scholarly journals A Bayesian approach for 4D flow imaging of aortic valve in a single breath‐hold

2018 ◽  
Vol 81 (2) ◽  
pp. 811-824 ◽  
Author(s):  
Adam Rich ◽  
Lee C. Potter ◽  
Ning Jin ◽  
Yingmin Liu ◽  
Orlando P. Simonetti ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Bayesian Approach ◽  
Breath Hold ◽  
Flow Imaging ◽  
4D Flow ◽  
Single Breath ◽  
Single Breath Hold ◽  
4D Flow Imaging

Aortic flow patterns in bicuspid aortic valve disease visualised with 4D flow imaging

2012 ◽  
Vol 97 (Suppl 1) ◽  
pp. A129.3-A130
Author(s):  
MM Gedicke ◽  
A Pitcher ◽  
A Barker ◽  
J Bock ◽  
R Lorenz ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Bicuspid Aortic Valve ◽  
Aortic Valve Disease ◽  
Flow Patterns ◽  
Aortic Flow ◽  
Valve Disease ◽  
Flow Imaging ◽  
4D Flow ◽  
4D Flow Imaging

scholarly journals Impaction of regurgitation jet on anterior mitral leaflet is associated with diastolic dysfunction in patients with bicuspid aortic valve and mild insufficiency: a cardiovascular magnetic resonance study

2021 ◽  
Author(s):  
Nicola Galea ◽  
Giacomo Pambianchi ◽  
Giulia Cundari ◽  
Francesco Sturla ◽  
Livia Marchitelli ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Aortic Valve ◽  
Bicuspid Aortic Valve ◽  
Left Ventricular ◽  
Control Group ◽  
Cardiovascular Magnetic Resonance Study ◽  
Flow Imaging ◽  
4D Flow ◽  
The Impact ◽  
4D Flow Imaging

AbstractTo assess the impact of regurgitant jet direction on left ventricular function and intraventricular hemodynamics in asymptomatic patients with bicuspid aortic valve (BAV) and mild aortic valve regurgitation (AR), using cardiac magnetic resonance (CMR) feature tracking and 4D flow imaging. Fifty BAV individuals were retrospectively selected: 15 with mild AR and posterior regurgitation jet (Group-PJ), 15 with regurgitant jet in other directions (Group-nPJ) and 20 with no regurgitation (Controls). CMR protocol included cine steady state free precession (SSFP) sequences and 4D Flow imaging covering the entire left ventricle (LV) cavity and the aortic root. Cine-SSFP images were analyzed to assess LV volumes, longitudinal and circumferential myocardial strain. Circumferential and longitudinal peak diastolic strain rate (PDSR) and peak diastolic velocity (PDV) were reduced in group PJ if compared to group nPJ and control group (PDSR = 1.10 ± 0.2 1/s vs. 1.34 ± 0.5 1/s vs. 1.53 ± 0.3 1/s, p:0.001 and 0.68 ± 0.2 1/s vs. 1.17 ± 0.2 1/s vs. 1.05 ± 0.4 1/s ; p < 0.001, PDV = − 101.6 ± 28.1 deg/s vs. − 201.4 ± 85.9 deg/s vs. − 221.6 ± 67.1 deg/s; p < 0.001 and − 28.1 ± 8 mm/s vs. − 38.9 ± 11.1 mm/s vs. − 43.6 ± 14.3 mm/s, p < 0.001, respectively), whereas no differences have been found in systolic strain values. 4D Flow images (available only in 9 patients) showed deformation of diastolic transmitral streamlines direction in group PJ compared to other groups. In BAV patients with mild AR, the posterior direction of the regurgitant jet may hamper the complete mitral valve opening, disturbing transmitral flow and slowing the LV diastolic filling.

scholarly journals Impaction of Regurgitation Jet on Anterior Mitral Leaflet Causes Diastolic Dysfunction in Patients With Bicuspid Aortic Valve and Mild Insufficiency: A Cardiovascular Magnetic Resonance Study

2021 ◽  
Author(s):  
Nicola Galea ◽  
Giacomo Pambianchi ◽  
Giulia Cundari ◽  
Francesco Sturla ◽  
Livia Marchitelli ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Aortic Valve ◽  
Bicuspid Aortic Valve ◽  
Left Ventricular ◽  
Control Group ◽  
Cardiovascular Magnetic Resonance Study ◽  
Flow Imaging ◽  
4D Flow ◽  
The Impact ◽  
4D Flow Imaging

