keyword
MENU ▼
Read by QxMD icon Read
search

Phase contrast Magnetic aortic

keyword
https://www.readbyqxmd.com/read/29772936/the-effect-of-supine-positioning-on-maternal-hemodynamics-during-late-pregnancy
#1
Aimee Humphries, S Ali Mirjalili, Gregory P Tarr, John M D Thompson, Peter Stone
INTRODUCTION: Recent studies have demonstrated an association between maternal supine sleep position and an increased risk of late stillbirth. During late pregnancy the gravid uterus compresses the inferior vena cava when a woman lies in the supine position. The azygos system of veins is the dominant pathway of collateral venous return back to the heart in the event of acute obstruction of the inferior vena cava. It is suggested that this pathway provides adequate collateral venous circulation in the event of inferior vena caval compression in the supine position during late pregnancy...
May 17, 2018: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29762918/impact-of-heart-rate-on-flow-measurements-in-aortic-regurgitation
#2
Mats Lidén, Maciej Wodecki, Per Thunberg, Peter Rask
BACKGROUND: Flow measurements using cardiac magnetic resonance imaging (CMRI) enable quantification of the stroke volume, regurgitant volume (RV) and regurgitant fraction (RF) in patients with aortic regurgitation (AR). These variables are used to assess the severity of the valve disease and for the timing of surgery. The aim of the study was to investigate the impact of an increased heart rate on measurement of the RV and RF in patients with AR. METHODS: Among 13 patients with known moderate or severe AR, regurgitant flow measurements, using phase-contrast cine magnetic resonance imaging, were obtained in the ascending aorta...
September 2017: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/29759739/aortic-valve-bypass-surgery-in-severe-aortic-valve-stenosis-insights-from-cardiac-and-brain-magnetic-resonance-imaging
#3
Cesare Mantini, Massimo Caulo, Daniele Marinelli, Piero Chiacchiaretta, Armando Tartaro, Antonio Raffaele Cotroneo, Gabriele Di Giammarco
OBJECTIVE: To investigate and describe the distribution of aortic and cerebral blood flow (CBF) in patients with severe valvular aortic stenosis (AS) before and after aortic valve bypass (AVB) surgery. METHODS: We enrolled 10 consecutive patients who underwent AVB surgery for severe AS. Cardiovascular magnetic resonance imaging (CMR) and brain magnetic resonance imaging were performed as baseline before surgery and twice after surgery. Quantitative flow measurements were obtained using 1...
April 13, 2018: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29730841/grading-of-aortic-stenosis-severity-a-head-to-head-comparison-between-cardiac-magnetic-resonance-imaging-and-echocardiography
#4
Cesare Mantini, Gabriele Di Giammarco, Jacopo Pizzicannella, Sabina Gallina, Fabrizio Ricci, Emilia D'Ugo, Marziale Marchetti, Antonio Raffaele Cotroneo, Nauman Ahmed, Chiara Bucciarelli-Ducci, Armando Tartaro, Raffaele De Caterina
AIM: To prospectively evaluate the accuracy of cardiac magnetic resonance (cMR) imaging for the assessment of aortic valve effective orifice area (EOA) by continuity equation and anatomical aortic valve area (AVA) by direct planimetry, as compared with transthoracic (TTE) and transesophageal (TEE) two-dimensional (2D) echocardiography, respectively. METHODS AND RESULTS: A total of 31 patients (21 men, 10 women, mean age 69 ± 10 years) with moderate-to-severe aortic stenosis (AS) diagnosed by TTE and scheduled for elective aortic valve replacement, underwent both cMR and TEE...
May 5, 2018: La Radiologia Medica
https://www.readbyqxmd.com/read/29717983/whole-heart-4d-flow-cardiac-magnetic-resonance-in-healthy-dogs
#5
N Pfammatter, I Campagna, M Baron Toaldo, E Bruellmann, H Richter, P Kircher, M Dennler
In cardiac magnetic resonance imaging (CMR), accurate flow measurements rely on perpendicular plane-alignment with flow direction. For 2D phase contrast (PC) cardiac magnetic resonance measurements, planes have to be defined during the examination of the heart, which is time consuming and error-prone. Collection of flow information of the entire volume of the heart by a 4D flow CMR postpones plane alignment to post-processing. Sampling of such a large amount of data requires acceleration of data acquisition with techniques such as SENSitivity Encoding (k-t SENSE) or Broad-use Linear Acquisition Speed-up Technique (k-t BLAST)...
