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cerebral angiography

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https://www.readbyqxmd.com/read/29235088/middle-cerebral-artery-anatomical-variations-and-aneurysms-retrospective-study-based-on-computed-tomography-angiography-findings
#1
Paweł Brzegowy, Jakub Polak, Jakub Wnuk, Bartłomiej Łasocha, Jerzy Walocha, Tadeusz J Popiela
BACKGROUND: Anatomical variations of the middle cerebral artery (MCA) are an important clinical issue, due to high prevalence of intracranial aneurysms. Anatomical variations of vessels can lead to higher shear stress, which is thought to be the main factor leading to aneurysm formation and consequently to higher prevalence of aneurysms. The aim of this study was to evaluate anatomy of the MCA; to classify MCA aneurysms using CT angiography and to correlate anatomical variations of MCA and circle of Willis with prevalence of MCA aneurysms...
December 13, 2017: Folia Morphologica (Warsz)
https://www.readbyqxmd.com/read/29231794/intracranial-contrast-transit-times-on-digital-subtraction-angiography-decrease-more-in-patients-with-delayed-intraparenchymal-hemorrhage-after-pipeline
#2
Denise Brunozzi, Sophia F Shakur, Fady T Charbel, Ali Alaraj
Background Pipeline embolization devices (PEDs) are used for endovascular treatment of cerebral aneurysms but can be associated with delayed ipsilateral intraparenchymal hemorrhage (DIPH). Changes in intracranial hemodynamics after PED are poorly understood. Objective Here, we assess hemodynamic changes after PED in patients and compare these changes in patients with and without DIPH (DIPH+ and DIPH-). Methods Records of patients with distal internal carotid artery (ICA) aneurysms treated with PED at our institution between 2012 and 2017 were retrospectively reviewed...
January 1, 2017: Interventional Neuroradiology
https://www.readbyqxmd.com/read/29220356/color-doppler-ultrasonography-as-an-alternative-tool-for-postoperative-evaluation-of-collaterals-after-indirect-revascularization-surgery-in-moyamoya-disease
#3
Shin-Joe Yeh, Sung-Chun Tang, Li-Kai Tsai, Chung-Wei Lee, Ya-Fang Chen, Hon-Man Liu, Shih-Hung Yang, Meng-Fai Kuo, Jiann-Shing Jeng
The cerebral hypoperfusion caused by chronic progressive stenosis or occlusion of intracranial arteries in moyamoya disease can be treated by direct bypass or indirect revascularization procedures. The extent of collaterals from the external carotid artery (ECA) after indirect revascularization surgery is the key point of angiographic follow-up, and the invasiveness of angiography impelled us to investigate the role of ultrasonography in the evaluation of collaterals. We hypothesized that the collaterals shown on angiography might produce corresponding hemodynamic changes in color Doppler ultrasonography...
2017: PloS One
https://www.readbyqxmd.com/read/29218385/bilateral-carotid-anterior-cerebral-artery-anastomoses-associated-with-bilateral-ophthalmic-arteries-arising-from-the-anastomotic-arteries-diagnosed-by-magnetic-resonance-angiography-a-case-report
#4
Akira Uchino, Naoko Saito, Norio Tanahashi
Rarely, the anterior cerebral artery (ACA) arises from the ophthalmic segment of the internal carotid artery, a condition described as carotid-ACA anastomosis or infraoptic course of the ACA that generally demonstrates right-sided predominance. We diagnosed a case of bilateral anastomoses of the carotid and ACA vessels in which bilateral ophthalmic arteries arose from the origins of the anastomotic vessels using magnetic resonance (MR) angiography. Identification of rare arterial variations on MR angiography requires careful scrutiny of source images, and creation of partial volume-rendering images can aid visualization of detailed anatomic structures...
December 7, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/29215168/decreased-signal-intensity-ratio-on-mra-reflects-misery-perfusion-on-spect-in-patients-with-intracranial-stenosis
#5
Masatomo Miura, Makoto Nakajima, Akiko Fujimoto, Shinya Shiraishi, David S Liebeskind, Yukio Ando
BACKGROUND AND PURPOSE: Acetazolamide reactivity on 123 I-IMP SPECT is used to detect misery perfusion due to intracranial atherosclerosis. Noninvasive fractional flow assessed by signal intensity ratio (SIR) on time of flight-magnetic resonance angiography (TOF-MRA) might offer a feasible alternative to identify high-risk intracranial stenosis. METHODS: Data from consecutive patients with unilateral middle cerebral artery (MCA) stenosis who underwent both TOF-MRA and acetazolamide reactivity on 123 I-IMP SPECT were retrospectively analyzed...
