Cerebral saturation reflects anterior cerebral artery flow parameters by Doppler ultrasound in the extremely premature newborn

2021 ◽  
Author(s):  
Gabriel Altit ◽  
Shazia Bhombal ◽  
Valerie Y. Chock
Keyword(s):  
Doppler Ultrasound ◽  
Cerebral Artery ◽  
Anterior Cerebral Artery ◽  
Premature Newborn ◽  
Flow Parameters ◽  
Cerebral Saturation ◽  
Artery Flow

scholarly journals Hemodynamic Effect of Unequal Anterior Cerebral Artery Flow Rates on the Anterior Communicating Artery Bifurcation: A Computational Fluid Dynamics Study

2008 ◽  
Vol 2008 ◽  
pp. 1-9 ◽  
Author(s):  
Thomas Rau ◽  
Xing He ◽  
Prem Venugopal ◽  
Fernando Viñuela ◽  
Gary Duckwiler ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Cerebral Artery ◽  
Anterior Cerebral Artery ◽  
Hemodynamic Effect ◽  
Anterior Communicating Artery ◽  
Parent Artery ◽  
Symmetric Model ◽  
Flow Rates ◽  
Artery Flow

Computational fluid dynamics techniques were used to investigate the hemodynamic effect of unequal anterior cerebral artery flow rates on the anterior cerebral and anterior communicating artery (ACA-ACOM) bifurcation. Hemodynamics have long been implicated as a major factor in cerebrovascular disease. Using an idealized 2D symmetric model of the ACA-ACOM geometry, the flow field and wall shear stress (WSS) at the bifurcation regions are assessed for pulsatile inflows with left to right flow ratios of 1:1, 2:1, 3:1, and 4:1. Unequal flow rates through the ACA parent arteries result in bifurcation of the higher flow parent stream and a shifting of the impingement points along the A2-ACOM adjoining wall toward the contralateral ACA. Cross-flow through the ACOM is generally unstable and results in increased WSS at the impingement region from the higher flow parent artery and a double amplitude peak in the WSS at the contralateral bifurcation region from local recirculation effects. These results suggest that asymmetry in ACA flow rates result in increased hemodynamic stresses at the ACA-ACOM bifurcation regions and suggest a possible factor for vessel weakening and aneurysm formation.

Intraoperative evaluation of cerebral hemodynamics using directional Doppler technique

1979 ◽  
Vol 50 (5) ◽  
pp. 570-577 ◽  
Author(s):  
Helge Nornes ◽  
Arne Grip ◽  
Per Wikeby
Keyword(s):  
Flow Velocity ◽  
Cerebral Artery ◽  
Anterior Cerebral Artery ◽  
Parent Artery ◽  
Collateral Flow ◽  
Probe Position ◽  
Content Type ◽  
Doppler Technique ◽  
Proximal Anterior Cerebral Artery ◽  
Artery Flow

✓ The use of a pulsed echo Doppler technique during procedures for occlusion of intracranial aneurysms is described. Saccular aneurysms can be located with reference to probe position and depth setting. Tracings of intra-aneurysmal flow are presented, and the characteristic flow pattern is discussed. Special emphasis has been placed on the parent artery flow, particularly the effect of lumen reduction on flow velocity. Results of flow velocity studies on the cognate (direct) and collateral flow in the middle cerebral artery and the proximal anterior cerebral artery are presented and discussed.

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