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Fetal cerebral artery

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https://www.readbyqxmd.com/read/28635180/renal-vascularization-indexes-and-fetal-hemodynamics-in-fetuses-with-growth-restriction
#1
Giovana Farina Doro, Janaína Campos Senra, Agatha Sacramento Rodrigues, Seizo Miyadahira, Renata Lopes Ribeiro, Rossana Pulcinelli Vieira, Lisandra Stein Bernardes
OBJECTIVE: To identify the correlation between the renal vascularization index (VI), the flow index (FI) and the vascularization and flow index (VFI) and placental and fetal hemodynamics in fetuses with growth restriction. METHOD: Bidimensional ultrasound and three-dimensional power Doppler with the VOCAL technique were used to determine the renal vascular indexes and fetal and placental hemodynamics in fetuses below the 10(th) percentile for fetal weight. Partial correlation analysis (controlled for renal depth and gestational age) was performed...
June 20, 2017: Prenatal Diagnosis
https://www.readbyqxmd.com/read/28628847/the-importance-of-declining-insulin-requirements-during-pregnancy-in-patients-with-pre-gestational-gestational-diabetes-mellitus
#2
Maya Ram, Larissa Feinmesser, Shiri Shinar, Sharon Maslovitz
OBJECTIVE: In patients with pre-gestational and gestational diabetes mellitus (GDM), insulin requirements often increase during the third trimester of pregnancy in order to maintain proper glycemic control. However, a fraction of patients demonstrate a significant decrease in insulin requirements in late gestation. We aimed to evaluate the clinical significance of decreasing insulin requirements in patients with pre-gestational diabetes and GDM with respect to fetal wellbeing and pregnancy outcome...
June 3, 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/28611933/monochorionic-triamniotic-triplet-pregnancy-complicated-by-twin-reversed-arterial-perfusion-sequence-case-report-and-literature-review
#3
Pingshan Pan, Guoyang Luo, Lu Tang, Jeanne D Rolle, Yuqin Qin, Quan Zeng, Jiangting Wei, Yuanfang Chen, Hongwei Wei
Background  Monochorionic-triamniotic pregnancies are rare and fraught with complications. Case  A case of monochorionic-triamniotic triplet pregnancy complicated by twin reversed arterial perfusion (TRAP) sequence is presented. The patient declined termination or selective fetal reduction. Triplet C was acardiac. At 24 weeks, triplet B developed polyhydramnios. At 30 weeks, polyhydramnios was seen in all three amniotic sacs, but without signs of fetal hydrops and with normal Doppler velocimetry measurements in the umbilical artery, middle cerebral artery, and ductus arteriosus of triplets A and B...
April 2017: American Journal of Perinatology Reports
https://www.readbyqxmd.com/read/28596740/ultrasound-imaging-of-mouse-fetal-intracranial-hemorrhage-due-to-ischemia-reperfusion
#4
Kenichi Funamoto, Takuya Ito, Kiyoe Funamoto, Clarissa L Velayo, Yoshitaka Kimura
Despite vast improvement in perinatal care during the 30 years, the incidence rate of neonatal encephalopathy remains unchanged without any further Progress towards preventive strategies for the clinical impasse. Antenatal brain injury including fetal intracranial hemorrhage caused by ischemia/reperfusion is known as one of the primary triggers of neonatal injury. However, the mechanisms of antenatal brain injury are poorly understood unless better predictive models of the disease are developed. Here we show a mouse model for fetal intracranial hemorrhage in vivo developed to investigate the actual timing of hypoxia-ischemic events and their related mechanisms of injury...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28591361/doppler-velocimetry-in-fetal-rats-exposed-to-enoxaparin-and-unfractionated-heparin-ufh-during-pregnancy
#5
Flavio Renato de Almeida Senefonte, Ricardo Dutra Aydos, Vanessa Marcon de Oliveira, Marco Antonio Costa Bósio, Ernesto Antonio Figueiró-Filho
Purpose: To evaluate the effects of enoxaparin and unfractionated heparin (UFH) administered in prophylactic and therapeutic doses on fetal vessels in healthy pregnant Wistar rats, according to Doppler velocimetry measurements. Methods: Fifty animals were assigned to one of five groups: controls (saline), prophylactic and therapeutic enoxaparin (1 and 2 mg/kg/day, respectively), and prophylactic and therapeutic UFH (72 and 400 UI/kg/day, respectively). Uterine horns were examined by ultrasound for identification of live fetuses...
