Numerical simulation flow dynamics of an intracranial aneurysm

2021 ◽  
pp. 1-7
Author(s):  
Yang Zhang ◽  
Junjie Fan ◽  
Yunxia Xiu ◽  
Luyao Zhang ◽  
Guangxin Chen ◽  
...  

BACKGROUND: Computational fluid dynamics provides a new method for the study of the blood flow characteristics of the formation and development of intracranial aneurysms. OBJECTIVE: To compare blood flow characteristics between the healthy internal carotid artery and normal intracranial aneurysms. METHODS: The internal carotid arteries were simulated to obtain hemodynamic parameters in one patient. RESULTS: The internal carotid artery associated with aneurysm presents low wall shear stress, high oscillatory shear index, and high particle retention time compared with the normal internal carotid artery. CONCLUSIONS: There are differences in blood flow between the normal internal carotid artery and intracranial aneurysm. The vortex of the aneurysm will produce turbulence, indicating that it is unstable, which results in the growth and rupture of the aneurysm.

2009 ◽  
Vol 123 (12) ◽  
pp. 1331-1337 ◽  
Author(s):  
H G Hatipoglu ◽  
M A Cetin ◽  
A Selvi ◽  
E Yuksel

AbstractObjective:This study aimed to determine whether magnetic resonance imaging has a role in the evaluation of the sphenoid sinus and internal carotid artery. In addition, we aimed to establish reference measurements for the minimal distance between the internal carotid arteries.Method:The sphenoid sinuses and neighbouring internal carotid arteries of 90 patients were evaluated using sagittal T1-weighted and axial and coronal T2-weighted magnetic resonance images.Results:Sphenoid sinus pneumatisation was categorised as occipitosphenoidal (0 per cent), conchal (3.3 per cent), presellar (14.4 per cent) or sellar (82.2 per cent). The internal carotid artery protruded into the sphenoid sinus in 32.8 per cent, with a septum in 9.4 per cent. The incidence of sellar-type sphenoid sinus pneumatisation was higher in patients with protrusion of the internal carotid artery into the sphenoid sinus (p < 0.001). The incidence of presellar pneumatisation was higher in patients without internal carotid artery protrusion (p < 0.001). The minimal distance between the internal carotid arteries varied between 9.04 and 24.26 mm (mean, 15.94 mm).Conclusion:Magnetic resonance imaging can provide useful information about the sphenoid sinus and internal carotid artery, prior to endoscopic sphenoidotomy and trans-sphenoidal hypophysectomy.


1979 ◽  
Vol 50 (6) ◽  
pp. 747-757 ◽  
Author(s):  
Roger W. Countee ◽  
Thurairasah Vijayanathan

✓ The authors describe their experiences with five patients with delayed transient ischemic symptoms homolateral to internal carotid artery (ICA) occlusions. In each instance, initial arteriograms were interpreted as showing irreversible occlusions of these arteries in the neck and microvascular bypass procedures were contemplated. However, after repeat arteriographic evaluations with a modified injection technique, certain angiographic features were identified that suggested the mechanism of the symptoms in these patients and that their ICA's could be reconstituted in the neck. This was successfully accomplished in each patient with complete relief of ischemic symptoms. The angiographic technique employed and the arterial flow patterns identified in these patients are discussed. The details of the operative technique are described. It is concluded that routine arteriographic techniques may be inadequate to identify the reversible carotid occlusion. This may account for some of the confusion which surrounds the surgery of these vessels as well as the failure of extracranial-intracranial bypass to relieve recurrent ischemic symptoms in these individuals.