May 2018: Schweizer Archiv Für Tierheilkunde
https://www.readbyqxmd.com/read/29684119/aortic-stiffness-in-adolescent-turner-and-marfan-syndrome-patients
#6
Michal Schäfer, Lorna P Browne, Uyen Truong, James J Jaggers, Max B Mitchell, Ladonna Malone, Gareth Morgan, Kathryn Chatfield, Daniel McLennan, Harma Turbendian, Danial Vargas, Brian Fonseca, Michael DiMaria, Anar Shah, Margaret P Ivy, Alex J Barker, Kendall S Hunter, Neil Wilson, D Dunbar Ivy, David N Campbell
OBJECTIVES: Turner syndrome (TS) and Marfan syndrome (MFS) are partially characterized by aortopathies with a risk of developing severe aortic dilation, stiffness and consequent dissection and aneurysm formation. The incidence of a bicuspid aortic valve (BAV) is also increased in TS. We investigated aortic stiffness in teenage TS and MFS patients and evaluated to what degree stiffness in TS patients is augmented by the presence of a BAV. METHODS: Fifty-seven patients with TS (n = 37) and MFS (n = 20), as well as 22 controls with similar age and size distribution underwent evaluation of thoracic aortic stiffness using phase-contrast magnetic resonance imaging...
April 19, 2018: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/29667078/impact-of-different-coarctation-therapies-on-aortic-stiffness-phase-contrast-mri-study
#7
Michal Schäfer, Gareth J Morgan, Max B Mitchell, Michael Ross, Alex J Barker, Kendall S Hunter, Brian Fonseca, Michael DiMaria, Daniel Vargas, D Dunbar Ivy, Neil Wilson, Lorna P Browne
Coarctation of the aorta has been associated with increased thoracic aortic stiffness in adolescents and young adults. However, the effects of different therapeutic strategies on aortic stiffness in a young population is unknown. This study aimed to non-invasively assess aortic stiffness between different repair or intervention strategies in patients with coarctation of the aorta. Forty-nine coarctation patients who underwent either surgery (n = 26), balloon angioplasty (n = 14), or stent implantation (n = 12), and 26 age- and size-matched normotensive healthy controls underwent evaluation of thoracic aortic stiffness and flow hemodynamics via phase-contrast cardiac magnetic resonance...
April 17, 2018: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/29629022/impact-of-a-geometric-correction-for-proximal-flow-constraint-on-the-assessment-of-mitral-regurgitation-severity-using-the-proximal-flow-convergence-method
#8
Jeong Yoon Jang, Joon-Won Kang, Dong Hyun Yang, Sahmin Lee, Byung Joo Sun, Dae-Hee Kim, Jong-Min Song, Duk-Hyun Kang, Jae-Kwan Song
Background: Overestimation of the severity of mitral regurgitation (MR) by the proximal isovelocity surface area (PISA) method has been reported. We sought to test whether angle correction (AC) of the constrained flow field is helpful to eliminate overestimation in patients with eccentric MR. Methods: In a total of 33 patients with MR due to prolapse or flail mitral valve, both echocardiography and cardiac magnetic resonance image (CMR) were performed to calculate regurgitant volume (RV)...
March 2018: Journal of Cardiovascular Ultrasound
https://www.readbyqxmd.com/read/29471444/relation-of-sex-hormone-levels-with-prevalent-and-10-year-change-in-aortic-distensibility-assessed-by-mri-the-multi-ethnic-study-of-atherosclerosis
#9
V Subramanya, B Ambale-Venkatesh, Y Ohyama, D Zhao, C C Nwabuo, W S Post, E Guallar, P Ouyang, S J Shah, M A Allison, C E Ndumele, D Vaidya, D A Bluemke, J A Lima, E D Michos
Background: Women experience a steeper decline in aortic elasticity related to aging compared to men. We examined whether sex hormone levels were associated with ascending aortic distensibility (AAD) in the Multi-Ethnic Study of Atherosclerosis. Methods: We studied 1,345 post-menopausal women and 1,532 men aged 45-84 years, who had serum sex hormone levels, AAD measured by phase-contrast cardiac magnetic resonance imaging, and ejection fraction>50% at baseline...
February 19, 2018: American Journal of Hypertension
https://www.readbyqxmd.com/read/29458384/cardiovascular-cine-imaging-and-flow-evaluation-using-fast-interrupted-steady-state-fiss-magnetic-resonance
#10
Robert R Edelman, Ali Serhal, Amit Pursnani, Jianing Pang, Ioannis Koktzoglou
BACKGROUND: Existing cine imaging techniques rely on balanced steady-state free precession (bSSFP) or spoiled gradient-echo readouts, each of which has limitations. For instance, with bSSFP, artifacts occur from rapid through-plane flow and off-resonance effects. We hypothesized that a prototype cine technique, radial fast interrupted steady-state (FISS), could overcome these limitations. The technique was compared with standard cine bSSFP for cardiac function, coronary artery conspicuity, and aortic valve morphology...
