Search

Your search keyword '"Peshock, Ronald"' showing total 227 results
Start Over Author "Peshock, Ronald" Search Limiters Available in Library Collection
227 results on '"Peshock, Ronald"'

15. Volume catheter parallel conductance varies between end-systole and end-diastole

Author

Wei, Chia-Ling, Valvano, Jonathan W., Feldman, Marc D., Nahrendorf, Matthias, Peshock, Ronald, and Pearce, John A.

Subjects
Finite element method -- Analysis, Cardiomyopathy -- Analysis, Heart diseases -- Analysis, Biological sciences, Business, Computers, Health care industry
Abstract

In order for the conductance catheter system to accurately measure instantaneous cardiac blood volume, it is necessary to determine and remove the contribution from parallel myocardial tissue. In previous studies, the myocardium has been treated as either purely resistive or purely capacitive when developing methods to estimate the myocardial contribution. We propose that both the capacitive and the resistive properties of the myocardium are substantial, and neither should be ignored. Hence, the measured result should be labeled admittance rather than conductance. We have measured the admittance (magnitude and phase angle) of the left ventricle in the mouse, and have shown that it is measurable and increases with frequency. Further, this more accurate technique suggests that the myocardial contribution to measured admittance varies between end-systole and end-diastole, contrary to previous literature. We have tested these hypotheses both with numerical finite-element models for a mouse left ventricle constructed from magnetic resonance imaging images, and with in vivo admittance measurements in the murine left ventricle. Finally, we propose a new method to determine the instantaneous myocardial contribution to the measured left ventricular admittance that does not require saline injection or other intervention to calibrate. Index Terms--Admittance, conductance catheter, finite-element model, parallel conductance, parallel myocardial admittance, phase angle measurement, ventricular volume.

Published
2007

22. ASSOCIATION BETWEEN CARDIAC VARIABLES AND COGNITIVE FUNCTION IN MIDDLE-AGED ADULTS: ANALYSIS FROM THE DALLAS HEART STUDY-2

Author

Chia, Richard, primary, Ayers, Colby, additional, Rosetti, Heidi, additional, Pandey, Ambarish, additional, Berry, Jarett D., additional, Kozlitina, Julia, additional, Drazner, Mark H., additional, Garg, Sonia, additional, Peshock, Ronald, additional, de Lemos, James A., additional, Zhang, Rong, additional, and Vongpatanasin, Wanpen, additional

Published
2020
Full Text
View/download PDF

27. Prediction of total subcutaneous abdominal, intraperitoneal, and retroperitonal adipose tissue masses in men by a single axial magnetic resonance imaging slice

Author

Abate, Nicola, Garg, Abhimanyu, Coleman, Ryian, Grundy, Scott M., and Peshock, Ronald M.

Subjects
Magnetic resonance imaging, Adipose tissues -- Measurement, Food/cooking/nutrition, Health
Abstract

To develop a simplified but accurate method for determining the masses of various abdominal adipose tissue compartments, we studied the predictive value of masses of intraperitoneal, retroperitoneal, and subcutaneous abdominal adipose tissue determined on single axial abdominal magnetic resonance imaging (MRI) slices taken at various intervertebral levels from the 12th thoracic to 1st sacral vertebra (identified on a sagittal section) for the respective total masses of each compartment calculated from contiguous 10-mm thick MRI slices covering the entire abdomen in 49 men (26 without diabetes and 23 with non-insulin-dependent diabetes mellitus). The MRI slice at the intervertebral level between the lumbar (L) 2 and 3 vertebrae showed the highest and most consistent predictive value for all three compartments ([R.sup.2] = 0.85 for all). Furthermore, compared with other intervertebral levels, the L2-L3 level had a higher amount of intraperitoneal and retroperitoneal adipose tissue mass. We conclude that determining the masses of various abdominal adipose tissue compartments at the L2-L3 intervertebral level by MRI is an acceptably reliable and accurate method for studying abdominal adiposity in men.

Published
1997

28. Creating a Research and Clinical Care Partnership through EMR and Clinical Research System Integration

Author

Ranganathan, Dipti, Bell, Melody, Willett, DuWayne, and Peshock, Ronald M.

Subjects
Articles
Abstract

EMRs are essential in modern healthcare. At the same time there has been the rapid development of clinical research systems (CRS) which offer specific tools to facilitate research protocol development, execution and management. However, examples of integrating a commercial EMR and CRS are rare. We describe our experience in the analysis, resolution of issues, design, and implementation of EMR/CR integration in a large academic medical center with affiliated hospitals. Our initial results suggest that (1) neither the EMR nor CRS system alone will suffice to facilitate clinical research, (2) there are important benefits to integration of the EMR and CRS systems and (3) this integration can be leveraged across multiple institutions.