2005 ◽  
Vol 3 (1) ◽  
pp. 0-0
Author(s):  
Egidijus Barkauskas ◽  
Povilas Pauliukas ◽  
Kęstutis Laurikėnas ◽  
Gytis Šustickas

Egidijus Barkauskas, Povilas Pauliukas, Kęstutis Laurikėnas, Gytis ŠustickasVšĮ Vilniaus greitosios pagalbos universitetinė ligoninė,Šiltnamių g. 29, LT-04130 VilniusEl paštas: [email protected] Įvadas Straipsnyje aprašomos palyginti retų arterijos didelių ir gigantiškų vidinės miego aneurizmų atsiradimo priežastys. Skirtingai nuo kitų straipsnių, čia kartu apžvelgiamos vidinės miego arterijos ekstrakranijinės ir intrakranijinės dalių aneurizmos. Aprašomos įvairios aneurizmų diagnostikos ir gydymo perrišant kaklo vidinę miego arteriją galimybės. Šio straipsnio tikslas – apžvelgti ir įvertinti Vilniaus neuroangiochirurgijos centre atliktų vidinės miego arterijos gigantiškų aneurizmų operacijų rezultatus, parodyti šių operacijų efektyvumą ir jų atlikimo metodus. Ligoniai ir metodai Straipsnyje nagrinėjami 12 ligonių, kuriems buvo vidinės miego arterijos aneurizmos, tyrimo ir gydymo duomenys. Ligonių amžius svyravo nuo 42 iki 80 metų. Visi ligoniai operuoti. Operacijos atliktos per 35 metų laikotarpį. Keturi ligoniai operuoti nuo didelių ir gigantiškų intrakranijinių aneurizmų, septyni – nuo ekstrakranijinių vidinės miego arterijos ir vienas – išorinės miego arterijos aneurizmų. Didelėmis vadinome tokias aneurizmas, kai intrakranijinių aneurizmų vidinis skersmuo didesnis negu 3 mm, o ekstrakranijinių – 3–4 ir daugiau kartų viršijo normalų tos pačios arterijos spindį. Aptariami įvairūs chirurginio gydymo metodai, daugiausia dėmesio kreipiant į aneurizmos užtrombavimo arba rezekcijos būdus ir smegenų kraujotakos atkūrimo sąlygas. Rezultatai Mūsų klinikoje iš 12 ligonių, operuotų nuo vidinės miego arterijos aneurizmos, nė vienas nemirė, naujų insultų neįvyko, ir tik 2 ligoniams iš keturių po intrakranijinių aneurizmų užtrombavimo liko neženkli hemiparezė, kuri vienai ligonei buvo nustatyta atvykus į ligoninę, o kitai hemiparezė pasireiškė dar prieš operaciją, po nepavykusio aneurizmos užkimšimo balionu. Prieš operaciją 3 ligonius varginę stiprūs galvos skausmai, plintantys į akiduobę, išnyko. Visi 12 ligonių išrašyti į namus. Išvados Pasitelkiant šiuolaikinę diagnostinę aparatūrą daugumą intrakranijinių ir ekstrakranijinių vidinės miego arterijos aneurizmų galima diagnozuoti prieš joms plyštant. Aneurizmų gydymui gali būti naudojami įvairūs metodai. Nepavykus tiesiogiai atkurti kraujotakos ir esant blogai smegenų kolateralinei apytakai galima taikyti vieną iš alternatyvių gydymo metodų, kai vidinė miego arterija perrišama, aneurizma užtrombuojama, atliekama ekstraintrakranijinio nuosruvio operacija. Mums prieinamomis operacijų metodikomis gauname gerus aneurizmų gydymo rezultatus. Reikšminiai žodžiai: vidinė miego arterija, aneurizma, vidinės miego arterijos perrišimas, ekstraintrakranijinio nuosruvio operacija Results of treatment of internal carotid artery aneurysms Egidijus Barkauskas, Povilas Pauliukas, Kęstutis Laurikėnas, Gytis ŠustickasVilnius University Emergency Hospital,Šiltnamių str. 29, LT-04130 Vilnius, LithuaniaE-mail: [email protected] Background/objective The causes of development of big and giant aneurysms of internal carotid artery are described in this paper. Differently from other papers, the intracranial and extracranial aneurysms are analyzed together in this article. Various diagnostic and treatment procedures, including ligation of internal carotid artery in the neck, are described. The main purpose of this paper is to describe and evaluate the results of operations of giant aneurysms of the internal carotid artery performed at Vilnius Neurovascular Surgery Center as well as to show the effectiveness of these operations and the methods of performing these procedures. Patients and methods Twelve patients were investigated and operated on for internal carotid artery aneurysm during a 35-year period. The age of patients was between 42 and 80 years. Four patients were operated on for big and giant intracranial aneurysms, 7 for extracranial internal carotid artery aneurysms and 1 for external carotid artery aneurysm. As big aneurysms were interpreted intracranial aneurysms with the internal diameter exceeding 3 mm and extracranial aneurysms exceeding in diameter the normal lumen of the internal carotid artery 3–4 times or more. Different methods of surgical treatment are analyzed; special attention is paid to exclusion and resection of the aneurysm as well as to the restoration of blood flow to the brain. Results Twelve patients were operated on in our center for aneurysm of the internal carotid artery. There were no deaths and strokes. Two patients had light hemiparesis after the induced thrombosis of the intracranial aneurysm. Both of them had it prior to the operation; one of them after the attempted unsuccessful balloon occlusion of the aneurysm. Three patients have had severe headache irradiating into the orbit before treatment. After the operation the headache disappeared. All patients were discharged from the hospital. Conclusions The modern diagnostic equipment allows to diagnose most of the intracranial and ectracranial internal carotid artery aneurysms before they rupture. Different methods can be applied for the treatment of these aneurysms. The extra-intracranial shunting procedure can be used as an alternative revascularization method in cases when direct blood flow to the brain cannot be restored and collateral brain blood flow is insufficient. Good results of surgical treatment of internal carotid artery aneurysms were achieved using the techniques described in this article. Keywords: internal carotid artery aneurysm, ligation of the internal carotid artery, extra-intracranial shunting operation


