keyword
MENU ▼
Read by QxMD icon Read
search

Middle Cerebral Artery Blood Flow Velocimetry

keyword
https://www.readbyqxmd.com/read/27516829/-transcranial-doppler-in-sickle-cell-disease-scd-in-malagasy-children
#1
Nicolas Fanantenana Herinirina, Lova Hasina Ny Ony Narindra Rajaonarison, Andry Roussel Herijoelison, Olivat Aimée Alson Rakoto, Ahmad Ahmad
INTRODUCTION: Transcranial Doppler is an effective diagnostic tool to detect sickle cell children at risk for stroke. METHODS: We conducted a cross-sectional descriptive study of Malagasy children aged between 24 months and 15 years (group 1: 57 sickle cell diseases, group 2: 43 controls) to assess the cerebral artery velocimetry in the patient population. Transcranial doppler ultrasound with analysis of cerebral blood flow was performed in children of both groups...
2016: Pan African Medical Journal
https://www.readbyqxmd.com/read/27197939/use-of-doppler-velocimetry-in-diagnosis-and-prognosis-of-intrauterine-growth-restriction-iugr-a-review
#2
I Aditya, V Tat, A Sawana, A Mohamed, R Tuffner, T Mondal
Intrauterine growth restriction (IUGR) is a condition which has been difficult to assess at an early stage, resulting in the delivery of children who have poor genetic growth potential. Currently, IUGR classification is based upon the system of ultrasound biometry. Doppler velocimetry allows the measurement of hemodynamic flow of major fetal vessels, comparing the flow indices and patterns of normal and IUGR cases. In this review, the effectiveness of Doppler velocimetry in assessing blood flow in major vessels including the umbilical artery, ductus venosus, and middle cerebral artery was studied for both diagnostic and prognostic screening of IUGR...
May 18, 2016: Journal of Neonatal-perinatal Medicine
https://www.readbyqxmd.com/read/26352077/effect-of-antenatal-betamethasone-administration-on-doppler-velocimetry-of-fetal-and-uteroplacental-vessels-a-prospective-study
#3
Atalay Ekin, Cenk Gezer, Ulas Solmaz, Cuneyt Eftal Taner, Mehmet Ozeren, Askin Dogan, Ibrahim Uyar
OBJECTIVES: To examine the effect of antenatal betamethasone administration on Doppler parameters of fetal and uteroplacental circulation. METHODS: Seventy-six singleton pregnancies that received betamethasone therapy were prospectively evaluated. Doppler measurements of pulsatility indices (PI) in fetal umbilical artery (UA), middle cerebral artery (MCA), ductus venosus and maternal uterine arteries were performed before (0 h) and 24, 48, 72 and 96 h after the first dose of betamethasone...
March 2016: Journal of Perinatal Medicine
https://www.readbyqxmd.com/read/25003473/-effects-of-physical-exercise-on-the-fetal-hemodynamic-parameters
#4
Camila Pigatto, Caroline Mombaque dos Santos, Wendel Mombaque dos Santos, Walter Santos Neme, Luiz Osório Cruz Portela, Edson Nunes de Moraes, Francisco Maximiliano Pancich Gallarreta
PURPOSE: To assess the effects of aerobic physical exercise on the Doppler velocimetry of fetal vessels in pregnant women with no clinical or obstetrical complications. METHODS: A cross-sectional study was conducted on 10 healthy low-risk pregnant women at 2 different gestational times: between the 26th and 29th week and 6 days, and at the end of pregnancy, between the 30th and 35th week. The patients were submitted to aerobic physical exercise on a treadmill until reaching fatigue...
May 2014: Revista Brasileira de Ginecologia e Obstetrícia
https://www.readbyqxmd.com/read/24505960/fetal-pulmonary-and-cerebral-artery-doppler-velocumetry-in-normal-and-high-risk-pregnancy
#5
COMPARATIVE STUDY
Andrzej Breborowicz, Mariusz Dubiel, Marek Pietryga, Grzegorz H Breborowicz, Saemundur Gudmundsson
UNLABELLED: Studies on fetal lung/brain circulation by means of power Doppler technique have suggested a marked reduction in lung perfusion in high-risk pregnancies as a sign of circulation redistribution. The ratio between lung/brain perfusion might therefore give a new method to predict fetal circulation centralization. OBJECTIVE: The aim of the present study was to obtain fetal lung and cerebral artery ratio in normal and high-risk pregnancies. STUDY DESIGN: Doppler samples from proximal right pulmonary artery blood velocities and middle cerebral artery (MCA) were recorded cross-sectionally in 228 normal singleton pregnancies at gestational age 22 to 40 weeks...
