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Middle cerebral artery doppler

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https://www.readbyqxmd.com/read/29330635/hypotension-due-to-spinal-anesthesia-influences-fetal-circulation-in-primary-caesarean-sections
#1
K Lato, I Bekes, Peter Widschwendter, T W P Friedl, W Janni, F Reister, G Froeba, U Friebe-Hoffmann
PURPOSE: Hypotension due to spinal anesthesia is a well-known side effect in pregnant women receiving caesarean section. Little is known about its impact on fetal blood circulation. METHODS: 40 women with uncomplicated singleton term pregnancies prepared for caesarean section were prospectively evaluated by Doppler sonography before and immediately after spinal anesthesia. RESULTS: In 90% of the women, blood pressure significantly decreased after spinal anesthesia and 42...
January 12, 2018: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/29326857/role-of-color-doppler-flowmetry-in-prediction-of-intrauterine-growth-retardation-in-high-risk-pregnancy
#2
Sachin Khanduri, Saakshi Chhabra, Santosh Yadav, Tushar Sabharwal, Mriganki Chaudhary, Tarim Usmani, Aakshit Goyal, Hritik Sharma
OBJECTIVE: To evaluate the usefulness of Color Doppler flowmetry in the prediction of intrauterine growth restriction (IUGR) in high-risk pregnancies. MATERIALS AND METHOD: A total of 62 high-risk pregnant women underwent Color Doppler flowmetric umbilical artery pulsatility index (PI), resistive index (RI) and systolic/diastolic (S/D) ratio, middle cerebral artery PI, RI and S/D ratio, Ductus venosus S-wave/isovolumetric A-wave index (SIA) and vertebral artery RI at 23-27 weeks, 28-32 weeks and 32-36 weeks of their pregnancy...
November 8, 2017: Curēus
https://www.readbyqxmd.com/read/29315509/carotid-plaque-volume-in-patients-undergoing-carotid-endarterectomy
#3
S Ball, S Rogers, K Kanesalingam, R Taylor, E Katsogridakis, C McCollum
BACKGROUND: The main indication for carotid endarterectomy (CEA) is severity of carotid artery stenosis, even though most strokes in carotid disease are embolic. The relationship between carotid plaque volume (CPV) and symptoms of cerebral ischaemia, and the measurement of CPV by minimally invasive tomographic ultrasound imaging, were investigated. METHODS: The volume of the endarterectomy specimen was measured using a validated saline suspension technique in patients undergoing CEA...
January 8, 2018: British Journal of Surgery
https://www.readbyqxmd.com/read/29310958/increased-left-ventricular-filling-pressure-and-arterial-occlusion-in-stroke-related-to-atrial-fibrillation
#4
Wi-Sun Ryu, Eun-Kee Bae, Soo-Hyun Park, Sang-Wuk Jeong, Dawid Schellingerhout, Matthias Nahrendorf, Dong-Eog Kim
BACKGROUND: We investigated whether left ventricular filling pressure is associated with arterial occlusion in patients with ischemic stroke related to atrial fibrillation (AF). METHODS: Ninety-nine patients with AF-related stroke were included. Left ventricular filling pressure was assessed by E (early mitral inflow velocity)/e' (early diastolic velocity of the mitral valve annulus velocity) ratio based on tissue Doppler echocardiography. Arterial occlusion was evaluated by computed tomography or magnetic resonance angiography...
January 5, 2018: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/29305914/the-comparison-of-monitoring-of-cerebral-blood-flow-by-c-flow-and-transcranial-doppler-in-carotid-endarterectomy
#5
Xu Wang, Bin Yang, Yan Ma, Peng Gao, Yabing Wang, Yanfei Chen, Liqun Jiao, Feng Ling, Guoguang Zhao
OBJECTIVE: To prospectively compare the use of the c-FLOW (cerebral blood flow monitor) and transcranial Doppler (TCD) as two techniques for assessing brain perfusion during carotid endarterectomy (CEA). METHODS: This was a prospective, single center, observational study. All patients were monitored using c-FLOW and TCD during the operation. Changes from baseline values of cerebral blood flow index (CFI) and blood flow velocity of middle cerebral artery (V-MCA) were recorded following carotid artery clamping and unclamping...
