the internal carotid artery, the posterior communicating artery, the posterior cerebral artery, and the anterior cerebellar artery), two, four, or six hours occlusion of blood flow was undertaken. Observations were then made on the degree of brain swelling following recirculation due to administration of mannitol or glycerol solutions. Furthermore, the leakage of Evans blue was investigated to determine the damage to the blood brain barrier. 1. In the animals given mannitol or glycerol, brain swelling was suppressed, following two hours occlusion. In the animals given mannitol, however, brain swelling was not suppressed after four or six hours occlusion. 2. After two hours occlusion in the animals given mannitol, leakage of Evans blue was slight compared with the untreated group. In the six hours occlusion groups, severe leakage of Evans blue was seen in both the untreated animals and the mannitol-treated animals. After two hours occlusion, in some animals which had been given glycerol, severe leakage of Evans blue was seen, even when there was little brain swelling.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 24 (1971), S. 245-252 
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Eleven cases of aneurysm persisting after direct intracranial operation have been reported from a series of 315 aneurysms (274 cases) treated in our clinic. Postoperative angiography is necessary in every case because it reveals whether a clip or ligature is effective or not. An aneurysm remaining after direct operation disappears spontaneously if its neck has been narrowed by a clip or ligature. Reoperation must be considered if the clip has been placed on the aneurysmal body, if the clip has slipped off the aneurysm, or if the residual aneurysm is seen at follow-up angiography to be enlarging.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 47 (1979), S. 37-44 
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We review 36 patients with recurrent attacks before radical surgery during hospitalization and evaluate various factors which seem to contribute to the recurrence of haemorrhage.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 47 (1979), S. 53-61 
    ISSN: 0942-0940
    Keywords: Bacterial endocarditis ; brain abscess ; myotic aneurysm ; supravalvular aortic stenosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Report of a case of intracranial mycotic aneurysm accompanied by brain abscess, which occured as a complication of bacterial endocarditis. Excision of the aneurysm and total removal of the abscess produced a good result.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 44 (1978), S. 97-106 
    ISSN: 0942-0940
    Keywords: Cerebral vasospasm ; vasospasmogenic substance ; oxyhaemoglobin ; methaemoglobin ; sodium nitrite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Fresh blood and supernatants of blood-CSF mixtures incubated for 1 to 15 days were applied to the basilar artery of adult cats, and the degree of constriction was measured with a surgical microscope. The constriction due to fresh blood was weak and transient. It seems possible to assume that serotonin isolated from platelets participates greatly in the transient vasoconstriction induced by fresh blood. Supernatants of blood-CSF mixtures incubated for three days had weak activity in comparison with the powerful and long-lasting activity of those incubated for seven days. Furthermore, mixtures incubated for 15 days had little or no activity. This change in the vasoconstrictive activity was similar to, and coincides chronologically with clinical late spasm following subarachnoid haemorrhage34. We investigated the vasospasmogenic substance in the seventh day mixture. Heat coagulation, ultrafiltration, sephadex G-100 gel-chromatography, disc-electrophoresis, and Spectrophotography show that extracellular oxyHb has a strong spasmogenic activity. In the 15th day mixture, oxyHb is spontaneously converted to metHb. Experimentally, oxyHb has a strong vasoconstrictive activity, and metHb has no vasoconstrictive activity. We have had success in oxidizing oxyHb into metHb with sodium nitrite, thus preventing experimental vasospasm.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 50 (1979), S. 259-264 
    ISSN: 0942-0940
    Keywords: Intracranial saccular aneurysm ; conservative treatment ; follow-up study
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Despite our basic policy of performing intracranial definitive surgery whenever possible in cases of intracranial saccular aneurysms, we have had 80 patients with non-radically treated aneurysms. This investigation is based on an analysis of the prognosis in 54 cases where we refused definitive surgery; it provides insight into the factors and circumstances leading to the use of treatment of secondary choice, conservative rather than definitive treatment.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 62 (1982), S. 259-264 
    ISSN: 0942-0940
    Keywords: Trapped fourth ventricle ; arteriovenous malformation ; hydrocephalus ; ventriculo-peritoneal shunting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A case of cystic dilatation of the fourth ventricle which developed after surgery on an arteriovenous malformation is presented with a discussion of the pathogenesis of the trapped fourth ventricle.
    Type of Medium: Electronic Resource
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