January 2014: Ginekologia Polska
https://www.readbyqxmd.com/read/23884278/reversed-end-diastolic-flow-in-the-middle-cerebral-artery-preceding-death-in-a-normally-grown-fetus
#6
REVIEW
Adi Hirshberg, Lisa D Levine, Nadav Schwartz, Celeste P Durnwald
BACKGROUND: Reversed diastolic flow in the middle cerebral artery has been described as a terminal sign in the growth-restricted fetus. The implication of this in a normally grown fetus is unknown. CASE: Middle cerebral artery Doppler velocimetry was performed at 28 weeks of gestation in the setting of decreased fetal movement and a category 2 fetal heart tracing. The middle cerebral artery pulsatility index was elevated, and follow-up studies revealed reversed flow...
August 2013: Obstetrics and Gynecology
https://www.readbyqxmd.com/read/23849713/doppler-velocimetry-of-the-fetal-middle-cerebral-artery-and-other-parameters-of-fetal-well-being-in-neonatal-survival-during-pregnancies-with-placental-insufficiency
#7
Roseli Mieko Yamamoto Nomura, Juliana Ikeda Niigaki, Flávia Thiemi Horigome, Rossana Pulcineli Vieira Francisco, Marcelo Zugaib
OBJECTIVE: To study the Doppler velocimetry of the fetal middle cerebral artery in pregnancies complicated by placental insufficiency, and to verify its role in the prognosis of neonatal survival. METHODS: This was a prospective study of 93 pregnant women with diagnosis of placental insufficiency detected before the 34(th) week of pregnancy. Placental insufficiency was characterized by abnormal umbilical artery (UA) Doppler (> 95(th) percentile). The following parameters were analyzed: umbilical artery (UA) pulsatility index (PI); middle cerebral artery (MCA) PI; brain-placenta ratio--BPR (MCA-PI/UA-PI); MCA peak systolic velocity (MCA-PSV); and PI for veins (PIV) of ductus venosus (DV)...
July 2013: Revista da Associação Médica Brasileira
https://www.readbyqxmd.com/read/23823149/regional-changes-in-brain-blood-flow-during-severe-passive-hyperthermia-effects-of-paco2-and-extracranial-blood-flow
#8
Anthony R Bain, Kurt J Smith, Nia C Lewis, Glen E Foster, Kevin W Wildfong, Christopher K Willie, Geoffrey L Hartley, Stephen S Cheung, Philip N Ainslie
We investigated 1) the regional distribution of cerebral blood flow (CBF), 2) the influence of end-tidal Pco2 (PetCO2) on CBF, and 3) the potential for an extracranial blood "steal" from the anterior brain region during passive hyperthermia. Nineteen (13 male) volunteers underwent supine passive heating until a steady-state esophageal temperature of 2°C above resting was established. Measurements were obtained 1) during normothermia (Normo), 2) during poikilocapnic hyperthermia (Hyper), and 3) during hyperthermia with PetCO2 and end-tidal Po2 clamped to Normo levels (Hyper-clamp)...
September 1, 2013: Journal of Applied Physiology
https://www.readbyqxmd.com/read/23798922/sildenafil-citrate-and-uteroplacental-perfusion-in-fetal-growth-restriction
#9
Marzieh Vahid Dastjerdi, Sayedehafagh Hosseini, Leila Bayani
BACKGROUND: To determine whether the phosphodiesterase type 5 inhibitor, Sildenafil citrate, affects uteroplacental perfusion. MATERIALS AND METHODS: Based on a randomized double-blinded and placebo-controlled trial, forty one pregnant women with documented intrauterine growth retardation at 24-37 weeks of gestation were evaluated for the effect of a single dose of Sildenafil citrate on uteroplacental circulation as determined by Doppler ultrasound study of the umbilical and middle cerebral arteries...
July 2012: Journal of Research in Medical Sciences: the Official Journal of Isfahan University of Medical Sciences
https://www.readbyqxmd.com/read/23797352/fetal-cerebral-hemodynamic-in-gestational-diabetic-versus-normal-pregnancies-a-doppler-velocimetry-of-middle-cerebral-and-umbilical-arteries
#10
Mansoureh Shabani Zanjani, Roya Nasirzadeh, Seyed-Mohammad Fereshtehnejad, Ladan Yoonesi Asl, Seyed-Amir Pooya Alemzadeh, Sareh Askari
Gestational diabetes mellitus (GDM) is one of the most common complications in pregnancies. Evaluating other conditions, including intra uterine growth restriction and pre-eclampsia, some studies have shown significant changes in blood flow velocity of fetal middle cerebral artery (MCA). Our study is one of the few that has aimed to assess the effects of GDM on Doppler parameters of the fetal MCA and umbilical artery (UA) and to compare with normal pregnancies. This cross-sectional study was performed on 66 pregnant women, including 33 women with GDM and the others without it, in Akbar-Abadi University Hospital in Tehran, Iran during 2010-2011...