Abstract Purpose: To assess the impact of regurgitant jet direction on left ventricular function and intraventricular hemodynamics in asymptomatic patients with bicuspid aortic valve (BAV) and mild aortic valve regurgitation (AR), using cardiac magnetic resonance (CMR) feature tracking and 4D flow imaging.Methods: Fifty BAV individuals were retrospectively selected: 15 with mild AR and posterior regurgitation jet (Group-PJ), 15 with regurgitant jet in other directions (Group-nPJ) and 20 with no regurgitation (Controls). CMR protocol included cine steady state free precession (SSFP) sequences and 4D Flow imaging covering the entire left ventricle (LV) cavity and the aortic root. Cine-SSFP images were analyzed to assess LV volumes, longitudinal and circumferential myocardial strain.Results: Circumferential and longitudinal peak diastolic strain rate (PDSR) and peak diastolic velocity (PDV) were reduced in group PJ if compared to group nPJ and control group (PDSR = 1.10±0.2 s-1 vs 1.34±0.5 s-1 vs 1.53±0.3 s-1 , p:0.001 and 0.68±0.2 s-1 vs 1.17±0.2 s-1 vs 1.05±0.4 s-1 ; p<0.001, PDV = -101.6±28.1 deg/s vs -201.4±85.9 deg/s vs - 221.6±67.1 deg/s; p<0.001 and -28.1±8 mm/s vs -38.9±11.1 mm/s vs -43.6±14.3 mm/s, p<0.001, respectively), whereas no differences have been found in systolic strain values. 4D Flow images (available only in 9 patients) showed deformation of diastolic transmitral streamlines direction in group PJ compared to other groups.Conclusion: In BAV patients with AR, the posterior direction of the regurgitant jet may hamper the complete mitral valve opening, disturbing transmitral flow and slowing the LV diastolic filling

Single-breath-hold venous or arterial flow-suppressed pulmonary vascular MR imaging with phased-array coils

1993 ◽  
Vol 3 (4) ◽  
pp. 611-616 ◽  
Author(s):  
Thomas K. F. Foo ◽  
James R. Macfall ◽  
H. Dirk Sostman ◽  
Cecil E. Hayes
Keyword(s):  
Mr Imaging ◽  
Phased Array ◽  
Arterial Flow ◽  
Breath Hold ◽  
Single Breath ◽  
Single Breath Hold ◽  
Phased Array Coils ◽  
Array Coils

scholarly journals Quantitative single breath-hold renal arterial spin labeling imaging at 7T

2017 ◽  
Vol 79 (2) ◽  
pp. 815-825 ◽  
Author(s):  
Xiufeng Li ◽  
Edward J. Auerbach ◽  
Pierre-Francois Van de Moortele ◽  
Kamil Ugurbil ◽  
Gregory J. Metzger
Keyword(s):  
Arterial Spin Labeling ◽  
Spin Labeling ◽  
Breath Hold ◽  
Single Breath ◽  
Single Breath Hold

Changing effect of lung volume on respiratory drive in man

1975 ◽  
Vol 38 (5) ◽  
pp. 768-773 ◽  
Author(s):  
N. N. Stanley ◽  
M. D. Altose ◽  
S. G. Kelsen ◽  
C. F. Ward ◽  
N. S. Cherniack
Keyword(s):  
Human Subjects ◽  
Inhibitory Effect ◽  
Breath Holding ◽  
Breath Hold ◽  
Respiratory Drive ◽  
Lung Inflation ◽  
Single Breath ◽  
Single Breath Hold ◽  
Sustained Effect ◽  
Residual Capacity

Experiments were conducted on human subjects to study the effect of lung inflation during breath holding on respiratory drive. Two series of experiments were performed: the first to examine respiratory drive during a single breath hold, the second designed to examine the sustained effect of lung inflation on subsequent breath holds. The experiments involved breath holding begun either at the end of a normal expiration or after a maximum inspiration. When breath holding was repeated at 10-min intervals, the increase in BHT produced by lung inflation was greater in short breath holds (after CO2 rebreathing) than in long breath holds (after hyperventilation). If breath holds were made in rapid succession, the first breath hold was much longer when made at total lung capacity than at functional residual capacity, but this effect of lung inflation diminished in subsequent breath holds. It is concluded that the inhibitory effect of lung inflation decays during breath holding and is regained remarkably slowly during the period of breathing immediately after breath holding.

scholarly journals Single breath-hold 3D cardiac T 1 mapping using through-time spiral GRAPPA

2018 ◽  
Vol 31 (6) ◽  
pp. e3923 ◽  
Author(s):  
Yong Chen ◽  
Wei-Ching Lo ◽  
Jesse I. Hamilton ◽  
Kestutis Barkauskas ◽  
Haris Saybasili ◽  
...  
Keyword(s):  
Breath Hold ◽  
Single Breath ◽  
Single Breath Hold
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