Results 61 to 70 of about 2,011,937 (232)
Physiological Reports, 2021 We explored the use of the augmentation index (AI) based on pulse wave analysis (PWA) in the pulmonary circulation as a measure of wave reflection and arterial stiffness in individuals with and without pulmonary arterial hypertension (PAH) and chronic ...
Junjing Su +5 more
doaj +1 more source
Determination of wave intensity in flexible tubes using measured diameter and velocity [PDF]
, 2007 Wave intensity (WI) is a hemodynamics index, which is the product of changes in pressure and velocity across the wave-front. Wave Intensity Analysis, which is a time domain technique allows for the separation of running waves into their forward and ...
Feng, J, Khir, AW
core +1 more source
Frontiers in Physiology, 2020 Increased wave reflection is an independent predictor of cardiovascular events, possibly due to effects on left ventricular (LV) function. We investigated the relationship between reflected waves in early systole, the forward decompression wave in mid ...
Chloe M. Park +5 more
doaj +1 more source
Wave energy patterns of counterpulsation: A novel approach with wave intensity analysis [PDF]
The Journal of Thoracic and Cardiovascular Surgery, 2011 In counterpulsation, diastolic augmentation increases coronary blood flow and systolic unloading reduces left ventricular afterload. We present a new approach with wave intensity analysis to revisit and explain counterpulsation principles.In an acute porcine model, a standard intra-aortic balloon pump was placed in descending aorta in 4 pigs.
Lu, Pong-Jeu +5 more
openaire +2 more sources
Journal of the American Heart Association: Cardiovascular and Cerebrovascular Disease, 2018 Background Cold air inhalation during exercise increases cardiac mortality, but the pathophysiology is unclear. During cold and exercise, dual‐sensor intracoronary wires measured coronary microvascular resistance (MVR) and blood flow velocity (CBF), and ...
Rupert P. Williams +17 more
doaj +1 more source
Simultaneous determination of wave speed and arrival time of reflected waves using the pressure-velocity loop [PDF]
, 2007 This is the post print version of the article. The official published version can be found at the link below.In a previous paper we demonstrated that the linear portion of the pressure–velocity loop (PU-loop) corresponding to early systole could be used ...
A Harada +33 more
core +1 more source
From single particle to superfuid excitations in a dissipative polariton gas [PDF]
, 2011 Using angle-resolved heterodyne four-wave-mixing technique, we probe the low momentum excitation spectrum of a coherent polariton gas. The experimental results are well captured by the Bogoliubov transformation which describes the transition from single ...
B. Deveaud-Plédran +7 more
core +5 more sources
Polarization coupling and pattern selection in a type-II optical parametric oscillator [PDF]
, 2001 We study the role of a direct intracavity polarization coupling in the dynamics of transverse pattern formation in type-II optical parametric oscillators.
A. Amengual +37 more
core +2 more sources
Modulation of chorus intensity by ULF waves deep in the inner magnetosphere [PDF]
, 2016 Previous studies have shown that chorus wave intensity can be modulated by Pc4-Pc5 compressional ULF waves. In this study, we present Van Allen Probes observation of ULF wave modulating chorus wave intensity, which occurred deep in the magnetosphere. The
Chan, Anthony A. +6 more
core +1 more source
Wavelength-scale stationary-wave integrated Fourier-transform spectrometry [PDF]
, 2007 Spectrometry is a general physical-analysis approach for investigating light-matter interactions. However, the complex designs of existing spectrometers render them resistant to simplification and miniaturization, both of which are vital for applications
A Bruyant +28 more
core +4 more sources