1,887 Hits in 7.2 sec

The Numerical Study of the Hemodynamic Characteristics in the Patient-Specific Intracranial Aneurysms before and after Surgery

Jun Soo Byun, Sun-Young Choi, Taewon Seo
2016 Computational and Mathematical Methods in Medicine  
Three-dimensional computational fluid dynamics models were used to investigate the hemodynamic phenomena in the cerebral arteries before and after surgery of the aneurysm under realistic conditions.  ...  The patient-specific pre- and postsurgery cerebral arterial geometries in the study were reconstructed from computed tomography angiography (CTA).  ...  Conclusions The purpose of this study was to investigate the hemodynamic characteristics in the cerebral arteries before and after surgery of the aneurysms under realistic flow conditions.  ... 
doi:10.1155/2016/4384508 pmid:27274764 pmcid:PMC4871964 fatcat:ekhqqa5xybgsddanlvn7pjwr6e

Hemodynamics in Ruptured Intracranial Aneurysms [chapter]

Hejčl Aleš, Stratilová Mária, Švihlová Helena, Alena Sejkorová, Radovnický Tomáš, Hron Jaroslav, Feletti Alberto, Koblížek Miroslav, Zámečník Josef, Beneš Vladimír, Dragomir-Daescu Dan, Sameš Martin
2019 Intracranial Aneurysms [Working Title]  
Hemodynamics in cerebral blood vessels plays a key role in the lifetime cycle of intracranial aneurysms (IA).  ...  Detailed CFD analysis of the rupture point can further strengthen the association between hemodynamics and rupture. In this chapter we summarize current knowledge on CFD and intracranial aneurysms.  ...  All rights reserved. 13 Hemodynamics in Ruptured Intracranial Aneurysms DOI:  ... 
doi:10.5772/intechopen.88695 fatcat:dowza5ssfvgulguzr4x6e5dgd4

Low wall shear stress is associated with the rupture of intracranial aneurysm with known rupture point: case report and literature review

Yisen Zhang, Linkai Jing, Ying Zhang, Jian Liu, Xinjian Yang
2016 BMC Neurology  
In the present study, we studied the hemodynamic characteristics of a posterior communicating artery segment aneurysm that ruptured during angiography and detailed the hemodynamic features at the rupture  ...  Few previous hemodynamic studies demonstrated the detailed features of rupture point of intracranial aneurysms. The hemodynamic simulation for the case that ruptured during angiography was even rare.  ...  Availability of data and materials The dataset supporting the conclusions of this article is included within the article.  ... 
doi:10.1186/s12883-016-0759-0 pmid:27863464 pmcid:PMC5116170 fatcat:iss6x5egwzbjbh64xa4fq22snu

Cerebrovascular systems with concomitant pathologies:A computational hemodynamics study

Marcelo A Castro, Nora L Peloc, Juan R Cebral
2013 Journal of Physics, Conference Series  
The aim of this study is to investigate the intraaneurysmal hemodynamic changes before and after treatment of stenotic plaque.  ...  Case reports showed patients who died due to aneurysm rupture months after endarterectomy but before aneurysm clipping, while others did not show any change in the aneurysm after plaque removal, having  ...  In this work we analyze the hemodynamic characteristics at cerebral aneurysms before and after the virtual removal of a proximal stenotic plaque.  ... 
doi:10.1088/1742-6596/477/1/012003 fatcat:tkbawxk4lnco5ihhtl2kkm6dbu

Hemodynamic analysis and implantation strategies of delayed intracranial aneurysm rupture after flow diverter treatment

Shiyao Chen, Bin Bai, Nan Lv, Yunzhang Cheng, Bin Ji
2021 Annals of Translational Medicine  
In this study, we investigated not only the hemodynamic factors involved in postoperative rupture, but also the hemodynamic effects of different FDs implantation strategies on avoiding this complication  ...  After FDs implantation, the velocity of blood entering the aneurysm decreased (Case 1, 25.4%; Case 2, 30.6%), but the inflow jet impingement still existed in Case 1.  ...  of China Youth Project (81701775) and the Top-level Clinical Discipline Project of Shanghai Pudong (PWYgf2021-07).  ... 
doi:10.21037/atm-21-5939 pmid:35071429 pmcid:PMC8743709 fatcat:que54336xbgkjcks5nx6dtbm7q

Influence of morphology and hemodynamic factors on rupture of multiple intracranial aneurysms: matched-pairs of ruptured-unruptured aneurysms located unilaterally on the anterior circulation