January 3, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29298964/-assessment-of-relationship-between-doppler-flows-in-pregnancies-after-41-week-and-the-incidence-of-cesarean-sections-with-induced-labour
#6
Hanna Makles, Jacek R Wilczyński
HASH(0x3cbf9c8) AIM: The aim of the study was to assess a relationship between the Doppler flows in foetal vessels, i.e. the middle cerebral artery (MCA), umbilical artery (UMA), umbilical vein (UV) and ductus venosus (DV) as well as in maternal vessels, i.e. the right uterine artery (UAR), left uterine artery (UAL) and the incidence of cesarean sections in pregnancies after 41 week with induced labour. MATERIALS AND METHODS: The study included 130 pregnant women, including 100 pregnant women, between 41 and 42 weeks of gestation, in whom induced labour resulted in a cesarean section due to three main indications: lack of progress of labour (Group I-44), signs of foetal distress (Group II-32) and lack of response to induced labour (Group III-24)...
December 22, 2017: Polski Merkuriusz Lekarski: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/29287136/cerebrovascular-hemodynamics-in-fetuses-with-congenital-heart-disease
#7
Tingting Man, Yihua He, Ying Zhao, Lin Sun, Xiaowei Liu, Shuping Ge
BACKGROUND AND OBJECTIVE: It is hypothesized that diminished cerebral vascular resistance or the "brain sparing effect" is associated with fetuses with complex congenital heart defects (CHD) and may affect their neurodevelopmental outcome. An alternative explanation is that it is related to the location, cardiac output, pressure, and resistance in left heart obstructive CHDs. We sought to determine the effects of various left and right heart obstructive defects on the cerebral and placental hemodynamics and to evaluate the utility of these variables for the assessment and prognosis of CHDs...
December 2017: Echocardiography
https://www.readbyqxmd.com/read/29281153/microvascular-perfusion-of-the-placenta-developing-fetal-liver-and-lungs-assessed-with-intravoxel-incoherent-motion-imaging
#8
András Jakab, Ruth L Tuura, Raimund Kottke, Nicole Ochsenbein-Kölble, Giancarlo Natalucci, Thi Dao Nguyen, Christian Kellenberger, Ianina Scheer
BACKGROUND: In utero intravoxel incoherent motion magnetic resonance imaging (IVIM-MRI) provides a novel method for examining microvascular perfusion fraction and diffusion in the developing human fetus. PURPOSE: To characterize gestational changes in the microvascular perfusion fraction of the placenta, fetal liver, and lungs using IVIM-MRI. STUDY TYPE: Retrospective, cross-sectional study. SUBJECTS: Fifty-five datasets from 33 singleton pregnancies were acquired (17-36 gestational weeks)...
December 27, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29244749/serum-levels-of-s100b-and-nse-proteins-in-patients-with-non-transfusion-dependent-thalassemia-as-biomarkers-of-brain-ischemia-and-cerebral-vasculopathy
#9
Aikaterini Kanavaki, Konstantinos Spengos, Maria Moraki, Polyxeni Delaporta, Catherine Kariyannis, Ioannis Papassotiriou, Antonis Kattamis
Patients with non-transfusion-dependent thalassemia (NTDT) are at risk of developing brain ischemia. Transcranial Doppler (TCD) has been established as a useful screening tool of cerebrovascular disease in patients with sickle cell disease. Proteins neuron specific enolase (NSE) and S100B are biomarkers that reflect CNS injury. The purpose of this study is to evaluate cerebral vessel vasculopathy and brain damage in NTDT patients using non-invasive methods as TCD and measurement serum levels of NSE and S100B...
December 15, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29240037/fetal-anemia-causing-hydrops-fetalis-from-an-alpha-globin-variant-homozygous-hemoglobin-constant-spring
#10
Patcharee Komvilaisak, Ratana Komvilaisak, Arunee Jetsrisuparb, Surapon Wiangnon, Junya Jirapradittha, Pakaphan Kiatchoosakun, Goonapa Fucharoen
BACKGROUND: Fetal anemia is often assumed to be due to red cell alloimmunization and Parvovirus infection, and can lead to hydrops fetalis and death in utero. Other causes, such as mutations of hemoglobin alpha, are less commonly considered. METHODS: We report 7 cases with fetal anemia causing hydrops fetalis. Serial Doppler ultrasound for measurement peak systolic velocity (PSV) of middle cerebral artery (MCA) was used for evaluation of fetal anemia. Fetal anemia is suggested if the MCA/PSV ratio is >1...
