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1,200 results on '"Shiota, Takahiro"'

2. Blinded, randomized trial of sonographer versus AI cardiac function assessment

Author

He, Bryan, Kwan, Alan C, Cho, Jae Hyung, Yuan, Neal, Pollick, Charles, Shiota, Takahiro, Ebinger, Joseph, Bello, Natalie A, Wei, Janet, Josan, Kiranbir, Duffy, Grant, Jujjavarapu, Melvin, Siegel, Robert, Cheng, Susan, Zou, James Y, and Ouyang, David

Subjects
Biomedical and Clinical Sciences, Clinical Sciences, Cancer, Cardiovascular, Heart Disease, Clinical Research, Clinical Trials and Supportive Activities, Humans, Artificial Intelligence, Echocardiography, Stroke Volume, Ventricular Function, Left, Single-Blind Method, Workflow, Reproducibility of Results, Heart Function Tests, Cardiologists, General Science & Technology
Abstract

Artificial intelligence (AI) has been developed for echocardiography1-3, although it has not yet been tested with blinding and randomization. Here we designed a blinded, randomized non-inferiority clinical trial (ClinicalTrials.gov ID: NCT05140642; no outside funding) of AI versus sonographer initial assessment of left ventricular ejection fraction (LVEF) to evaluate the impact of AI in the interpretation workflow. The primary end point was the change in the LVEF between initial AI or sonographer assessment and final cardiologist assessment, evaluated by the proportion of studies with substantial change (more than 5% change). From 3,769 echocardiographic studies screened, 274 studies were excluded owing to poor image quality. The proportion of studies substantially changed was 16.8% in the AI group and 27.2% in the sonographer group (difference of -10.4%, 95% confidence interval: -13.2% to -7.7%, P

Published
2023

17. Long-Term Impact of Small Mitral Valve Orifice Area After Transcatheter Edge-to-Edge Mitral Valve Repair on Clinical Outcome: A 3D Echocardiography Study

Author

Kagawa, Shunsuke, primary, Hasegawa, Hiroko, additional, Kuwajima, Ken, additional, Yamane, Takafumi, additional, Ogawa, Mana, additional, Patel, Dhairya, additional, Salseth, Tracy, additional, Sekhon, Navjot, additional, Skaf, Sabah, additional, Chakravarty, Tarun, additional, Makar, Moody, additional, Makkar, Raj R., additional, and Shiota, Takahiro, additional

Published
2023
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27. CKP Hierarchy, Bosonic Tau Function and Bosonization Formulae

Author

van de Leur, Johan W., Orlov, Alexander Yu., and Shiota, Takahiro

Subjects
Mathematical Physics, Mathematics - Probability, Nonlinear Sciences - Exactly Solvable and Integrable Systems
Abstract

We develop the theory of CKP hierarchy introduced in the papers of Kyoto school [Date E., Jimbo M., Kashiwara M., Miwa T., J. Phys. Soc. Japan 50 (1981), 3806-3812] (see also [Kac V.G., van de Leur J.W., Adv. Ser. Math. Phys., Vol. 7, World Sci. Publ., Teaneck, NJ, 1989, 369-406]). We present appropriate bosonization formulae. We show that in the context of the CKP theory certain orthogonal polynomials appear. These polynomials are polynomial both in even and odd (in Grassmannian sense) variables.

Published
2011
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30. Comparison of prognostic value among echocardiographic surrogates of right ventricular–pulmonary arterial coupling: A three‐dimensional echocardiographic study.

Author

Kuwajima, Ken, Ogawa, Mana, Ruiz, Irving, Yamane, Takafumi, Hasegawa, Hiroko, Yagi, Nobuichiro, Rader, Florian, Siegel, Robert J., and Shiota, Takahiro

Subjects
HEART disease prognosis, HEART disease related mortality, BLOOD pressure, ECHOCARDIOGRAPHY, VENTRICULAR ejection fraction, RIGHT heart ventricle, SYSTOLIC blood pressure, MULTIVARIATE analysis, PULMONARY artery, RETROSPECTIVE studies, ACQUISITION of data, GLOBAL longitudinal strain, MEDICAL records, HOSPITAL care, DESCRIPTIVE statistics, HEART physiology, STROKE volume (Cardiac output)
Abstract