May 2017: Acta Cirúrgica Brasileira
https://www.readbyqxmd.com/read/28571031/perimortem-demonstration-and-treatment-of-recipient-to-donor-transfusion-in-monochorionic-diamniotic-twin-gestation
#6
Jessica Parrott, Tricia Schwartz, Tracy Cowles, Marium Holland, Carl P Weiner
Twin-twin transfusion syndrome is a complication of monochorionic-diamniotic placentation. Should one twin die, ≈30% of co-twins will also die, and if they survive, ≈30% experience severe morbidity rates, each believed secondary to hemorrhage of the co-twin into the deceased twin. We report apparently the first ultrasound-documented case of perimortem hemorrhage in twin-twin transfusion syndrome and its treatment by emergent ultrasound-guided percutaneous cord occlusion followed by percutaneous fetal intravascular transfusion...
June 2, 2017: Fetal Diagnosis and Therapy
https://www.readbyqxmd.com/read/28566491/chronic-hypoxia-alters-fetal-cerebrovascular-responses-to-endothelin%C3%A2-1
#7
Jinjutha Silpanisong, Dahlim Kim, James M Williams, Olayemi Adeoye, Richard Thorpe, William J Pearce
In utero hypoxia influences the structure and function of most fetal arteries, including those of the developing cerebral circulation. Whereas the signals that initiate this hypoxic remodeling remain uncertain, these appear to be distinct from the mechanisms that maintain the remodeled vascular state. The present study explores the hypothesis that chronic hypoxia elicits sustained changes in fetal cerebrovascular reactivity to endothelin‑1 (ET-1), a potent vascular contractant and mitogen. In fetal lambs, chronic hypoxia (3820 m altitude for the last 110 days of gestation) had no significant effect on plasma ET-1 levels or ETA receptor density in cerebral arteries but enhanced contractile responses to ET-1 in an ETA-dependent manner...
May 31, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/28559076/prenatal-diagnosis-and-multimodal-neonatal-treatment-of-a-rare-pial-arteriovenous-fistula-case-report-and-review-of-the-literature
#8
Alessandro Pedicelli, Marta Iacobucci, Paolo Frassanito, Emilio Lozupone, Concezio Di Rocco, Cesare Colosimo
Intracranial pial arteriovenous fistulas (PAVFs) are direct communications between the arterial and venous system of the brain, with the characteristic absence of a plexiform nidus, as seen in the classic cerebral arteriovenous malformations. These vascular malformations, usually occurring in the pediatric population, are very rarely diagnosed in uterus, due to a lack of understanding of the condition and because they may be hard to visualize. We report a rare case of a mass effect PAVF diagnosed with fetal MRI, involving the right cerebral hemisphere, fed by a pericallosal artery and associated with a giant venous dilatation...
May 27, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28556937/abnormal-fetal-findings-associated-with-a-global-sphericity-index-of-the-4-chamber-view-below-the-5th-centile
#9
Greggory R DeVore, Gary Satou, Mark Sklansky
OBJECTIVES: The purpose of this study was to evaluate the global sphericity index (GSI) of the 4-chamber view and correlate the results with abnormal ultrasound findings. METHODS: The epicardial end-diastolic basal-apical length (BAL) and transverse length (TL) of the 4-chamber view were measured to compute the GSI (BAL/TL) in 200 control fetuses between 20 and 40 weeks' gestation. Three hundred study fetuses were prospectively examined between 17 and 39 weeks' gestation...
May 30, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28554529/maternal-alcohol-exposure-during-mid-pregnancy-dilates-fetal-cerebral-arteries-via-endocannabinoid-receptors
#10
Olga Seleverstov, Ana Tobiasz, J Scott Jackson, Ryan Sullivan, Dejian Ma, J Pierce Sullivan, Steven Davison, Yada Akkhawattanangkul, Danielle L Tate, Terry Costello, Stacey Barnett, Wei Li, Giancarlo Mari, Alex M Dopico, Anna N Bukiya
Prenatal alcohol exposure often results in fetal alcohol syndrome and fetal alcohol spectrum disorders. Mechanisms of fetal brain damage by alcohol remain unclear. We used baboons (Papio spp.) to study alcohol-driven changes in the fetal cerebral artery endocannabinoid system. Pregnant baboons were subjected to binge alcohol exposure via gastric infusion three times during a period equivalent to the second trimester of human pregnancy. A control group was infused with orange-flavored drink that was isocaloric to the alcohol-containing solution...