February 19, 2018: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/29455849/relationship-between-proximal-aorta-morphology-and-progression-rate-of-aortic-stenosis
#11
Romain Capoulade, Jonathan G Teoh, Philipp E Bartko, Eliza Teo, Jan-Erik Scholtz, Lionel Tastet, Mylene Shen, Christos G Mihos, Yong H Park, Julio Garcia, Eric Larose, Eric M Isselbacher, Thoralf M Sundt, Thomas E MacGillivray, Serguei Melnitchouk, Brian B Ghoshhajra, Philippe Pibarot, Judy Hung
BACKGROUND: The aim of this study was to examine the association between abnormal morphology of the proximal aorta and aortic stenosis (AS) progression rate. The main hypothesis was that morphologic changes of the proximal aorta, such as effacement of the sinotubular junction (STJ), result in increased biomechanical stresses and contribute to calcification and progression of AS. METHODS: Between 2010 and 2012, 426 patients with mild to moderate AS were included in this study...
May 2018: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/29451963/aortic-valve-stenosis-and-aortic-diameters-determine-the-extent-of-increased-wall-shear-stress-in-bicuspid-aortic-valve-disease
#12
Emile S Farag, Pim van Ooij, R Nils Planken, Kayleigh C P Dukker, Frederiek de Heer, Berto J Bouma, Danielle Robbers-Visser, Maarten Groenink, Aart J Nederveen, Bas A J M de Mol, Jolanda Kluin, S Matthijs Boekholdt
BACKGROUND: Use of 4-dimensional flow magnetic resonance imaging (4D-flow MRI) derived wall shear stress (WSS) heat maps enables identification of regions in the ascending aorta with increased WSS. These regions are subject to dysregulation of the extracellular matrix and elastic fiber degeneration, which is associated with aortic dilatation and dissection. PURPOSE: To evaluate the effect of the presence of aortic valve stenosis and the aortic diameter on the peak WSS and surface area of increased WSS in the ascending aorta...
February 16, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29362149/strain-of-ascending-aorta-on-cardiac-magnetic-resonance-in-1027-patients-relation-with-age-gender-and-cardiovascular-disease
#13
Marco Scarabello, Marina Codari, Francesco Secchi, Paola M Cannaò, Marco Alì, Giovanni Di Leo, Francesco Sardanelli
OBJECTIVES: To evaluate ascending aortic strain (AAS) with cardiac magnetic resonance (CMR) in a large consecutive series of patients with different types of cardiovascular disease (CVD). METHODS: Two-dimensional phase-contrast gradient-echo sequences of the ascending aorta were retrospectively reviewed in 1027 patients (726 males, 301 females). Aortic lumen area was segmented using a semi-automatic approach to calculate AAS values. Subgroup analysis was performed for patients with normal CMR, tetralogy of Fallot (ToF), and ischemic heart disease (IHD)...
February 2018: European Journal of Radiology
https://www.readbyqxmd.com/read/29334490/differential-impact-of-local-and-regional-aortic-stiffness-on-left-ventricular-remodeling-a-cardiovascular-magnetic-resonance-study
#14
Thiago Quinaglia, Mourad Z Bensalah, Emilie Bollache, Nadjia Kachenoura, Gilles Soulat, Pierre Boutouyrie, Stéphane Laurent, Elie Mousseaux
BACKGROUND: Left ventricular (LV) remodeling and aortic stiffness have independent predictive value for all causes and cardiovascular mortality. Because elastic properties of the arterial wall vary along the aortic pathway, we hypothesized that local and regional aortic stiffness could differently impact on LV remodeling. METHODS AND RESULTS: Regional aortic stiffness was determined from carotid-femoral pulse wave velocity (cfPWV) measured by aplanation tonometry...
March 2018: Journal of Hypertension
https://www.readbyqxmd.com/read/29290484/pulsed-wave-doppler-recordings-in-the-proximal-descending-aorta-in-patients-with-chronic-aortic-regurgitation-insights-from-cardiovascular-magnetic-resonance
#15
Odd Bech-Hanssen, Christian L Polte, Frida Svensson, Åse A Johnsson, Kerstin M Lagerstrand, Ulf Cederbom, Sinsia A Gao
BACKGROUND: The pulsed-wave Doppler recording in the descending aorta (PWDDAO ) is one of the parameters used in grading aortic regurgitation (AR) severity. The aim of the present study was to investigate the assessment of chronic AR by PWDDAO with insights from cardiovascular magnetic resonance (CMR). METHODS: This prospective study comprised 40 patients investigated with echocardiography and CMR within 4 hours either prior to valve surgery (n = 23) or as part of their follow-up (n = 17) due to moderate or severe AR...