December 7, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29214780/mismatch-between-tof-mr-angiography-and-ct-angiography-of-the-middle-cerebral-artery-may-be-a-critical-sign-in-cerebrovascular-dynamics
#6
Keiji Igase, Michiya Igase, Ichiro Matsubara, Kazuhiko Sadamoto
PURPOSE: Although time-of-flight (TOF)-magnetic resonance angiography (MRA) can clearly depict intracranial arteries, the arterial flow of middle cerebral artery (MCA) is occasionally not detected. We evaluated this phenomenon with reference to cerebrovascular dynamics. MATERIALS AND METHODS: Seventeen patients with suspected occlusion of MCA or internal carotid artery on TOF-MRA were enrolled. All patients underwent CT angiography (CTA) and quantitative cerebral blood flow (CBF) examination for measurement of resting CBF and cerebrovascular reactivity (CVR)...
January 2018: Yonsei Medical Journal
https://www.readbyqxmd.com/read/29214402/decision-making-and-neurosurgeons-agreement-in-the-management-of-aneurysmal-subarachnoid-haemorrhage-based-on-computed-tomography-angiography
#7
Nicolai Maldaner, Jan-Karl Burkhardt, Martin Nikolaus Stienen, Johannes Goldberg, David Bervini, Philippe Bijlenga, Davide Croci, Daniel Zumofen, Donato D'Alonzo, Serge Marbacher, Rodolfo Maduri, Roy Thomas Daniel, Carlo Serra, Giuseppe Esposito, Marian C Neidert, Oliver Bozinov, Luca Regli
BACKGROUND: To determine the neurosurgeon's agreement in aneurysmal subarachnoid haemorrhage (aSAH) management with special emphasis on the rater's level of experience. A secondary aim was to analyse potential aneurysm variables associated with the therapeutic recommendation. METHOD: Basic clinical information and admission computed tomography angiography (CTA) images of 30 consecutive aSAH patients were provided. Twelve neurosurgeons independently evaluated aneurysm characteristics and gave recommendations regarding the emergency management and aneurysm occlusion therapy...
December 7, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/29210221/heart-rate-sensitive-optical-coherence-angiography-for-measuring-vascular-changes-due-to-posttraumatic-brain-injury-in-mice
#8
Jordi L Tremoleda, Karl Alvarez, Abdirahman Aden, Robert Donnan, Adina T Michael-Titus, Peter H Tomlins
Traumatic brain injury (TBI) results in direct vascular disruption, triggering edema, and reduction in cerebral blood flow. Therefore, understanding the pathophysiology of brain microcirculation following TBI is important for the development of effective therapies. Optical coherence angiography (OCA) is a promising tool for evaluating TBI in rodent models. We develop an approach to OCA that uses the heart-rate frequency to discriminate between static tissue and vasculature. This method operates on intensity data and is therefore not phase sensitive...
December 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29209882/hemodynamics-of-focal-versus-global-growth-of-small-cerebral-aneurysms
#9
Paolo Machi, Rafik Ouared, Olivier Brina, Pierre Bouillot, Hasan Yilmaz, Maria I Vargas, Renato Gondar, Philippe Bijlenga, Karl O Lovblad, Zsolt Kulcsár
BACKGROUND AND PURPOSE: Hemodynamics play a driving role in the life cycle of brain aneurysms from initiation through growth until eventual rupture. The specific factors behind aneurysm growth, especially in small aneurysms, are not well elucidated. The goal of this study was to differentiate focal versus general growth and to analyze the hemodynamic microenvironment at the sites of enlargement in small cerebral aneurysms. MATERIALS AND METHODS: Small aneurysms showing growth during follow-up were identified from our prospective aneurysm database...
December 5, 2017: Clinical Neuroradiology
https://www.readbyqxmd.com/read/29208850/carotid-artery-stenosis-contralateral-to-acute-tandem-occlusion-an-independent-predictor-of-poor-clinical-outcome-after-mechanical-thrombectomy-with-concomitant-carotid-artery-stenting
#10
Volker Maus, Daniel Behme, Jan Borggrefe, Christoph Kabbasch, Fatih Seker, Cicek Hüseyin, Utako Birgit Barnikol, Leonard Leong Litt Yeo, Patrick Brouwer, Michael Söderman, Markus Möhlenbruch, Marios Nikos Psychogios, Thomas Liebig, Christian Dohmen, Gereon Rudolf Fink, Anastasios Mpotsaris
BACKGROUND AND PURPOSE: Cerebral ischemic strokes due to extra-/intracranial tandem occlusions (TO) of the anterior circulation are responsible for causing mechanical thrombectomy (MT). The impact of concomitant contralateral carotid stenosis (CCS) upon outcome remains unclear in this stroke subtype. METHODS: Retrospective analysis of prospectively collected data of 4 international stroke centers between 2011 and 2017. One hundred ninety-seven consecutive patients with anterior TO were treated with MT and acute carotid artery stenting (CAS)...