December 12, 2017: Journal of Pediatric Hematology/oncology
https://www.readbyqxmd.com/read/29239696/compression-garments-and-cerebral-blood-flow-influence-on-cognitive-and-exercise-performance
#11
Brittany A Smale, Joseph M Northey, Disa J Smee, Nathan G Versey, Ben Rattray
This study aimed to describe the effect of compression garments on middle cerebral artery blood flow velocity (MCAv) in relation to cognitive and exercise performance whilst cycling. In a randomised-controlled-cross-over design, 15 well-trained male cyclists were recruited to participate in three identical trials wearing loose fitting shorts (control), low-grade, or medium-grade compression garments. The protocol involved four 8 min increments of cycling at 30%, 50%, 70%, and 85% maximal power output and a 4 km time-trial...
December 14, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/29235099/variations-from-morning-to-afternoon-of-middle-cerebral-and-umbilical-artery-blood-flow-and-fetal-heart-rate-variability-and-fetal-characteristics-in-the-normally-developing-fetus
#12
Tehila Avitan, Ari Sanders, Ursula Brain, Dan Rurak, Tim F Oberlander, Ken Lim
OBJECTIVE: To determine if there are changes in maternal uterine blood flow, fetal brain blood flow, fetal heart rate variability, and umbilical blood flow between morning (AM) and afternoon (PM) in healthy, uncomplicated pregnancies. STUDY DESIGN: In this prospective study, 68 uncomplicated singleton pregnancies (mean 35 + 0.7 weeks gestation) underwent a standard observational protocol at both 08:00 (AM) and 13:30 (PM) of the same day. This protocol included Doppler measurements of uterine, umbilical, and fetal middle cerebral artery (MCA) volume flow parameters (flow, HR, peak systolic velocity [PSV], PI, and RI) followed by computerized cardiotocography...
December 13, 2017: Journal of Clinical Ultrasound: JCU
https://www.readbyqxmd.com/read/29229867/intracranial-pulsatility-in-patients-with-cerebral-small-vessel-disease-a-systematic-review
#13
Yulu Shi, Michael J Thrippleton, Ian Marshall, Joanna M Wardlaw
Growing evidence suggests that increased intracranial pulsatility is associated with cerebral small vessel disease (SVD). We systematically reviewed papers that assessed intracranial pulsatility in subjects with SVD. We included 27 cross-sectional studies (n=3356): 20 used Doppler ultrasound and 7 used phase-contrast MRI. Most studies measured pulsatility in the internal carotid or middle cerebral arteries (ICA, MCA), whereas few assessed veins or cerebrospinal fluid (CSF). Methods to reduce bias and risk factor adjustment were poorly reported...
January 16, 2018: Clinical Science (1979-)
https://www.readbyqxmd.com/read/29228401/middle-cerebral-artery-doppler-changes-following-fetal-transfusion-performed-with-and-without-fetal-anesthesia
#14
Kristen R Uquillas, Myrna S Aboudiab, Lisa M Korst, Arlyn Llanes, Brendan H Grubbs, Ramen H Chmait
No abstract text is available yet for this article.
December 11, 2017: American Journal of Perinatology
https://www.readbyqxmd.com/read/29227585/effect-of-ultrafiltration-on-placental-fetal-blood-flow-in-pregnancy-of-woman-undergoing-chronic-hemodialysis
#15
Luiz Paulo José Marques, Paulo Roberto Silva Marinho, Regina Rocco, Caroline de Azevedo Martins, Henrique Novo Costa Pereira, Ana Clara Lopes Barbosa Ferreira
INTRODUCTION: Patient who was undergoing hemodialysis (HD) thrice weekly usually gain 1 to 4 kg of weight in interdialytic period, mainly due to fluid accumulation by ingestion of water. Ultrafiltration (UF) during HD will be need to remove fluid excess to avoid severe medical complications secondary to fluid overload. However, in pregnant woman UF can increase the episodes of intradialytic hypotension which may lead to placental ischemic injury and predispose to fetal distress. There is little information about safe fluid amount withdrawn by UF during pregnancy...