March 2018: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/29279525/planimetry-of-the-orifice-area-in-aortic-valve-stenosis-using-phase-contrast-cardiac-magnetic-resonance-imaging
#16
COMPARATIVE STUDY
Hajime Abe, Nobuo Iguchi, Yuko Utanohara, Kaori Takada, Yasuki Hen, Haruhiko Machida, Norihiko Takeda, Tetsuya Sumiyoshi
Manual planimetry is a well-established method using transesophageal echocardiography (TEE) to assess the severity of aortic stenosis (AS). TEE, however, is a less than optimal approach in patients with calcified valves. Even when using cine-cardiac magnetic resonance (CMR), it is often difficult to evaluate the true border of the aortic orifice because of jet turbulence. With phase-contrast sequences of CMR, high flow signals at the aortic orifice can be clearly visualized, even in cases with severe calcification and jet turbulence...
January 27, 2018: International Heart Journal
https://www.readbyqxmd.com/read/29260346/assessment-of-mitral-regurgitation-by-3-dimensional-proximal-flow-convergence-using-magnetic-resonance-imaging-comparison-with-echo-doppler
#17
Lior Gorodisky, Yoram Agmon, Moshe Porat, Sobhi Abadi, Jonathan Lessick
To test the feasibility of assessing mitral regurgitation (MR) severity using cardiac magnetic resonance (CMR) 4D velocity vectors to quantify regurgitant volume (RVol) by analysis of the proximal flow convergence, compared to Doppler based proximal isovelocity surface area (PISA) and CMR volume-based methods. In a prospectively designed study, 27 patients with various grades of MR underwent CMR and echo-Doppler on the same day. By CMR, multiple slices were obtained parallel to the mitral valve by phase-contrast imaging, using 3D velocity vectors, as well as short-axis cine images for left and right ventricular volume measurements...
December 19, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/29247585/simultaneous-acquisition-of-mr-angiography-and-diagnostic-images-of-abdomen-at-view-sharing-multiarterial-phases-and-comparing-the-effect-of-two-different-contrast-agents
#18
Yoshifumi Noda, Satoshi Goshima, Tomohiro Namimoto, Norihiro Shinkawa, Masataka Nakagawa, Kimihiro Kajita, Hiroshi Kawada, Nobuyuki Kawai, Yukichi Tanahashi, Masayuki Matsuo, Kyongtae T Bae, Toshinori Hirai, Yasuyuki Yamashita
BACKGROUND: Simultaneous acquisition of magnetic resonance angiography (MRA) and diagnostic images is challenging in contrast-enhanced upper abdominal MRI. PURPOSE: To evaluate the image quality of MRA of the abdomen acquired simultaneously with diagnostic MR images, and to compare the contrast effect, conspicuity of aortic branches, and pancreatic lesions in MRA between gadobutrol and gadoterate meglumine. STUDY TYPE: Prospective. POPULATION: Eighty-eight patients with known and suspected upper abdominal disease...
December 16, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29193358/cardiovascular-magnetic-resonance-elastography-a-review
#19
Saad Khan, Faisal Fakhouri, Waqas Majeed, Arunark Kolipaka
Cardiovascular diseases are the leading cause of death worldwide. These cardiovascular diseases are associated with mechanical changes in the myocardium and aorta. It is known that stiffness is altered in many diseases, including the spectrum of ischemia, diastolic dysfunction, hypertension and hypertrophic cardiomyopathy. In addition, the stiffness of the aortic wall is altered in multiple diseases, including hypertension, coronary artery disease and aortic aneurysm formation. For example, in diastolic dysfunction in which the ejection fraction is preserved, stiffness can potentially be an important biomarker...
November 29, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/29193260/racer-grasp-respiratory-weighted-aortic-contrast-enhancement-guided-and-coil-unstreaking-golden-angle-radial-sparse-mri
#20
Li Feng, Chenchan Huang, Krishna Shanbhogue, Daniel K Sodickson, Hersh Chandarana, Ricardo Otazo
PURPOSE: To develop and evaluate a novel dynamic contrast-enhanced imaging technique called RACER-GRASP (Respiratory-weighted, Aortic Contrast Enhancement-guided and coil-unstReaking Golden-angle RAdial Sparse Parallel) MRI that extends GRASP to include automatic contrast bolus timing, respiratory motion compensation, and coil-weighted unstreaking for improved imaging performance in liver MRI. METHODS: In RACER-GRASP, aortic contrast enhancement (ACE) guided k-space sorting and respiratory-weighted sparse reconstruction are performed using aortic contrast enhancement and respiratory motion signals extracted directly from the acquired data...
November 28, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
keyword
keyword
112496
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"