Results 61 to 70 of about 7,220,590 (185)

Counting Degrees of Freedom: A Method Applicable From Scalars to f(Q)$f(\mathbb {Q})$ Gravity and Beyond

Fortschritte der Physik, Volume 74, Issue 6, June 2026.
ABSTRACT We present a clear, step‐by‐step method for counting degrees of freedom and identifying constraints in general field theories. This approach, grounded in the works of Einstein, Hilbert, Cartan, Kuranishi, and, more recently, Seiler, is neither Lagrangian nor Hamiltonian in nature. Instead, it applies directly to the field equations. We offer a
Lavinia Heisenberg
wiley   +1 more source

Data from: Diastolic pressure ratio: new approach and validation vs. the instantaneous wave-free ratio

, 2019
Aims The instantaneous wave-free ratio (iFR) and whole-cycle Pd/Pa investigate coronary physiology during non-hyperaemic conditions. To test for unique physiologic properties of the wave-free period when making resting coronary pressure ...
Nils P Johnson (3314277), Johnson, Nils P   +1 more
core   +1 more source

Hemodynamic Interference of Serial Stenoses and Its Impact on FFR and iFR Measurements

Applied Sciences, 2019
The hemodynamic interference of serial stenoses poses challenges for identifying the functional severity using the fractional flow reserve (FFR) method.
Siyeong Ju, Linxia Gu
doaj   +1 more source

Diastolic pressure ratio: new approach and validation vs. the instantaneous wave-free ratio

, 2019
Aims: The instantaneous wave-free ratio (iFR) and whole-cycle Pd/Pa investigate coronary physiology during non-hyperaemic conditions. To test for unique physiologic properties of the wave-free period when making resting coronary pressure measurements, we
Hennigan, Barry, Chen, Xi, Oldroyd, Keith G., Li, Wenguang, Johnson, Nils P., Watkins, Stuart, Fearon, William F., Berry, Colin   +7 more
core   +1 more source

Clinical Impact of Concordant and Discordant Physiology Parameters Post‐Percutaneous Coronary Intervention in the EASY‐PREDICT Study

Catheterization and Cardiovascular Interventions, Volume 106, Issue 7, Page 3867-3875, December 1, 2025.
ABSTRACT Background In the EASY‐PREDICT Study, patients were randomized to angiography‐guidance or post‐percutaneous coronary intervention (PCI) physiology‐guidance. Discordance between resting and hyperemic physiology post‐PCI might have a different relationship with clinical outcomes.
Paola Ulacia Flores, Tomas Cieza, Safia Ouarrak, Andrés Ruhl, Siddhartha Mengi, Robert De Larochellière, David Garcia‐Labbé, Jean‐Pierre Déry, Anthony Poulin, Éric Larose, Bernard Noël, Can Manh Nguyen, Jean‐Michel Paradis, Olivier F. Bertrand   +13 more
wiley   +1 more source

Impact of Epicardial plaQUe Composition and geomeTry on Coronary hEmodynamics and Flow in Patients With Coronary Artery Disease (iEquate)

Catheterization and Cardiovascular Interventions, Volume 106, Issue 5, Page 3034-3046, November 1, 2025.
ABSTRACT Background Invasive coronary physiology including fractional flow reserve (FFR), instantaneous wave‐free ratio (iFR), and coronary flow reserve (CFR) are guideline‐endorsed tools to guide the management of coronary artery disease (CAD). Complex factors impact and confound these assessments, and discordance between modalities complicates ...
Avedis Ekmejian, Usaid Allahwala, Rahul Bahl, Sayan Sen, Ricardo Petraco, Michael Ward, Ravinay Bhindi   +6 more
wiley   +1 more source

Comparison of Current and Novel ECG-Independent Algorithms for Resting Pressure Derived Physiologic Indices

IEEE Access, 2019
Recently, instantaneous wave-free ratio (iFR) or diastolic pressure-ratio (dPR) have been used in practice. For these indices, the reliability of electrocardiography (ECG)-independent algorithm for pressure-only data is essential.
Ki Hong Choi, Jinhyoung Park, Joo Myung Lee, Taewon Choi, Young Bin Song, Joo-Yong Hahn, Chang-Wook Nam, Eun-Seok Shin, Joon-Hyung Doh, Seung-Ho Hur, Bon-Kwon Koo   +10 more
doaj   +1 more source

Coronary Microvascular Dysfunction Alters the Pulsatile Behavior of the Resting Coronary Blood Flow

Microcirculation, Volume 32, Issue 6, August 2025.
ABSTRACT Background Variations in resting pulsatile coronary flow velocity acceleration/deceleration characteristics (dU/dt) with respect to epicardial lesions and coronary microvascular dysfunction (CMD) remain incompletely understood. Method The coronary dU/dt pattern was extracted from the first derivative of the intracoronary Doppler velocity ...
Ahmet Tas, Yaren Alan, Ilke Kara Tas, Omer E. Aydin, Zeynep Atay, Sule Yilmaz, Alp Ozcan, Tim P. van de Hoef, Sabahattin Umman, Jan J. Piek, Murat Sezer   +10 more
wiley   +1 more source

Multi‐Modality Imaging in Coronary Anomalies: Focus on Anomalous Aortic Origin of Coronary Arteries

Echocardiography, Volume 42, Issue 6, June 2025.
The study of anomalous coronary arteries involves a multidisciplinary evaluation, primarily focusing on echocardiographic assessment. It then requires confirmation with coronary CT angiography, and in doubtful cases, invasive methods like angiography may be necessary.
Guglielmo Capponi, Biagio Castaldi, Domenico Sirico, Elena Reffo, Nadia Assanta, Giuseppe Santoro, Francesco Prati, Alice Pozza, Massimiliano Cantinotti, Giovanni Di Salvo   +9 more
wiley   +1 more source

Objective Identification of Intermediate Lesions Inducing Myocardial Ischemia Using Sequential Intracoronary Pressure and Flow Measurements

Journal of the American Heart Association: Cardiovascular and Cerebrovascular Disease, 2020
Background Although ischemic heart disease has a complex and multilevel origin, the diagnostic approach is mainly focused on focal obstructive disease as assessed by pressure‐derived indexes.
Valérie E. Stegehuis, Gilbert W. M. Wijntjens, Sukhjinder S. Nijjer, Guus A. de Waard, Tim P. van de Hoef, Sayan Sen, Ricardo Petraco, Mauro Echavarría‐Pinto, Martijn Meuwissen, Ibrahim Danad, Paul Knaapen, Javier Escaned, Justin E. Davies, Niels van Royen, Jan J. Piek   +14 more
doaj   +1 more source