Ying Zhang, Xinjian Yang, Yang Wang, Jian Liu, Chuanhui Li, Linkai Jing, Shengzhang Wang, Haiyun Li
2014 BMC Neurology  
Patient-specific models based on their 3D-DSA images were constructed and analyzed. The relative locations, morphologic and hemodynamic factors of these two groups were compared.  ...  The authors evaluated the impact of morphological and hemodynamic factors on the rupture of matched-pairs of ruptured-unruptured intracranial aneurysms on one patient's ipsilateral anterior circulation  ...  ) [10] , while using generalized (typical flow rates in a healthy adult) and patient-specific inflow boundary conditions may results in different WSS magnitudes and hemodynamic characteristics [34] .  ... 
doi:10.1186/s12883-014-0253-5 pmid:25551809 pmcid:PMC4301794 fatcat:z3xepug7brfdfhzjmslpqsnzwq

Computational Hemodynamic Analysis for the Diagnosis of Atherosclerotic Changes in Intracranial Aneurysms: A Proof-of-Concept Study Using 3 Cases Harboring Atherosclerotic and Nonatherosclerotic Aneurysms Simultaneously

Shin-ichiro Sugiyama, Hidenori Endo, Kuniyasu Niizuma, Toshiki Endo, Kenichi Funamoto, Makoto Ohta, Teiji Tominaga
2016 Computational and Mathematical Methods in Medicine  
This proof-of-concept study demonstrated that CFD analysis provided detailed information on the exchange and residence of blood that is useful for the diagnosis of atherosclerotic changes in intracranial  ...  This was a proof-of-concept computational fluid dynamics (CFD) study designed to identify atherosclerotic changes in intracranial aneurysms.  ...  Shin-ichiro Sugiyama, Kuniyasu Niizuma, and Teiji Tominaga acknowledge the support of grants from the Japanese Ministry of Education, Culture, Sports, and Technology (no. 15559290).  ... 
doi:10.1155/2016/2386031 pmid:27703491 pmcid:PMC5040129 fatcat:j57bes4uprayzojjyube2fmtti

Computed Tomography Image under Optimized Iterative Reconstruction Algorithm to Analyze the Characteristics of Blood Flow Field in Cerebral Aneurysm before and after Stent Implantation

Kunyang Bao, Chao Liu, Jin Li, Xiang Liu, Wenzhang Luo, Changren Huang, Gustavo Ramirez
2021 Scientific Programming  
In order to analyze the change characteristics of blood flow field in cerebral aneurysms before and after stent implantation, this study first constructed an optimized iterative reconstruction algorithm  ...  Before operation, the blood flow velocity in the neck of aneurysm was 7.35 × 10−2 m/s, the exit velocity was 1.51 × 10−1 m/s, and the maximum velocity appeared in the upstream part of the exit.  ...  Acknowledgments is work was supported by Scientific Research Project of the Health Commission of Sichuan Province (no. 19PJ296).  ... 
doi:10.1155/2021/7915729 fatcat:mdlas4snfnbqdikvlrw6fwmltu

Hemodynamic Analysis of Pipeline Embolization Device Stent for Treatment of Giant Intracranial Aneurysm under Unsupervised Learning Algorithm

Haibin Gao, Wei You, Jian Lv, Youxiang Li, Le Sun
2022 Journal of Healthcare Engineering  
In summary, based on the unsupervised learning algorithm, the PED stent had a good adoption effect in the treatment of intracranial aneurysms and was suitable for subsequent treatment.  ...  Unsupervised learning model algorithm was used to screen aneurysm health big data, find aneurysm blood flow and PED stent positioning characteristic parameters, and guide PED stent treatment of intracranial  ...  In this study, 100 patients with intracranial aneurysms met the above inclusion criteria and exclusion criteria. is study had been approved by the Medical Ethics Committee of the hospital, and the families  ... 
doi:10.1155/2022/8509195 pmid:35028125 pmcid:PMC8752217 fatcat:iqwggwleczhfbg3n72lnz2awdm

Rupture Risk of Intracranial Aneurysm and Prediction of Hemorrhagic Stroke after Liver Transplant

Hye-Mee Kwon, In-Gu Jun, Kyoung-Sun Kim, Young-Jin Moon, In Young Huh, Jungmin Lee, Jun-Gol Song, Gyu-Sam Hwang
2021 Brain Sciences  
The prevalence of UIAs was 4.63% (n = 164; 95% confidence interval (CI), 3.95–5.39%). The 1-year SAH incidence was 0.68% (95% CI, 0.02–3.79%) in patients with UIA.  ...  SAH and HS incidence and mortality were not different between those with and without UIA before and after PSM.  ...  Acknowledgments: We would like to thank Hwa Jung Kim from the Department of Clinical Epidemiology and Biostatistics, Asan Medical Center, University of Ulsan College of Medicine, for assisting in statistical  ... 
doi:10.3390/brainsci11040445 pmid:33807191 fatcat:w25nechsxjd25mb4wt5j52th4u