November 24, 2017: Cerebrovascular Diseases
https://www.readbyqxmd.com/read/29207853/complications-following-transradial-cerebral-angiography-an-ultrasound-follow-up-study
#11
Wonki Yoon, Woo-Keun Kwon, Omar Choudhri, Jaegeun Ahn, Hanyong Huh, Choel Ji, Huy M Do, Aditya Mantha, Sin-Soo Jeun
Objective: The feasibility and usefulness of transradial catheterization for coronary and neuro-intervention are well known. However, the anatomical change in the catheterized radial artery (RA) is not well understood. Herein, we present the results of ultrasonographic observation of the RA after routine transradial cerebral angiography (TRCA). Methods: Patients who underwent routine TRCA with pre- and post-procedure Doppler ultrasonography (DUS) of the catheterized RA were enrolled...
December 6, 2017: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/29207432/-sonography-of-the-optic-nerve-a-new-bedside-tool-in-intensive-care
#12
Christopher Hohmann, Konrad R Koch, Roman Pfister, Guido Michels
History and clinical findings Here, we present the case history of a 76-year old man with out-of-hospital cardiac arrest due to a cardiogenic shock and a consecutive no-flow-time of approximately 10 minutes. After 25 minutes of resuscitation procedures a spontaneous return of circulation could be established. The patient was admitted to our center for emergency coronary angiography. After coronary stenting the patient was admitted to our intensive care unit and treated in accordance with the guidelines on cardiogenic shock due to myocardial infarction...
December 2017: Deutsche Medizinische Wochenschrift
https://www.readbyqxmd.com/read/29203732/x-ray-angiography-perfusion-imaging-with-an-intra-arterial-injection-comparative-study-with-15o-gas-water-positron-emission-tomography
#13
Katsunori Asai, Hajime Nakamura, Tadashi Watabe, Takeo Nishida, Manabu Sakaguchi, Jun Hatazawa, Toshiki Yoshimine, Haruhiko Kishima
BACKGROUND: X-ray angiography perfusion (XAP) is a perfusion imaging technique based on conventional DSA. OBJECTIVE: In this study, we aimed to validate parameters derived from XAP by comparing them with 15O-gas/water positron emission tomography (PET), using data from patients with chronic ischemic cerebrovascular disease. METHODS: 18 consecutive patients were included. XAP was performed with intra-arterial infusion of contrast media, and a time-density curve was constructed for each cerebral hemisphere...
December 4, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/29199247/utility-of-indocyanine-green-video-angiography-for-sylvian-fissure-dissection-in-subarachnoid-hemorrhage-patients-sylvian-icg-technique
#14
Hiroyuki Toi, Nobuhisa Matsushita, Yukari Ogawa, Keita Kinoshita, Kohei Satoh, Hiroki Takai, Satoshi Hirai, Keijiro Hara, Shunji Matsubara, Masaaki Uno
Indocyanine green (ICG) emits fluorescence in the far-red domain under light excitation. ICG video angiography (ICG-VA) has been established as a useful method to evaluate blood flow in the operative field. We report the usefulness of ICG-VA for Sylvian fissure dissection in patients with subarachnoid hemorrhage (SAH). Subjects comprised 7 patients who underwent ICG-VA before opening the Sylvian fissure during neck clipping for ruptured cerebral aneurysm. We observed contrasted Sylvian veins before opening the Sylvian fissure using surgical microscopes...
December 1, 2017: Neurologia Medico-chirurgica
https://www.readbyqxmd.com/read/29198890/evaluation-of-patency-after-vascular-anastomosis-using-quantitative-evaluation-of-visualization-time-in-indocyanine-green-video-angiography
#15
Shunsuke Nakagawa, Yasuo Murai, Fumihiro Matano, Eitaro Ishisaka, Akio Morita
BACKGROUND: In vascular reconstructive surgery, intraoperative confirmation of the patency is performed by angiography, Doppler, or indocyanine videoangiography, but it is sometimes insufficient. OBJECTIVE: Using the FLOW 800 system (Carl Zeiss, Germany), we confirmed the patency in a quantitative relative evaluation of the timing of the luminance change of the regions of interest (ROIs) on the donor and recipient. METHODS: Thirty-seven patients (58 anastomoses) were divided into two groups: arteriosclerotic ischemic disease (CI group; n=23) or cerebral aneurysm (AN group; n=14)...