March 2014: Acta Neurologica Belgica
https://www.readbyqxmd.com/read/23427094/experimental-insights-into-flow-impingement-in-cerebral-aneurysm-by-stereoscopic-particle-image-velocimetry-transition-from-a-laminar-regime
#11
Takanobu Yagi, Ayaka Sato, Manabu Shinke, Sara Takahashi, Yasutaka Tobe, Hiroyuki Takao, Yuichi Murayama, Mitsuo Umezu
This study experimentally investigated the instability of flow impingement in a cerebral aneurysm, which was speculated to promote the degradation of aneurysmal wall. A patient-specific, full-scale and elastic-wall replica of cerebral artery was fabricated from transparent silicone rubber. The geometry of the aneurysm corresponded to that found at 9 days before rupture. The flow in a replica was analysed by quantitative flow visualization (stereoscopic particle image velocimetry) in a three-dimensional, high-resolution and time-resolved manner...
May 6, 2013: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/23342902/-umbilical-cord-collision-in-the-first-trimester-in-a-monoamniotic-twin-pregnancy-does-it-really-matter
#12
Mariola Ropacka-Lesiak, Anna Lebioda, Grzegorz Breborowicz
A case of an umbilical cord collision diagnosed in the first trimester of a monochorionic monoamniotic twin pregnancy is presented. An intensive surveillance included ultrasound monitoring with color and spectral Doppler and fetal echocardiography. The first signs of fetal distress were observed at 31 weeks of gestation. The brain sparing effect as well as a periodic appearance of the "notch" in the wave forms obtained from the umbilical artery from the collision region were observed. In the first ultrasound scan there were no abnormalities in twin I...
September 2012: Ginekologia Polska
https://www.readbyqxmd.com/read/23029945/perinatal-outcome-in-pregnancies-with-intra-uterine-growth-restriction-by-using-umbilical-and-middle-cerebral-artery-colour-doppler
#13
Anita Roy, Swarup Mukherjee, Subir Kumar Bhattacharyya, Prasenjit Banerjee, Bibekananda Das, Kajal Kumar Patra
There are various biophysical methods used for diagnosing and monitoring foetal well being using in intra-uterine growth restriction foetus, out of which Doppler velocimetry proved to possess the predictive capacity in diagnosing and management of intra-uterine growth restriction foetuses. The objectives were to study Doppler velocimetry of foetal umbilical artery and middle cerebral artery in diagnosing intra-uterine growth restriction and to correlate Doppler finding with perinatal outcome. Random 50 patients with singleton pregnancies admitted in RG Kar Medical College and Hospital were studied in a duration of 1 year...
March 2012: Journal of the Indian Medical Association
https://www.readbyqxmd.com/read/22435106/oct-methods-for-capillary-velocimetry
#14
Vivek J Srinivasan, Harsha Radhakrishnan, Eng H Lo, Emiri T Mandeville, James Y Jiang, Scott Barry, Alex E Cable
TO DATE, TWO MAIN CATEGORIES OF OCT TECHNIQUES HAVE BEEN DESCRIBED FOR IMAGING HEMODYNAMICS: Doppler OCT and OCT angiography. Doppler OCT can measure axial velocity profiles and flow in arteries and veins, while OCT angiography can determine vascular morphology, tone, and presence or absence of red blood cell (RBC) perfusion. However, neither method can quantify RBC velocity in capillaries, where RBC flow is typically transverse to the probe beam and single-file. Here, we describe new methods that potentially address these limitations...
March 1, 2012: Biomedical Optics Express
https://www.readbyqxmd.com/read/22384638/-doppler-blood-flow-velocimetry-in-the-umbilical-artery-in-uncomplicated-pregnancy
#15
Tomasz Korbelak, Mariola Ropacka-Lesiak, Grzegorz Breborowicz
OBJECTIVE: To determine the resistance index (RI) and pulsatility (PI) in the umbilical artery (UA) in prediction of abnormal fetal heart rate during labor and poor fetal outcome in term pregnancy. MATERIAL AND METHODS: The study included 148 patients at term in uncomplicated pregnancy Daily evaluation of blood flow in the UA was performed and PI and RI were calculated. The last value before delivery was taken for the analysis. In turn predictive value of Doppler parameters has been determined in the prediction of abnormal FHR during labor and abnormal newborn condition...