Anterior Communicating Artery Aneurysms: Anatomical Considerations and Microsurgical Strategies

Junhui Chen, Mingchang Li, Xun Zhu, Yan Chen, Chunlei Zhang, Wenwen Shi, Qianxue Chen, Yuhai Wang
2020 Frontiers in Neurology  
Anterior communicating artery aneurysms account for 23-40% of ruptured intracranial aneurysms and 12-15% of unruptured aneurysms and are the most common intracranial ruptured or unruptured aneurysms.  ...  Clarifying the anatomy before surgery is helpful for better selecting the surgical approach and surgical side, which could affect the intraoperative exposure of the aneurysm and adjacent arteries, the  ...  ACKNOWLEDGMENTS We would like to thank all the participants in the study.  ... 
doi:10.3389/fneur.2020.01020 pmid:33013671 pmcid:PMC7509403 fatcat:smm236ynsvb4jf5k756ovpwf5q

Detection of Hemodynamic Characteristics Before Growth in Growing Cerebral Aneurysms by Analyzing Time-of-Flight Magnetic Resonance Angiography Images Alone: Preliminary Results

Hidehito Kimura, Kosuke Hayashi, Masaaki Taniguchi, Kohkichi Hosoda, Atsushi Fujita, Takeshi Seta, Akio Tomiyama, Eiji Kohmura
2019 World Neurosurgery  
Aneurysm Growth Occurs at Region of Low Wall 11 Shear Stress Patient-Specific Correlation of Hemodynamics and Growth in a Longitudinal 12 Study. doi:10.1161/STROKEAHA.108.521617. 13 10.  ...  Hemodynamics in a cerebral 7 artery before and after the formation of an aneurysm. AJNR Am J Neuroradiol. 8 2006;27(5):1113-1118.  ... 
doi:10.1016/j.wneu.2018.11.081 pmid:30465954 fatcat:2r4f6utupnasnhwtu65emjn64y

Unruptured Intracranial Aneurysms: Current Perspectives on the Origin and Natural Course, and Quest for Standards in the Management Strategy

Akio MORITA, Toshikazu KIMURA, Masaaki SHOJIMA, Tetsuro SAMESHIMA, Tetsuhiro NISHIHARA
2010 Neurologia medico-chirurgica  
Management of unruptured intracranial aneurysms requires knowledge of the natural course and management risks of individual aneurysms.  ...  In 133 consecutive surgeries, two patients (1.5%) suffered severe neurological morbidity.  ...  Characteristics of Unruptured Intracranial Aneurysms I. Origin and rupture The origin and cause of rupture of cerebral aneurysms remain unclear.  ... 
doi:10.2176/nmc.50.777 pmid:20885112 fatcat:p7vxbcxffnb5vjd5jlaollobhm

Mean Arterial Pressure Required for Maintaining Patency of Extracranial-to-Intracranial Bypass Grafts

Sheau Fung Sia, Yi Qian, Yu Zhang, Michael Kerin Morgan
2012 Neurosurgery  
DISCUSSION CFD technology as a tool for studying patient-specific hemodynamic characteristics has increased in popularity.  ...  In our study, we set out to investigate the minimum MAP for EC-IC bypass surgery with interposition of a saphenous graft by using patient-specific CFD models.  ... 
doi:10.1227/neu.0b013e318266e6c2 pmid:22791033 fatcat:sia6h47b7rc6ncibxdlmnf7ijy

Solitaire AB stent-assisted coiling embolization for the treatment of ruptured very small intracranial aneurysms

2015 Experimental and Therapeutic Medicine  
The aim of the present study was to evaluate the safety and efficacy of Solitaire AB stent-assisted coiling embolization for the treatment of ruptured very small intracranial aneurysms.  ...  Of the nice individuals, six patients exhibited complete occlusion at Raymond grade I and three patients exhibited occlusion at Raymond grade II. No aneurysm rupture was observed during the surgery.  ...  In the present study, no aneurysm-associated hemorrhage was observed in any of the nine patients, and of the three patients with Raymond grade II occlusion after the surgery, two patients reached Raymond  ... 
doi:10.3892/etm.2015.2826 pmid:26668623 pmcid:PMC4665850 fatcat:e4diwsdobvgh7lspnx5kzsoiom
« Previous Showing results 1 — 15 out of 1,887 results