November 30, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29197472/frequency-of-inverted-electrocardiographic-t-waves-cerebral-t-waves-in-patients-with-acute-strokes-and-their-relation-to-left-ventricular-wall-motion-abnormalities
#16
Jeremy Stone, Victor Mor-Avi, Agnieszka Ardelt, Roberto M Lang
Transient, symmetric, and deep inverted electrocardiogram (ECG) T waves in the setting of stroke, commonly referred to as cerebral T waves, are rare, and the underlying mechanism is unclear. Our study aimed to test the hypothesis that cerebral T waves are associated with transient cardiac dysfunction. This retrospective study included 800 patients admitted with the primary diagnosis of hemorrhagic or ischemic stroke. ECGs were examined for cerebral T waves, defined as T-wave inversion of ≥5 mm depth in ≥4 contiguous precordial leads...
November 14, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/29191548/evaluation-of-enterprise-stent-assisted-coiling-and-telescoping-stents-technique-as-treatment-of-supraclinoid-blister-aneurysms-of-internal-carotid-artery
#17
Ding Xu, Changwei Zhang, Ting Wang, Chaohua Wang, David F Kallmes, Giuseppe Lanzino, Chao You, Xiaodong Xie
BACKGROUND: and Purpose: Supraclinoid blister aneurysms (BAs) of the internal carotid artery (ICA) are uncommon and deadly, and appropriate treatment is controversial. Endovascular reconstruction may allow treatment through aneurysm isolation. We report a single institution experience of Enterprise stent assisted coiling (ESAC) in the treatment of BAs to appraise safety and efficacy. MATERIALS AND METHODS: Patients treated with ESAC for a BA at our institution from 2013-16 were retrospectively included in this study...
November 27, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29191547/pial-arteriovenous-fistula-a-brief-review-and-report-of-14-surgically-treated-cases
#18
Atul Goel, Sonal Jain, Abhidha Shah, Survendra Rai, Sandeep Gore, Pralhad Dharurkar
AIM: The authors report their successful experience of treating 14 cases of pial arteriovenous fistula (PAVF) by direct surgery. MATERIAL AND METHODS: During the period January 2010 to April 2017, fourteen patients having PAVF were treated by surgery. Only those cases were selected that had a single arterial feeding channel. There were 9 males and 5 females and their ages ranged from 5 to 53 years (average 19 years). Ten patients were less than 20 years of age. Five patients presented clinical and radiological features that suggested hemorrhage from the PAVF...
November 27, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29191534/microsurgical-clipping-of-a-giant-middle-cerebral-artery-aneurysm-with-successful-postoperative-endovascular-mechanical-thrombectomy-for-treatment-of-emergent-large-vessel-occlusion
#19
Joshua T Prickett, Brendan J Klein, Joshua A Cuoco, Biraj M Patel, John C Fraser, Eric A Marvin
BACKGROUND: Giant intracranial aneurysms (>25mm) are uncommon. These lesions typically manifest clinically due to mass effect, acute hemorrhage, or thromboembolic events. To minimize the chances of poor clinical outcome, detailed operative planning and fully integrated considerations and collaboration among neurosurgical and endovascular techniques are essential prior to microsurgical clipping of ruptured giant aneurysms. CASE DESCRIPTION: We describe a case involving a 15 year-old male with a ruptured giant middle cerebral artery aneurysm, treated with microsurgical clipping...
November 27, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29191051/preoperative-evaluation-of-moyamoya-spontaneous-anastomosis-of-combined-revascularization-donor-vessels-in-adults-by-duplex-ultrasonography
#20
Li Chen, Bin Xu, Yong Wang, Yujun Liao, Huiwen Pan, Yi Wang
OBJECTIVE: To evaluate the preoperative diagnostic value of duplex ultrasonography in moyamoya spontaneous anastomosis of combined revascularization donor vessels in adults. METHODS: A total of 99 preoperative adult patients who underwent superficial temporal artery-to-middle cerebral artery (STA-MCA) anastomosis were retrospectively analyzed. Each side of the cerebral hemisphere was examined as a separate procedure. A total of 198 cerebral hemispheres were divided into three groups: a collateral, non-collateral, and control group based on digital subtraction angiography (DSA)...
November 30, 2017: British Journal of Neurosurgery
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