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: 1433-0407
    Keywords: Schlüsselwörter Dissektion ; Intramurales Hämatom ; Atherom ; Therapie ; Key words Dissection ; Intramural hematoma ; Atheroma ; Therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Improved methods of imaging the cerebral vascular system have increased the detection of traumatic or spontaneous dissection of the vertebral and carotid arteries. Especially MRI allows direct demonstration of intramural hematomas that are a sign of dissection of the vessel wall. We report on a patient who had an acute onset of dysarthria and monocular blurred vision, which recurred several times. Doppler ultrasound showed stenosis in both internal carotid arteries with reduced velocity of the flow; angiography confirmed the stenosis, showing a long stretch of stenosis (70%) of the right and a short stretch of stenosis (60%) of the left internal carotid arteries. MRI demonstrated a narrowing of the lumen by an intramural mass, whose signal characteristics were typical for blood. The MRI findings were thus consistent with the diagnosis of a spontaneous dissection of the carotid arteries. Since the Doppler ultrasound follow-up showed no change during the following 3 days, we interpreted the MRI findings as an indication of bleeding in an atheroma. The carotid disobliteration, performed first on the left side and later on the right side, confirmed this interpretation. Since stenosis due to a fissuring atheroma or bleeding in an atheroma requires different therapy than a dissection, it is thus important to consider the possible differential diagnosis in interpreting the MRI.
    Notes: Zusammenfassung Durch die Fortschritte in den bildgebenden Verfahren werden traumatische, bzw. spontane Dissektionen der A. carotis und der A. vertebralis zunehmend häufiger diagnostiziert. Insbesondere die Magnetresonanztomographie ermöglicht dabei einen direkten Nachweis von intramuralen Hämatomen als Zeichen der Dissektion. Wir berichten nun über einen Patienten, der akut beginnend und im Verlauf rezidivierend eine Dysarthrie sowie monokuläre Sehstörungen des linken Auges bemerkte. Dopplersonographisch fand sich beidseits, rechts betont, eine im Bulbus der A. carotis communis beginnende, bis in die A. carotis interna reichende Stenose, in der arteriellen digitalen Subtraktionsangiographie eine langstreckige etwa 70%ige A.-carotis-interna-Stenose rechts und eine kurzstreckige etwa 60%ige Stenose links. Diese Befunde ließen sowohl an eine ausgeprägte arteriosklerotische Makroangiopathie als auch an eine Dissektion denken. In der Kernspintomographie fand sich dann eine verdickte Gefäßwand der A. carotis interna beidseits mit einem schmalen Restlumen. Dieses wurde beidseits von in der T1w-Gewichtung mit selektiver Fettunterdrückung hyperintensivem Gewebe, am ehesten einem intramuralen Hämatom entsprechend, eingeengt. Dieser Befund ließ dann an eine beidseitige Dissektion der A. carotis interna denken. Auf Grund der in der Duplexsonographie über Tage unveränderten Befunde wurde das Bild dann als eine Einblutung in Wandatherome beidseits bei arteriosklerotischer Makroangiopathie gewertet und der Patient wegen der rezidivierenden, hämodynamisch bedingten Symptomatik operiert. Bei der zweizeitig durchgeführten Karotisdesobliteration beidseits bestätigte sich der Verdacht auf intramurale Atherome. Intramurale Atherome mit oder ohne Einblutung sind eine kernspintomographische Differentialdiagnose zu intramuralen Hämatomen bei Karotisdissektion.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 83 (1986), S. 131-137 
    ISSN: 0942-0940
    Keywords: Cerebral aneurysm ; aneurysm growth ; rupture ; turbulence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Intra-operative Doppler recordings were carried out on cerebral saccular aneurysms in 12 patients. Distinct fluctuations of flow superimposed on the pulse wave were seen in 6 patients. The fluctuations appeared to be periodic with measured period lengths of 60 to 150 msec. In 3 other patients flow irregularities could be discerned acoustically but a definite periodicity could not be visualized on screen. In 3 patients flow appeared smooth during the entire pulse cycle, acoustically as well as visually. Concomitant flow observations in glass model aneurysms also revealed flow instabilities in certain aneurysm types at a Reynold's number of 300. All observed irregularities of flow were observed in zones of deceleration of flow in the models. Signs of fully developed turbulence were not found, neither in human aneurysms nor in the glass models. It appears likely that the fluctuations of flow induce vibrations of the aneurysmal wall and contibute to aneurysm progression and eventual rupture.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 100 (1989), S. 74-78 
    ISSN: 0942-0940
    Keywords: Cerebral aneurysm ; pathogenesis ; growth ; rupture ; yield stress ; stress relaxation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The strength of aneurysm walls obtained intraoperatively or at autopsy immediately after death was evaluated by measurements of the force response to one-directional stretch and compared to the walls of intracranial arteries. The maximum stress that aneurysm tissue could tolerate was found slightly lower than in arteries, which is most probably due to the amount of immature forms of collagen. The stress resistance of aneurysms and arterial tissue decayed over a period of several hours. The relaxation curve could be approximated by the sum of 2 exponential terms. The half decay times of these terms were found identical in aneurysms and arteries, they appear to be collagen characteristics. The strength measured in vitro was compared to the stress in vivo, which was calculated on the basis of blood pressure and aneurysm radius. The stress tolerated by aneurysm walls over a period of 24 hours was found to be in the range of the stress that is imposed in vivo by the mean blood pressure. Arteries resisted stresses corresponding to pressures 10 to 20 times higher than physiological values. The thickness of the aneurysm walls correlated with the aneurysm radius in a linear fashion. It is suggested that aneurysm growth can be understood as passive yield to blood pressure, and reactive healing and thickening of the wall with increasing aneurysm diameter.
    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...