June 2017: Alcohol
https://www.readbyqxmd.com/read/28551596/pure-posterior-communicating-artery-occlusion-treated-with-mechanical-thrombectomy
#11
Ryosuke Otsuji, Katsuharu Kameda, Junji Uno, Hidefuku Gi
There has been no report of mechanical thrombectomy for a pure posterior communicating artery (PComA) occlusion. Here, we report the case of an 87-year-old woman with a disturbance of consciousness and left hemiparesis diagnosed with a right PComA occlusion. The patient was successfully treated using mechanical thrombectomy in combination with a stent retriever and the Penumbra system. A CT perfusion image showed cerebral blood flow reduction in the ipsilateral occipital lobe and thalamus. A CT angiography supported the diagnosis of an occlusion of fetal type PComA...
May 27, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28550175/chronic-hypoxia-attenuates-the-vasodilator-efficacy-of-protein-kinase-g-in-fetal-and-adult-ovine-cerebral-arteries
#12
Richard B Thorpe, Margaret C Hubbell, Jinjutha Silpanisong, James M Williams, William J Pearce
Long-term hypoxia (LTH) attenuates nitric oxide (NO) induced vasorelaxation in ovine middle cerebral arteries. Because cGMP-dependent protein kinase (PKG) is an important mediator of NO signaling in vascular smooth muscle, we tested the hypothesis that LTH diminishes the ability of PKG to interact with target proteins and cause vasorelaxation. Prominent among proteins that regulate vascular tone is the large conductance calcium-sensitive potassium (BK) channel, which is a substrate for PKG and is responsive to phosphorylation on multiple serine/threonine residues...
May 26, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28546663/comparison-of-outcome-of-normal-and-high-risk-pregnancies-based-upon-cerebroplacental-ratio-assessed-by-doppler-studies
#13
Anita Kant, Namrata Seth, Deepti Rastogi
OBJECTIVES: To evaluate the cerebroplacental ratio which is the ratio of pulsatility index of fetal middle cerebral and umbilical arteries, in normal and high-risk pregnancies during 30-36 weeks of gestation. METHODS: In this study, we included 70 patients, who were scanned for Doppler parameters of Middle cerebral artery and Umbilical artery pulsatility index ratio of fetus, between 30 and 36 weeks, and then were followed till delivery. Thirty-five patients with normal pregnancy and 35 patients with high-risk pregnancy were included...
June 2017: Journal of Obstetrics and Gynaecology of India
https://www.readbyqxmd.com/read/28541503/reduced-efficacy-of-the-pipeline-embolization-device-in-the-treatment-of-posterior-communicating-region-aneurysms-with-fetal-posterior-cerebral-artery-configuration
#14
Anil K Roy, Brian M Howard, Diogo C Haussen, Joshua W Osbun, Sameer H Halani, Susana L Skukalek, Frank Tong, Raul G Nogueira, Jacques E Dion, Charles M Cawley, Jonathan A Grossberg
BACKGROUND: Aneurysms at the origin of the posterior communicating artery (PcommA) have been demonstrated to be effectively treated with the pipeline embolization device (PED). Much less is known about the efficacy of the PED for aneurysms associated with a fetal posterior cerebral artery (fPCA) variant. OBJECTIVE: To study PED treatment efficacy of PcommA aneurysms, including fPCA aneurysms. METHODS: A prospectively maintained university database of aneurysm patients treated with the PED was retrospectively reviewed...
