Results 91 to 100 of about 7,220,590 (185)

Wave separation, wave intensity, the reservoir-wave concept, and the instantaneous wave-free ratio presumptions and principles

, 2015
Wave separation analysis and wave intensity analysis (WIA) use (aortic) pressure and flow to separate them in their forward and backward (reflected) waves.
Westerhof, B.E., Westerhof, Berend E., Segers, P., Westerhof, Nico, Segers, Patrick, Westerhof, N.   +5 more
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Novel Assessment of Ischemia in Patients With Anomalous Right Coronary Artery

JACC: Case Reports, 2019
Anomalous right coronary arteries are usually benign; however, sudden death owing to myocardial ischemia, especially during exertion, have been reported in patients with intramural or interarterial course, which is likely due to dynamic obstruction.
Lerin C. McCray, MD, Delvise T. Fogwe, BSN, Kul Aggarwal, MD, Poorna R. Karuparthi, MD   +3 more
doaj   +1 more source

TCTAP C-215 Instantaneous Wave-Free Ratio(iFR) Guided PCI on Decision-Making at the End of PCI for Tandem Lesion

Journal of the American College of Cardiology, 2015
### Patient initials or identifier number M.K. ### Relevant clinical history and physical exam A 86-year-old man, who has a history of hypertension and cerebral infarction, presented with increasing frequency and severity of chest discomfort over the past week.
openaire   +1 more source

The Evolving Future of Instantaneous Wave-Free Ratio and Fractional Flow Reserve

, 2017
In this review, the authors reflect upon the role of coronary physiology in the modern management of coronary artery disease. They critically appraise the scientific background of the instantaneous wave-free ratio (iFR) and fractional flow reserve (FFR),
Matthias Götberg, Davies, Justin E., Sayan Sen, Cook, Christopher M., Cook, Christopher M.,, Escaned, Javier, Nijjer, Sukhjinder, Götberg, Matthias, Javier Escaned, Justin E. Davies, Sen, Sayan,, Christopher M. Cook, Sen, Sayan, Escaned, Javier,, Sukhjinder Nijjer, Götberg, Matthias,, Nijjer, Sukhjinder,, Lund University., Davies, Justin E.,   +18 more
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Does the instantaneous wave-free ratio approximate the fractional flow reserve? [PDF]

, 2013
Objectives This study sought to examine the clinical performance of and theoretical basis for the instantaneous wave-free ratio (iFR) approximation to the fractional flow reserve (FFR).
Fearon, William F, Kirkeeide, R.L., Redwood, SR, Maria Siebes, Marques, K.M.J., Spaan, JAE Jos, Gould, K Lance, van 't Veer, Marcel, Rolandi, MC, Bernard De Bruyne, Johnson, Nils P., William F. Fearon, Veer, van 't, M.; id_orcid, Johnson, N.P., Spaan, Jos A. E., Pijls, Nico H. J., Jan J. Piek, Lockie, Timothy, Asrress, K.N., Fearon, W.F., Pyxaras, S.A., Spaan, J. A. E., Jos A.E. Spaan, Pijls, NHJ Nico, Piek, JJ, Rolandi, M., Bruyne, Bernard De, Siebes, Maria, Pijls, N.H.J., Veer, van 't, M., De Bruyne, Bernard, Redwood, S., Simon Redwood, Marcel van 't Veer, Fearon, William F., De Bruyne, B., M. Cristina Rolandi, Asrress, KN, Rolandi, M. Cristina, Bruyne, de, B., Marques, Koen M. J., Johnson, NP, Nils P. Johnson, Kirkeeide, Richard L., van de Veer, M., Gould, K.L., Timothy Lockie, Lockie, T, Piek, Jan J., Kirkeeide, Richard L, Pijls, Nico H.J., Marques, KMJ, Kaleab N. Asrress, Veer, M Marcel van 't, Pyxaras, Stylianos A., Pyxaras, SA, Redwood, Simon, Koen M.J. Marques, Spaan, J.A.E., Siebes, M, Pijls, N.H., Siebes, M., Piek, J.J., Gould, K., Lockie, T., Nico H.J. Pijls, Redwood, S.R., Asrress, Kaleab N., Marques, Koen M.J., Spaan, Jos A.E., Richard L. Kirkeeide, Stylianos A. Pyxaras, Gould, K. Lance, Johnson, Nils P, K. Lance Gould   +74 more
core   +1 more source