2010 ◽  
Vol 124 (9) ◽  
pp. 1033-1036 ◽  
Author(s):  
S Hosokawa ◽  
H Mineta

AbstractBackground:Deformities of the carotid artery are rare. Tortuosity, kinking and coiling of the internal carotid artery may be observed with advancing age. A tortuous internal carotid artery may cause an abnormal sensation in the throat. In the early twentieth century, there were several reported cases of fatal haemorrhage during pharyngeal surgical procedures, because this condition went undetected.Method and results:We present two cases of tortuosity of the right internal carotid artery. Both women complained of abnormal throat sensations. Endoscopic studies and radiological examinations revealed tortuous right internal carotid arteries presenting as pulsatile masses. A literature review revealed that, in most reported cases, this deformity occurred on the right side. We believe that the defect and its right-sided predominance can be attributed to anatomical influences and factors affecting blood pressure.Conclusion:In most reported cases of tortuous internal carotid artery, the defect occurred on the right side and patients complained of an abnormal sensation in the throat. This information is useful in the diagnosis of this condition. It is important for otolaryngologists to recognise this anomaly, because fatal haemorrhage can occur in patients with this condition during surgical procedures on the pharynx.


2011 ◽  
Vol 17 (1) ◽  
pp. 22-26
Author(s):  
H.-C. Chen ◽  
C.-J. Lin ◽  
F.-C. Chang ◽  
C.-B. Luo ◽  
Y.-J. Lai ◽  
...  

Collateral networks between the external carotid artery and internal carotid arteries become crucial for cerebral perfusion after occlusion of internal carotid arteries. We report the first case of a patient who received percutaneous transluminal angioplasty and stenting in a collateral vessel between the external and internal carotid artery for treatment of radiation induced severe stenosis of the internal carotid artery in the context of a contralateral internal carotid artery occlusion.


2013 ◽  
Vol 2013 ◽  
pp. 1-4
Author(s):  
Gary G. Tse ◽  
Elna M. Masuda ◽  
Aaron M. McMurtray ◽  
Beau K. Nakamoto

The risk of stroke and management of coiling of the cervical internal carotid artery in the absence of an atherosclerotic carotid bulb lesion is unclear. We report a case of an otherwise healthy 39-year-old woman who developed bilateral sequential strokes associated with bilateral coiled internal carotid arteries. We discuss the risk of stroke and management of coiled carotid arteries as they relate to the patient presented.


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