May 25, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28467985/effects-of-antenatal-melatonin-treatment-on-the-cerebral-vasculature-in-an-ovine-model-of-fetal-growth-restriction
#15
Margie Castillo-Melendez, Tamara Yawno, Amy Sutherland, Graham Jenkin, Euan M Wallace, Suzanne L Miller
Chronic moderate hypoxia, such as occurs in fetal growth restriction (FGR) during gestation, compromises the blood-brain barrier (BBB) and results in structural abnormalities of the cerebral vasculature. We have previously determined the neuroprotective and antioxidant effects of maternal administration of melatonin (MLT) on growth-restricted newborn lambs. The potential of maternal MLT therapy for the treatment of cerebrovascular dysfunction-associated developmental hypoxia has also been demonstrated in newborn lambs...
May 4, 2017: Developmental Neuroscience
https://www.readbyqxmd.com/read/28436166/perinatal-loss-at-term-the-role-of-uteroplacental-and-fetal-doppler-assessment
#16
Caitriona Monaghan, Julia Binder, Baskaran Thilaganathan, José Morales-Roselló, Asma Khalil
OBJECTIVE: To examine the association of uterine artery (UtA) Doppler indices and cerebroplacental ratio (CPR) on perinatal outcome at term. METHODS: This retrospective cohort study conducted in a single tertiary referral centre included all singleton pregnancies undergoing ultrasound assessment in the third trimester, which subsequently delivered at term. Fetal biometry and Dopplers including the umbilical artery (UA), middle cerebral artery (MCA) and uterine artery were recorded...
April 24, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28413694/first-neonatal-demise-with-travel-associated-zika-virus-infection-in-the-united-states-of-america
#17
Nikolaos Zacharias, Janice Whitty, Sarah Noblin, Sophia Tsakiri, Jose Garcia, Michael Covinsky, Meenakshi Bhattacharjee, David Saulino, Nina Tatevian, Sean Blackwell
Zika virus is increasingly recognized as a fetal pathogen worldwide. We describe the first case of neonatal demise with travel-associated Zika virus infection in the United States of America, including a novel prenatal ultrasound finding. A young Latina presented to our health care system in Southeast Texas for prenatal care at 23 weeks of gestation. Fetal Dandy-Walker malformation, asymmetric cerebral ventriculomegaly, single umbilical artery, hypoechoic fetal knee, dorsal foot edema, and mild polyhydramnios were noted upon initial screening prenatal sonography at 26 weeks...
April 2017: American Journal of Perinatology Reports
https://www.readbyqxmd.com/read/28409154/suspected-fetal-growth-restriction-at-37-weeks-a-comparison-of-doppler-and-placental-pathology
#18
William M Curtin, Karmaine A Millington, Tochi O Ibekwe, Serdar H Ural
Objective. Our objective was determining if abnormal Doppler evaluation had a higher prevalence of placental pathology compared to normal Doppler in suspected fetal growth restriction (FGR) of cases delivered at 37 weeks. Study Design. This retrospective cohort study of suspected FGR singletons with antenatal Doppler evaluation delivered at 37 weeks had a primary outcome of the prevalence of placental pathology related to FGR. Significance was defined as p ≤ 0.05. Results. Of 100 pregnancies 46 and 54 were in the abnormal and normal Doppler cohorts, respectively...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28403927/relevance-of-routine-doppler-sampling-at-the-two-umbilical-arteries-in-the-follow-up-of-dichorionic-twin-pregnancies-with-intrauterine-growth-restricted-fetuses
#19
A J Vivanti, E Lecarpentier, A-G Cordier, F Proulx, V Tsatsaris, A Benachi
OBJECTIVE: The aim of this study is to assess if the presence of bilateral absent or reverse end-diastolic velocity (AREDV) indicates a poorer prognosis than unilateral AREDV in dichorionic-diamniotic twin pregnancies complicated by intrauterine growth restriction. METHODS: A prospective observational study of 36 dichorionic-diamniotic twin pregnancies complicated by intrauterine growth restriction. One hundred and fifty seven ultrasound (US) examinations were performed...
March 2017: Journal of gynecology obstetrics and human reproduction
https://www.readbyqxmd.com/read/28396818/comment-on-failure-of-the-pipeline-embolization-device-in-posterior-communicating-artery-aneurysms-associated-with-a-fetal-posterior-cerebral-artery
#20
COMMENT
Visish M Srinivasan, Peter Kan
No abstract text is available yet for this article.
2017: Case Reports in Vascular Medicine
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