Computational Analysis of Hemodynamic Indices in Multivessel Coronary Artery Disease in the Presence of Myocardial Perfusion Dysfunction

Computation
Coronary artery disease (CAD) is one of the main causes of death in the world. Functional indices such as fractional flow reserve (FFR), coronary flow reserve (CFR) and instantaneous wave-free ratio (iFR) are used to estimate the severity of CAD ...
Timur Gamilov, Alexander Danilov, Peter Chomakhidze, Philipp Kopylov, Sergey Simakov   +4 more
doaj   +1 more source

FRACTIONAL FLOW RESERVE BUT NOT INSTANTANEOUS WAVE-FREE RATIO DETECTS PLAQUE VULNERABILITY

, 2018
Background: Fractional fow reserve (FFR) is, next to lesion severity, affected by plaque vulnerability as assessed by coronary computed tomography angiography (CCTA) and associated with imminent acute coronary syndromes.
Pieter Raijmakers, van Rossum, Albert, Jonathon Leipsic, Roel Driessen, van de Ven, Peter, Stuijfzand, Wijnand, Danad, Ibrahim, Narula, Jagat, Amir Ahmadi, Leipsic, Jonathon, Min, James K., Albert van Rossum, Peter van de Ven, Wijnand Stuijfzand, Driessen, Roel, Paul Knaapen, Raijmakers, Pieter, Knaapen, Paul, Ibrahim Danad, James K. Min, Jagat Narula, Ahmadi, Amir   +21 more
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Fractional Flow Reserve Relates Stronger to Coronary Plaque Burden Than Nonhyperemic Pressure Indexes

Journal of the American Heart Association: Cardiovascular and Cerebrovascular Disease
Background The relationship between fractional flow reserve (FFR), resting full‐cycle ratio (RFR), instantaneous wave‐free ratio (iFR), resting distal pressure/aortic pressure (Pd/Pa), and plaque burden as well as phenotype requires further elucidation ...
Ruurt A. Jukema, Jorge Dahdal, Nick S. Nurmohamed, Pieter G. Raijmakers, Jos Twisk, Pepijn A. van Diemen, R. Nils Planken, G. Aernout Somsen, Niels J. Verouden, Guus A. de Waard, Paul Knaapen, Ibrahim Danad, Roel Driessen   +12 more
doaj   +1 more source

INSTANTANEOUS WAVE-FREE RATIO SCOUT PULLBACK (IFR SCOUT) PRE-ANGIOPLASTY PREDICTS HEMODYNAMIC OUTCOME IN HUMANS WITH CORONARY ARTERY DISEASE: PRIMARY RESULTS OF INTERNATIONAL MULTICENTRE IFR GRADIENT REGISTRY

Journal of the American College of Cardiology, 2017
Background: In tandem and diffuse disease, offline analysis of continuous instantaneous wave-free ratio (iFR) pullback measurement has been demonstrated to accurately predict the physiological outcome of revascularization. However, the accuracy of the real-time online analysis approach (iFR Scout)
Christopher Cook, Yuetsu Kikuta, Andrew Sharp, Pablo Salinas, Masafumi Nakayama, Gilbert Wijntjens, Sayan Sen, Ricardo Petraco da Cunha, Rasha Al-Lamee, Sukhjinder Nijjer, Atsushi Mizuno, Martin Mates, Luc Janssens, Farrel Hellig, Kazunori Horie, John Davies, Masahiro Yamawaki, Thomas Keeble, Flavio Ribichini, Ciro Indotfi, Jan Piek, Carlo Di Mario, Javier Escaned, Hitoshi Matsuo, Justin Davies   +24 more
openaire   +1 more source

Predictors of discordance between fractional flow reserve and instantaneous wave-free ratio in the real world

Journal of the Saudi Heart Association, 2018
Introduction: Invasive physiologic variables such as fractional flow reserve (FFR) and instantaneous wave-free ratio (iFR) are used in clinical practice to assess the functional significance of epicardial coronary stenosis and guide the management ...
Dikra Al-Dobai, Mohammad Balghith, Kamal Ayoub, Amira Enezi, Azra Mahmud, Ali AL Ghamdi   +5 more
doaj   +1 more source