Intermittent drop in blood flow velocity in the internal carotid artery and its branches

2002 ◽  
Vol 30 (2) ◽  
pp. 98-102
Author(s):  
Cirus Samii ◽  
Rolf R. Diehl ◽  
Peter Berlit
Keyword(s):  
Blood Flow ◽  
Carotid Artery ◽  
Internal Carotid Artery ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Internal Carotid

Comparison of blood flow velocity through the internal carotid artery based on Doppler ultrasound and numerical simulation

2012 ◽  
Vol 35 (4) ◽  
pp. 413-422 ◽  
Author(s):  
Hajar Hassani-Ardekani ◽  
Farzan Ghalichi ◽  
Hanieh Niroomand-Oscuii ◽  
Mehdi Farhoudi ◽  
Mohammad Kazem Tarzmani
Keyword(s):  
Numerical Simulation ◽  
Blood Flow ◽  
Carotid Artery ◽  
Internal Carotid Artery ◽  
Flow Velocity ◽  
Doppler Ultrasound ◽  
Blood Flow Velocity ◽  
Internal Carotid

Color Doppler Sonographic Evaluation of Collateral Circulation in Patients with Cerebral Aneurysms and the Occlusion of the Brachiocephalic Vessels

Neurosurgery ◽  
2005 ◽  
Vol 57 (6) ◽  
pp. 1117-1126 ◽  
Author(s):  
Wojciech Kaspera ◽  
Henryk Majchrzak ◽  
Piotr Ładziński ◽  
Witold Tomalski
Keyword(s):  
Blood Flow ◽  
Carotid Artery ◽  
Flow Velocity ◽  
Cerebral Aneurysm ◽  
Cerebral Artery ◽  
Blood Flow Velocity ◽  
Collateral Circulation ◽  
Internal Carotid ◽  
Cerebral Aneurysms ◽  
Control Group

Abstract OBJECTIVE: The objective of this study was to assess the collateral circulation and blood flow velocity in arteries forming collateral circulation in patients with cerebral aneurysms and the occlusion of the brachiocephalic vessels. METHODS: Between 1989 and 2004 we examined a group of seven consecutive patients with diagnosed cerebral aneurysm and occlusion of the extracranial artery by means of cerebral angiography, transcranial color-coded sonography (TCCS) and color Doppler sonography of extracranial arteries. The Doppler examination results achieved in this group were compared with the Doppler results of 40 healthy subjects from a control group. RESULTS: Three patients were diagnosed with an occluded innominate artery. In four other cases an occlusion of the extracranial segment of the internal carotid artery was found. The aneurysms were located on intracranial arteries of collateral flow. The innominate artery occlusion resulted in a hemodynamic effect which was a complete vertebral steal and systolic deceleration (in one case) or alternating flow (in two cases) in the right common carotid artery. An additional route of collateral circulation in all these cases led from extracranial carotid branches through the right external carotid artery to the ipsilateral internal carotid artery. In all seven patients, 13 intracranial collateral pathways were examined. In eight of them, including four cases with cerebral aneurysms, an increase in blood flow velocity was observed. In the remaining five cases, including three cases with cerebral aneurysms, the mean blood velocity was within the normal range. The anterior communicating artery (AComA) formed the main intracranial collateral pathway which was found in seven patients, including three patients with diagnosed AComA aneurysm. Blood flow velocity in ipsilateral (on the obstructed side) and contralateral (on the unobstructed side) anterior cerebral artery, as well as pulsatility and resistance indexes in contralateral anterior cerebral and middle cerebral arteries were higher compared with healthy control subjects. In the ipsilateral middle cerebral artery a relative, insignificant decrease of pulsatility and resistance indexes was detected. Ipsilateral and contralateral middle cerebral artery blood flow velocities were lower compared with the control group. CONCLUSION: Occlusion of the brachiocephalic vessels leads to formation of collateral circulation through the circle of Willis and the extracranial collaterals connecting the external and internal carotid arteries. An increase in blood flow velocity is commonly observed in intracranial arteries forming a collateral pathways. In some cases, not excluding arteries with a cerebral aneurysm, the increase in blood flow velocity is insignificant or none at all. This study shows that formation of a cerebral aneurysm is not always related to an increase in the flow velocity of collateral arteries.

scholarly journals Diameter and haemodynamics of internal carotid artery siphon and ophthalmic artery in patients with non-arteritic anterior ischaemic optic neuropathy

2019 ◽  
Author(s):  
Zhiyong Fu ◽  
Hongyang Li ◽  
Yanling Wang
Keyword(s):  
Blood Flow ◽  
Carotid Artery ◽  
Internal Carotid Artery ◽  
Blood Flow Velocity ◽  
Ophthalmic Artery ◽  
Internal Carotid ◽  
Flow Volume ◽  
Blood Flow Volume ◽  
Ischaemic Optic Neuropathy ◽  
Anterior Ischaemic Optic Neuropathy

Abstract Purpose To compare the diameter and the haemodynamics of internal carotid artery siphon(ICAS) and ophthalmic artery (OA) in patients with unilateral non-arteritic anterior ischaemic optic neuropathy (NAION) with their contralateral sides and age-matched controls. Methods 30 patients clinically diagnosed with NAION (unilateral affected) and 30 age-matched controls participated in this study. By CTA, the diameter of ICAS and OA in both eyes were measured. By CDI, the blood flow velocity (Vm) and the blood flow volume of ICAS and OA in both eyes were measured or calculated. Measurements on the affected side of the patients were compared to the contralateral healthy side and the controls. Results Compared between the affected sides and the controls, the Vm, the diameter, and the blood flow volume in the ICAS were all significantly decreased (p<0.05), the Vm and the blood flow volume in the OA tended to be reduced (p=0.062, 0.055 respectively), while the difference of the diameter in the OA was insignificant (p=0.116). Compared between the affected sides and the unaffected healthy sides, the Vm, the diameter, and the blood flow volume in the ICAS were also significantly decreased (p<0.05), while no marked differences were detected in the OA, neither for the Vm, the diameter, or the blood flow volume(p=0.178, 0.151,0.173 respectively). Conclusion NAION may be associated with decreased blood flow velocity and diameter in the ICAS . These findings might be potentially useful in the monitoring of NAION.

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