December 11, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/29201539/assessment-of-cerebral-blood-flow-with-magnetic-resonance-imaging-in-children-with-sickle-cell-disease-a-quantitative-comparison-with-transcranial-doppler-ultrasonography
#16
Paula L Croal, Jackie Leung, Przemyslaw Kosinski, Manohar Shroff, Isaac Odame, Andrea Kassner
Introduction: Transcranial Doppler ultrasonography (TCD) is a clinical tool for stratifying ischemic stroke risk by identifying abnormal elevations in blood flow velocity (BFV) in the middle cerebral artery (MCA). However, TCD is not effective at screening for subtle neurologic injury such as silent cerebral infarcts. To better understand this disparity, we compared TCD measures of BFV with tissue-level cerebral blood flow (CBF) using arterial spin-labeling MRI in children with and without sickle cell disease, and correlated these measurements against clinical hematologic measures of disease severity...
November 2017: Brain and Behavior
https://www.readbyqxmd.com/read/29198890/evaluation-of-patency-after-vascular-anastomosis-using-quantitative-evaluation-of-visualization-time-in-indocyanine-green-video-angiography
#17
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/29191476/the-association-between-serum-uric-acid-and-asymptomatic-intracranial-arterial-stenosis-in-middle-aged-koreans
#18
J K Ahn, J Hwang, J H Hwang, W T Yoon, P W Chung, S Ryu
BACKGROUND AND AIMS: Intracranial arterial stenosis (ICAS) is one of the most common causes of stroke, especially in Asians. Hyperuricemia has been associated with an increased risk of comorbidities such as metabolic syndrome or cardiovascular diseases. However, there are few studies focusing on the association between serum uric acid (SUA) levels and asymptomatic ICAS. The aim of this study was to explore the association between SUA and the prevalence of ICAS in middle-aged Korean health screening examinees...
October 27, 2017: Nutrition, Metabolism, and Cardiovascular Diseases: NMCD
https://www.readbyqxmd.com/read/29190150/intravenous-saline-administration-in-patients-with-severe-acquired-brain-injury-and-orthostatic-intolerance-for-tilt-table-mobilization
#19
Christian Riberholt, Niels Olesen, Peter Hovind, Jesper Mehlsen, Tue Hvass Petersen
PRIMARY OBJECTIVE: This study aimed to investigate the effect of intravenous saline administration on orthostatic hypotension (OH) during head up tilt (HUT) and the change in the renin-angiotensin-aldosterone system before and after HUT in patients with severe acquired brain injury (ABI). RESEARCH DESIGN: The study is designed as an observational study. METHODS AND PROCEDURES: Fourteen patients with ABI, low level of consciousness and OH were monitored before, during and after HUT with non-invasive beat-to-beat blood pressure measurement, and transcranial Doppler determination of middle cerebral artery blood flow velocity...
November 30, 2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/29189269/comparison-of-transcranial-doppler-and-ultrasound-tagged-near-infrared-spectroscopy-for-measuring-relative-changes-in-cerebral-blood-flow-in-human-subjects
#20
Michael S Lipnick, Elizabeth A Cahill, John R Feiner, Philip E Bickler
BACKGROUND: Currently, no reliable method exists for continuous, noninvasive measurements of absolute cerebral blood flow (CBF). We sought to determine how changes measured by ultrasound-tagged near-infrared spectroscopy (UT-NIRS) compare with changes in CBF as measured by transcranial Doppler (TCD) in healthy volunteers during profound hypocapnia and hypercapnia. METHODS: Ten healthy volunteers were monitored with a combination of TCD, UT-NIRS (c-FLOW, Ornim Medical), as well as heart rate, blood pressure, end-tidal PCO2 (PEtCO2), end-tidal O2, and inspired O2...
November 14, 2017: Anesthesia and Analgesia
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