January 2012: Ginekologia Polska
https://www.readbyqxmd.com/read/22364302/intrauterine-blood-transfusion-in-immune-hydrops-fetalis-corrects-middle-cerebral-artery-doppler-velocimetry-very-quickly
#16
Ahmet Yalinkaya, Mehmet Sıddık Evsen, Yusuf Celik, Muhammet Erdal Sak, Hatice Ender Soydinc, Mehmet Zeki Taner
The aim of our study was to evaluate the middle cerebral artery velocimetry before and after intrauterine blood transfusion in immune hydrops fetalis. The current study was conducted in a tertiary research hospital, from February 2009 to January 2011. Nineteen intrauterine blood transfusions performed during the study period. The factors recorded were age of the mothers, gestational weeks, pre-transfusion fetal hematocrit and post-transfusion fetal hematocrit, and also middle cerebral artery peak systolic velocimetry (MCA-PSV) was detected and recorded before and after intrauterine transfusion...
February 2012: Bosnian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/22343245/doppler-in-obstetrics-beyond-the-umbilical-artery
#17
REVIEW
Karim D Kalache, Anna Maria Dückelmann
Doppler analysis of the umbilical and uterine arteries has long been performed in perinatal medicine to assess fetal health and maternal risk for preeclampsia. Several other vessels can be interrogated to obtain additional, vital information. Velocimetry in the fetal middle cerebral artery can yield evidence of the presence or absence of anemia and, in cases of delayed growth, of the risk of hypoxic damage. Ductus venosus waveforms are a very good indicator of impeding fetal jeopardy and should be used when umbilical artery waveforms become abnormal...
March 2012: Clinical Obstetrics and Gynecology
https://www.readbyqxmd.com/read/22120259/hemodynamic-analysis-of-growing-intracranial-aneurysms-arising-from-a-posterior-inferior-cerebellar-artery
#18
Shin-Ichiro Sugiyama, Hui Meng, Kenichi Funamoto, Takashi Inoue, Miki Fujimura, Toshio Nakayama, Shunsuke Omodaka, Hiroaki Shimizu, Akira Takahashi, Teiji Tominaga
OBJECTIVE: The role of hemodynamics in the growth of intracranial aneurysms is not completely clear. We present a hemodynamic study with two adjacent unruptured aneurysms arising from one parent artery but growing in different ways. This study aimed to investigate whether there were differences in hemodynamic characteristics between the two growing aneurysms. METHODS: A 62-year-old female patient presented with six unruptured intracranial aneurysms. Catheter angiography at 6-month intervals revealed that two aneurysms located adjacently at the right posterior inferior cerebellar artery were growing over a 1-year period...
November 2012: World Neurosurgery
https://www.readbyqxmd.com/read/21845346/-comparison-of-doppler-indexes-to-predict-small-infants-for-gestational-age-in-pregnant-women-with-hypertensive-syndromes
#19
COMPARATIVE STUDY
Alex Sandro Rolland Souza, Mário José Vasconcelos Neto, Adriana Scavuzzi Carneiro da Cunha, Eveline de Fátima Catão Monteiro, Melania Maria Ramos de Amorim
PURPOSE: to determine the best Doppler flow velocimetry index to predict small infants for gestational age (SGAI), in pregnant women with hypertensive syndromes. METHODS: a cross-sectional study was conducted enrolling 129 women with high blood pressure, submitted to doppler velocimetry up to 15 days before delivery. Women with multiple fetuses, fetal malformations, genital bleeding, placental abruption, premature rupture of fetal membranes, smoking, use of illicit drugs, and chronic diseases were excluded...
April 2011: Revista Brasileira de Ginecologia e Obstetrícia
https://www.readbyqxmd.com/read/21735685/-doppler-blood-flow-velocimetry-in-the-middle-cerebral-artery-in-uncomplicated-pregnancy
#20
Mariola Ropacka-Lesiak, Tomasz Korbelak, Grzegorz Breborowicz
OBJECTIVE: To determine the resistance index (RI) and pulsatility (PI) in the middle cerebral artery (MCA) in prediction of abnormal fetal heart rate during labor and poor fetal outcome in term pregnancy. MATERIAL AND METHODS: The study included 148 patients at term in uncomplicated pregnancy Daily evaluation of blood flow in the MCA was performed and PI and RI were calculated. The last value before delivery was taken for the analysis. The predictive value of Doppler parameters has been determined in turn to predict abnormal FHR during labor and abnormal newborn condition...
March 2011: Ginekologia Polska
keyword
keyword
24488
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"