A Willis-köri kollaterális kapacitás vizsgálatának klinikai jelentósége. Hogyan hasznosítható a mindennapi érsebészeti gyakorlatban egy matematikai alapú keringésélettani modell?

Translated title of the contribution: Clinical importance of assessment of collateral capacity in the circle of Willis. Benefit of a mathematical blood flow model for the every-day practice of vascular surgery

L. Orosz, Z. Kanyári, P. Siró, C. Molnár, E. Uray, B. Fülesdi

Research output: Contribution to journalArticle

Abstract

Collateral capacity of the Willisian arteries is of clinical importance during and after carotid endarterectomies. AIMS: Assessment of cerebral hemodynamics using a flow circulation model based on a mathematical formula. PATIENTS AND METHODS: Four patients suffering from ischemic stroke in moribund stage were investigated using transcranial color-coded duplex sonography. By compressing the common carotid arteries, the function of the Willisian collaterals was assessed. After the death of the patients, the circles were removed, the diameters and lengths of the arterial segments were measured. The data were analysed with the mentioned circulation model. RESULTS: The diameters of non-functioning collateral arteries were 0.4 mm, while that of the functional ones were 0.7 and 0.8 mm, respectively. In the two cases where the anterior communicating arteries did not function, a near-critical hemodynamical status was found in the end-arteries. This was especially true if the mean arterial blood pressure was 70 mmHg. The most critical hemodynamical status developed in case 4, where internal carotid occlusion on one side, a contralateral severe carotid stenosis and a non-functioning anterior communicating artery were observed. CONCLUSIONS: A special flow circulation model based on mathematical formula enables the calculation of the cerebral blood flow in the different arterial segments of the circle of Willis. Further studies are needed to clarify whether the method can be used for preoperative modeling of the cross-clamping phase of carotid endarterectomy.

Original languageHungarian
Pages (from-to)110-114
Number of pages5
JournalMagyar sebészet
Volume54
Issue number2
Publication statusPublished - 2001

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Circle of Willis
Blood Vessels
Arteries
Carotid Endarterectomy
Cerebrovascular Circulation
Arterial Pressure
Carotid Stenosis
Common Carotid Artery
Constriction
Ultrasonography
Color
Hemodynamics
Stroke

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A Willis-köri kollaterális kapacitás vizsgálatának klinikai jelentósége. Hogyan hasznosítható a mindennapi érsebészeti gyakorlatban egy matematikai alapú keringésélettani modell? / Orosz, L.; Kanyári, Z.; Siró, P.; Molnár, C.; Uray, E.; Fülesdi, B.

In: Magyar sebészet, Vol. 54, No. 2, 2001, p. 110-114.

Research output: Contribution to journalArticle

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title = "A Willis-k{\"o}ri kollater{\'a}lis kapacit{\'a}s vizsg{\'a}lat{\'a}nak klinikai jelent{\'o}s{\'e}ge. Hogyan hasznos{\'i}that{\'o} a mindennapi {\'e}rseb{\'e}szeti gyakorlatban egy matematikai alap{\'u} kering{\'e}s{\'e}lettani modell?",
abstract = "Collateral capacity of the Willisian arteries is of clinical importance during and after carotid endarterectomies. AIMS: Assessment of cerebral hemodynamics using a flow circulation model based on a mathematical formula. PATIENTS AND METHODS: Four patients suffering from ischemic stroke in moribund stage were investigated using transcranial color-coded duplex sonography. By compressing the common carotid arteries, the function of the Willisian collaterals was assessed. After the death of the patients, the circles were removed, the diameters and lengths of the arterial segments were measured. The data were analysed with the mentioned circulation model. RESULTS: The diameters of non-functioning collateral arteries were 0.4 mm, while that of the functional ones were 0.7 and 0.8 mm, respectively. In the two cases where the anterior communicating arteries did not function, a near-critical hemodynamical status was found in the end-arteries. This was especially true if the mean arterial blood pressure was 70 mmHg. The most critical hemodynamical status developed in case 4, where internal carotid occlusion on one side, a contralateral severe carotid stenosis and a non-functioning anterior communicating artery were observed. CONCLUSIONS: A special flow circulation model based on mathematical formula enables the calculation of the cerebral blood flow in the different arterial segments of the circle of Willis. Further studies are needed to clarify whether the method can be used for preoperative modeling of the cross-clamping phase of carotid endarterectomy.",
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