Results 11 to 20 of about 229,628 (276)

Potential and limitations of wave intensity analysis in coronary arteries [PDF]

Medical & Biological Engineering & Computing, 2009
Wave intensity analysis (WIA) is beginning to be applied to the coronary circulation both to better understand coronary physiology and as a diagnostic tool. Separation of wave intensity (WI) into forward and backward traveling components requires knowledge of pulse wave velocity at the point of measurement, which at present cannot accurately be ...
Maria Siebes, Christina Kolyva, Bart-Jan Verhoeff, Jan J. Piek, Jos A. E. Spaan   +4 more
core   +7 more sources

Pulmonary artery wave intensity analysis in pulmonary hypertension associated with heart failure and reduced left ventricular ejection fraction [PDF]

Pulmonary Circulation
Wave intensity analysis (WIA) uses simultaneous changes in pressure and flow velocity to determine wave energy, type, and timing of traveling waves in the circulation.
Ivan H. W. Yim, Kim H. Parker, Nigel E. Drury, Hoong Sern Lim   +3 more
doaj   +2 more sources

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, Yang, Chi-Fu Jeffrey, Wu, Meng-Yu, Hung, Chun-Hao, Chan, Ming-Yao, Hsu, Tzu-Cheng   +5 more
openaire   +4 more sources

Wave intensity analysis and its application to the coronary circulation. [PDF]

Glob Cardiol Sci Pract, 2017
Wave intensity analysis (WIA) is a technique developed from the field of gas dynamics that is now being applied to assess cardiovascular physiology. It allows quantification of the forces acting to alter flow and pressure within a fluid system, and as such it is highly insightful in ascribing cause to dynamic blood pressure or velocity changes.When co ...
Broyd CJ, Davies JE, Escaned JE, Hughes A, Parker K.   +4 more
europepmc   +7 more sources

A review of wave mechanics in the pulmonary artery with an emphasis on wave intensity analysis. [PDF]

Acta Physiol (Oxf), 2016
AbstractMean pulmonary arterial pressure and pulmonary vascular resistance (PVR) remain the most common haemodynamic measures to evaluate the severity and prognosis of pulmonary hypertension. However, PVR only captures the non‐oscillatory component of the right ventricular hydraulic load and neglects the dynamic compliance of the pulmonary arteries and
Su J, Hilberg O, Howard L, Simonsen U, Hughes AD.   +4 more
europepmc   +7 more sources

A new approach to investigate wave dissipation in viscoelastic tubes: application of Wave Intensity Analysis [PDF]

2005 IEEE Engineering in Medicine and Biology 27th Annual Conference, 2005
Wave dissipation in elastic and viscoelastic medium has been investigated extensively in the frequency domain. The aim of this study is to examine the pattern of wave dissipation in the time-domain using Wave Intensity Analysis. A single semi-sinusoidal pulse was generated in 8mm and 16mm diameter tubes; each is of 200cm in length.
Feng, J, Khir, AW
openaire   +4 more sources

Wave intensity analysis with exercise identifies impairments in pulmonary hypertension. [PDF]

Am J Physiol Heart Circ Physiol
Wave intensity analysis (WIA) during exercise reveals distinct ventricle-/vessel-specific impairments across PH phenotypes. Cpc-PH exhibited highest forward and backward compression waves, reflecting elevated RV energy expenditure and pulmonary vascular stiffness, respectively.
Lechuga CG, Raza F, Colebank MJ, Korcarz CE, Eickhoff JC, Chesler NC.   +5 more
europepmc   +3 more sources

Feasibility of Estimation of Aortic Wave Intensity Using Non-invasive Pressure Recordings in the Absence of Flow Velocity in Man

Frontiers in Physiology, 2020
BackgroundWave intensity analysis provides valuable information on ventriculo-arterial function, hemodynamics, and energy transfer in the arterial circulation. Widespread use of wave intensity analysis is limited by the need for concurrent measurement of
Alun D. Hughes, Chloe Park, Anenta Ramakrishnan, Anenta Ramakrishnan, Jamil Mayet, Nish Chaturvedi, Kim H. Parker   +6 more
doaj   +3 more sources

Pulmonary wave intensity analysis to assess ventriculo-arterial interactions in cardiogenic shock [PDF]

JHLT Open
Background: Pulmonary wave intensity analysis (WIA) uses pressure and velocity measurements to characterize the type, direction, and timing of energy waves within the pulmonary circulation.
Sara L. Hungerford, MD, PhD, Kay D. Everett, MD, PhD, Edmund Lau, MD, PhD, Daniel Burkhoff, MD, PhD, Navin K. Kapur, MD, Gaurav Gulati, MD, PhD   +5 more
doaj   +2 more sources

Novel wave intensity analysis of arterial pulse wave propagation accounting for peripheral reflections [PDF]

International Journal for Numerical Methods in Biomedical Engineering, 2013
SUMMARYWe present a novel analysis of arterial pulse wave propagation that combines traditional wave intensity analysis with identification of Windkessel pressures to account for the effect on the pressure waveform of peripheral wave reflections.
Alastruey, Jordi, Hunt, Anthony A. E., Weinberg, Peter D.   +2 more
openaire   +7 more sources