Results 51 to 60 of about 48,338 (205)

Predictors of worsening TR severity after right ventricular lead placement: any added value by post-procedural fluoroscopy versus three –dimensional echocardiography?

Cardiovascular Ultrasound, 2021
Background The effect of right ventricular (RV) leads on tricuspid valve has been already raised concerns, especially in terms of prognostic implication.
Hoorak Poorzand, Mohammad Tayyebi, Sara Hosseini, Alireza Heidari Bakavoli, Faeze Keihanian, Lida Jarahi, Ali Hamadanchi   +6 more
doaj   +1 more source

Effects of afterload reduction on vena contracta width in mitral regurgitation

Journal of the American College of Cardiology, 1998
We used color Doppler flow mapping to determine whether vena contracta width (VCW) is a load-independent measure of the severity of mitral regurgitation.VCW has been proposed to be a relatively load-independent measure of mitral regurgitation severity in flow models using a fixed orifice.
Kizilbash, Ali M., Willett, DuWayne L., Brickner, M.Elizabeth, Heinle, Sheila K., Grayburn, Paul A.   +4 more
openaire   +2 more sources

Molecular phylogeny, biogeography, and taxonomy of Afro‐alpine Poa species of sub‐Saharan Africa and Madagascar

TAXON, Volume 75, Issue 5, October 2026.
Abstract We conducted phylogenetic analyses of Poa focused on Afro‐alpine species from sub‐Saharan Africa and Madagascar. We analyzed three plastid regions (matK, trnC‐rpoB, trnT‐trnL‐trnF) and two nuclear ribosomal (nr) regions (ITS, ETS) for 194 samples and 117 species of Poa. We present new DNA data for 93 samples, including 33 samples of seven Afro‐
Lynn J. Gillespie, Paul M. Peterson, Steven P. Sylvester, Roger D. Bull, Robert J. Soreng   +4 more
wiley   +1 more source

Boil-Off Gas Generation in Vacuum-Jacketed Valve Used in Liquid Hydrogen Storage Tank

Energies
The boiling point of liquid hydrogen is very low, at −253 °C under atmospheric pressure, which causes boil-off gas (BOG) to occur during storage and transport due to heat penetration.
Hae-Seong Hwang, Seong-Un Woo, Seung-Ho Han   +2 more
doaj   +1 more source

Experimental Imaging of Supercritical Discharge of Bubbles in a Liquid Jet [PDF]

MATEC Web of Conferences
Primary breakup in twin-fluid internal mixing atomisers is governed by the intermittent passage of gas–liquid structures through the discharge orifice; yet, the instability mechanisms at the orifice remain insufficiently characterised at the relevant ...
Novosad Pavel, Hajek Jiri, Maly Milan, Jedelsky Jan   +3 more
doaj   +1 more source

Assessment of Severity of Aortic Regurgitation Using the Width of the Vena Contracta [PDF]

Circulation, 2000
Background —The width of the vena contracta (VC-W), the smallest area of regurgitant flow, reflects the degree of valvular regurgitation and is measurable by color Doppler imaging, but this method has not been validated in aortic regurgitation (AR).
C M, Tribouilloy, M, Enriquez-Sarano, K R, Bailey, J B, Seward, A J, Tajik   +4 more
openaire   +2 more sources

Effects of changing blood viscosity and heart rate on vena contracta width as evaluated by color Doppler flow mapping. An in vitro study with a pulsatile flow model

, 2008
Background: There is only limited knowledge on how the quantification of valvular regurgitation by color Doppler is affected by changing blood viscosity.
GALLO- JR., Lourenco, Antônio Pazin‐Filho, SILVA JR., Telemaco da, MACIEL, Benedito Carlos, André Schmidt, MARIN-NETO, Jose Antonio, José Antonio Marin‐Neto, ALMEIDA-FILHO, Oswaldo Cesar, Luiz Otávio Murta Júnior, Oswaldo César Almeida‐Filho, Lourenço Gallo‐Júnior, PAZIN-FILHO, Antonio, Telêmaco Da Silva Júnior, Benedito Carlos Maciel, SCHMIDT, Andre, MURTA JR., Luiz Otavio   +15 more
core   +1 more source

A Review of Flow Field and Heat Transfer Characteristics of Jet Impingement From Special‐Shaped Holes

Engineering Reports, Volume 8, Issue 9, September 2026.
Special‐shaped nozzles and nanofluid integration enhance jet impingement cooling by improving heat transfer and thermal uniformity. However, gains are constrained by increased pressure drop and stability challenges, highlighting the need for optimized designs and multiscale modeling to achieve efficient, scalable thermal management.
Md Atiqur Rahman, Savinay Kalluri, Kalakoti Madhurya, Katikarla Arun Kumar, Abhinav Adarsh, S. M. Mozammil Hasnain, Prabhu Paramasivam, Leliso Hobicho Dabelo   +7 more
wiley   +1 more source

Tricuspid annular dynamics, not diameter, predicts tricuspid regurgitation after mitral valve surgery: Results from a prospective randomized trialCentral MessagePerspective

JTCVS Open, 2023
Objective: Current guidelines advise using prophylactic tricuspid valve annuloplasty during mitral valve surgery, especially in the presence of annular diameter enlargement.
Matteo Pettinari, MD, Laurent De Kerchove, MD, PhD, Michel Van Dyck, PhD, Agnes Pasquet, MD, PhD, Bernhard Gerber, MD, PhD, Gebrine El-Khoury, MD, Jean-Louis Vanoverschelde, MD, PhD   +6 more
doaj   +1 more source

Experimental and Numerical Study on the Improvement of Uniformity Flow in a Parallel Flow Channel [PDF]

Engineering and Technology Journal, 2016
The flow uniformity among individual branches within a manifold system can be a significant factor to predict the performance and efficiency of various engineering applications.
Wissam H. Alawee, Jafar M. Hassan, Wahid S. Mohammad   +2 more
doaj   +1 more source