Objectives: Right ventricular (RV)–pulmonary arterial (PA) coupling is important in various cardiac diseases. Recently, several echocardiographic surrogates for RV–PA coupling have been proposed and reported to be useful in predicting outcomes. However, it remains unclear which surrogate is the most clinically relevant. This study aimed to comprehensively compare the prognostic value of different echocardiographic RV–PA coupling surrogates. Methods: We retrospectively reviewed 242 patients with various cardiac conditions who underwent comprehensive transthoracic echocardiography with three‐dimensional RV data. In addition to conventional parameters including tricuspid annular plane systolic excursion (TAPSE), fractional area change (FAC), and PA systolic pressure (PASP), we analyzed RV free wall and global longitudinal strain (FWLS and GLS). We also obtained RV ejection fraction (RVEF), stroke volume (SV), and end‐systolic volume (ESV) using three‐dimensional RV analysis. RV–PA coupling surrogates were calculated as TAPSE/PASP, FAC/PASP, FWLS/PASP, GLS/PASP, RVEF/PASP, and SV/ESV. The study endpoint was a composite outcome of all‐cause death or cardiovascular hospitalization within 1 year. Results: In multivariable analysis, all the RV–PA coupling surrogates were independent predictors of the outcome. Among the surrogates, the model with TAPSE/PASP showed the lowest prognostic value in model fit and discrimination ability, whereas the model with RVEF/PASP exhibited the highest prognostic value. The partial likelihood ratio test indicated that the model with RVEF/PASP was significantly better than the model with TAPSE/PASP (p <.024). Conclusion: All the RV–PA coupling surrogates were independent predictors of the outcome. Notably, RVEF/PASP had the highest prognostic value among the surrogates. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Universality of Rank 6 Plucker Relations and Grassmann Cone Preserving Maps

Author

Kasman, Alex, Pedings, Kathryn, Reiszl, Amy, and Shiota, Takahiro

Subjects
Mathematics - Algebraic Geometry, Mathematical Physics, 14M15, 15A75
Abstract

The Plucker relations define a projective embedding of the Grassmann variety Gr(k,n). We give another finite set of quadratic equations which defines the same embedding, and whose elements all have rank 6. This is achieved by constructing a certain finite set of linear maps from the pth exterior power of n-dimensional space to the 2nd exterior power of 4-dimensional space and pulling back the unique Plucker relation on the latter. We also give a quadratic equation depending on (p+2) parameters having the same properties.

Published
2005

40. Subclinical leaflet thrombosis in surgical and transcatheter bioprosthetic aortic valves: an observational study

Author

Ramzy, Danny, Cheng, Wen, Siegel, Robert J, Thomson, Louise M, Mangat, Geeteshwar, Hariri, Babak, Sawaya, Fadi J, Iversen, Helle K, Chakravarty, Tarun, Søndergaard, Lars, Friedman, John, De Backer, Ole, Berman, Daniel, Kofoed, Klaus F, Jilaihawi, Hasan, Shiota, Takahiro, Abramowitz, Yigal, Jørgensen, Troels H, Rami, Tanya, Israr, Sharjeel, Fontana, Gregory, de Knegt, Martina, Fuchs, Andreas, Lyden, Patrick, Trento, Alfredo, Bhatt, Deepak L, Leon, Martin B, and Makkar, Raj R

Published
2017
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41. Calogero-Moser hierarchy and KP hierarchy

Author

Shiota, Takahiro

Subjects
High Energy Physics - Theory
Abstract

The space of solutions of the rational Calogero-Moser hierarchy, and the space of solutions of the KP hierarchy whose tau functions are monic polynomials in $t_1$ with coefficients depending on $t_n$, $n > 1$, are identified, generalizing earlier results of Airault-McKean-Moser and Krichever., Comment: 8pages

Published
1994
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45. COMPARISON OF THE EFFECT OF TRANSCATHETER EDGE-TO-EDGE REPAIR ON THE MITRAL VALVE APPARATUS ACCORDING TO ATRIAL FUNCTIONAL MITRAL REGURGITATION SUBTYPES

Author

Hasegawa, Hiroko, primary, Kuwajima, Ken, additional, Yamane, Takafumi, additional, Ogawa, Mana, additional, Yagi, Nobuichiro, additional, Makar, Moody, additional, Skaf, Sabah, additional, Rader, Florian, additional, Chakravarty, Tarun, additional, Siegel, Robert J., additional, Makkar, Raj R., additional, and Shiota, Takahiro, additional

Published
2023
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