Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 0942-0940
    Keywords: Cerebral vasospasm ; observer variation ; diagnostic accuracy ; Kappa statistics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In clinical practice and in many reported studies about incidences and time courses of vasospasm the angiographic spasms are judged by eye without clear definition of vessel narrowings. To evaluate the reliability of this diagnostic method two experienced neuroradiologists and two experienced neurosurgeons independently in two sessions, examined 30 carotid angiograms performed after an aneurysmal subarachnoid haemorrhage. The intra- and inter-observer agreements for the absent/present and localization diagnosis of vasospasm were calculated by means of Kappa statistics. Kappa values for both intra- and inter-observer agreement showed great variability and in general most of the agreements were not much better than chance expected agreement. The diagnostic method of judging angiographic vasospasm by eye without clear-cut definitions of vessels narrowings is unreliable and should not be used in the future, neither in clinical practice nor in research.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1468-2982
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In eight patients carotid angiography was required for evaluation of transient neurological attacks. Cerebral blood flow results, angiography and clinical observations subsequently suggested the diagnosis of migraine. We measured plasma concentrations of substance P(SP), neuropeptide Y (NPY), calcitonin gene-related peptide (CGRP) and vasoactive intestinal peptide (VIP) in repeated blood samples obtained from the carotid artery and the internal jugular vein in conjunction with cerebral angiography followed by 4 to 6 repeated recordings of regional cerebral blood flow (rCBF) with the intracarotid Xenon-133 injection technique. This technique is known to induce attacks of migraine with aura in many sufferers. Four patients developed aura symptoms. In three this was succeeded by throbbing headache, Typical, migraine-related, focal hypoperfusion occurred in conjunction with the aura symptoms. The remaining four patients had no symptoms or rCBF changes. There were no systematic or statistically significant changes over time in arterial-venous plasma concentrations or in the release rates of any of the peptides. All migraineurs had an overall elevated mean CGRP value compared to control values from the literature. The overall plasma levels of the potent vasoconstrictor NPY were higher (p 〈 0.10) in the group that developed symptoms and rCBF changes (136 pmol/l) than in the non-symptomatic group (97 pmol/l). The difference in NPY levels could perhaps be associated with the focal rCBF decrease seen in the attack group.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Physics B (Proceedings Supplements) 28 (1992), S. 163-168 
    ISSN: 0920-5632
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 14 (1977), S. 5-13 
    ISSN: 1432-1920
    Keywords: Computed tomography ; Pituitary tumors ; Juxtasellar tumors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary During the first two years with the 160×160 matrix EMI scanner at Rigshospitalet, Copenhagen 108 consecutive patients referred with the suspicion of intra- or juxtasellar tumor were subjected to 166 computed tomography (CT) examinations. The X-ray attenuation and contrast enhancement patterns of the various lesions were analyzed. In general, it was difficult to correlate these parameters with the histopathological features. Arachnoid cysts, however, had typical low preinjection attenuation and no contrast enhancement. Chromophobe and eosinophilic pituitary adenomas rarely contained calcium and only in minute amounts, hardly visible on the polaroid pictures. Craniopharyngiomas and low grade suprasellar gliomas frequently contained large calcifications. Grade I gliomas, when located in the optic nerves or hypothalamus, showed significantly higher contrast enhancement than elsewhere in the brain. Three purely intrasellar adenomas were demonstrated with CT only. The diagnostic accuracy of CT was compared to that of carotid angiography, PEG and plain skull films in the lesions verified by initial operation (n=32). CT gave the highest accuracy of the four methods, but the accuracy of CT differed statistically only from that of carotid angiography.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 5 (1973), S. 215-219 
    ISSN: 1432-1920
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé L'enregistrement de la pression intraartérielle et de la vitesse du pouls a été fait au cours de 77 examens artériographiques chez 35 patients. 28 angiographies carotidennes et vertébrales n'amènent aucun changement hémodynamique. L'injection de contraste dans l'aorte ascendante (34 séries) et dans l'aorte abdominale (15 séries) provoque un changement dans la pression sanguine, consistant en une augmentation initiale suivie d'une chute lente et marquée et d'un retour final à la valeur originale. Ces changements sont plus prononcés chez les patients au coma dépassé que chez ceux où la circulation cérébrale est normale. Une tachycardie simultanée et compensatrice a été observée seulement à la fin. L'augmentation de la pression initiale a été interprêtée comme due au volume additionnel de fluide et à la chute subséquente à la vasodilatation générale par l'action périphérique du contraste medium. Un mécanisme faisant intervenir les centres vasomoteurs dans le cerveau est improbable.
    Abstract: Zusammenfassung Während 77 arteriographischen Untersuchungen von 35 Patienten erfolgte eine Registrierung des intraarteriellen Drucks und der Pulsfrequenz. 28 Angiographien der A. carotis communis oder der A. vertebralis erwirkten keine hämodynamische Änderungen. Eine Injektion mit Kontrastmittel in die Aorta ascendens (34 Serien) und in die Aorta abdominalis (15 Serien) lösten Änderungen des Blutdrucks aus, und zwar in Form eines initialen Anstiegs mit einem darauffolgenden langsamen, ausgesprochenen Abfallen und einem abschließenden Anstieg auf den Ausgangswert. Bei hirntoten Patienten waren diese Änderungen ausgesprochener als bei Patienten mit normaler Zerebralfunktion. Nur bei den letzterwähnten beobachtete man eine gleichzeitige kompensatorische Tachykardie. Den initialen Anstieg des Blutdrucks erklärte man sich durch die zugeführte Flüssigkeitsmenge und das darauffolgende Abfallen durch eine generelle Vasodilatation dank der peripheren Wirkung des Kontrastmittels. Ein die vasomotorischen Zentren des Gehirns involvierender Mechanismus ist unwahrscheinlich.
    Notes: Summary The intraarterial pressure and pulse rate were recorded during 77 arteriographic procedures in 35 patients. No haemodynamic changes were produced in 28 common carotid or vertebral angiograms in patients with normal cerebral circulation times. Contrast injection into the ascending aorta (34 series) and abdominal aorta (15 series) caused various changes in the blood pressure, viz. an initial rise followed by a slow but marked fall and finally a return to the original value. These changes were more pronounced in so-called “brain-dead” patients than in patients with normal cerebral circulations; a simultaneous compensatory tachycardia was seen only in the latter subjects. The initial rise in pressure was interpreted as being due to the additional volume of fluid, and the subsequent fall due to a general vasodilatation resulting from the peripheral action of the contrast medium. A mechanism involving the vasomotor centres in the brain is considered unlikely.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...