Published
2013

29. Association of Concentric Left Ventricular Hypertrophy With Subsequent Change in Left Ventricular End-Diastolic Volume

Author

Garg, Sonia, primary, de Lemos, James A., additional, Matulevicius, Susan A., additional, Ayers, Colby, additional, Pandey, Ambarish, additional, Neeland, Ian J., additional, Berry, Jarett D., additional, McColl, Roderick, additional, Maroules, Christopher, additional, Peshock, Ronald M., additional, and Drazner, Mark H., additional

Published
2017
Full Text
View/download PDF

32. Ethnic Difference in Proximal Aortic Stiffness

Author

Goel, Akshay, primary, Maroules, Christopher D., additional, Mitchell, Gary F., additional, Peshock, Ronald, additional, Ayers, Colby, additional, McColl, Roderick, additional, Vongpatanasin, Wanpen, additional, and King, Kevin S., additional

Published
2017
Full Text
View/download PDF

34. Abstract 19981: Relationship of Cardiorespiratory Fitness and Adiposity With Left Ventricular Peak Systolic Strain in Middle-age Adults: The Dallas Heart Study

Author

Pandey, Ambarish, primary, Ayers, Colby, additional, Neeland, Ian J, additional, Matulevicius, Susan, additional, Rohatgi, Anand, additional, Peshock, Ronald, additional, Drazner, Mark, additional, Sarma, Satyam, additional, De Lemos, James, additional, and Berry, Jarett D, additional

Published
2015
Full Text
View/download PDF

38. Hemodynamic and Mechanical Properties of the Proximal Aorta in Young and Middle-Aged Adults With Isolated Systolic Hypertension: The Dallas Heart Study.

Author

Yuichiro Yano, Neeland, Ian J., Ayers, Colby, Peshock, Ronald, Berry, Jarett D., Lloyd-Jones, Donald M., Greenland, Philip, Mitchell, Gary F., Vongpatanasin, Wanpen, and Yano, Yuichiro

Abstract

The aim of this study was to assess characteristic impedance (Zc) of the proximal aorta in young and middle-aged individuals with isolated systolic hypertension (ISH). Zc is an index of aortic stiffness relative to aortic size. In the Dallas Heart Study, 2001 untreated participants 18 to 64 years of age (mean age: 42.3 years; 44% black race) were divided into the following groups based on office blood pressure (BP) measurements: (1) optimal BP (systolic BP [SBP] <120 mm Hg and diastolic BP [DBP] <80 mm Hg; n=837); (2) prehypertension (SBP 120-139 mm Hg and DBP 80-89 mm Hg; n=821); (3) ISH (SBP ≥140 mm Hg and DBP <90 mm Hg; n=121); (4) isolated diastolic hypertension (SBP <140 mm Hg and DBP ≥90 mm Hg; n=44); and (5) systolic-diastolic hypertension (SBP ≥140 mm Hg and DBP ≥90 mm Hg; n=178). Zc, aortic arch pulse wave velocity, and minimum ascending aortic size were quantified using cardiovascular magnetic resonance. In multivariable-adjusted linear models, Zc was highest in the ISH group compared with the optimal BP, isolated diastolic hypertension, or systolic-diastolic hypertension groups (103.2±4.0 versus 68.3±2.1, 75.4±6.0, and 88.9±4.8 dyne*seconds/cm5, respectively; all P<0.05). The Zc-ISH association did not differ by race. Aortic pulse wave velocity was highest in the ISH group compared with the optimal BP, isolated diastolic hypertension, or systolic-diastolic hypertension groups (6.3±0.3 versus 4.3±0.1, 4.4±0.4 and 5.5±0.3 m/s, respectively; all P<0.05), whereas aortic size was similar across groups (all P>0.2). Results were similar in a subgroup of 1551 participants 18 to 49 years of age. In a multiracial population-based sample, we found evidence of a mismatch between proximal aortic stiffness and diameter in young and middle-aged adults with ISH. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

40. Developing a Cross-institutional Information Security Program

Author

Marshall, Andrea, Adrian, Pam, Marcee, Alice K., Kirksey, Kirk, and Peshock, Ronald M.

Subjects
Posters
Abstract

Healthcare organizations across the country are searching for methods to address escalating healthcare costs. One strategy is to leverage resources across affiliated but independent organizations. This approach is common in other industries; yet, protecting confidential patient information is unique to the healthcare industry. Guaranteed protection of patient confidentiality is a critical step in any inter-organizational strategy. Because of the need to leverage resources, the University of Texas Southwestern Medical Center (UT Southwestern) and its affiliates initiated a cross-institutional effort to address information security and confidentiality issues.

Published
2001

45. Extracting Actionable Findings of Appendicitis from Radiology Reports Using Natural Language Processing

Author

Rink, Bryan, Roberts, Kirk, Harabagiu, Sanda, Scheuermann, Richard H., Toomay, Seth, Browning, Travis, Bosler, Teresa, and Peshock, Ronald

Subjects
Articles
Abstract

Radiology reports often contain findings about the condition of a patient which should be acted upon quickly. These actionable findings in a radiology report can be automatically detected to ensure that the referring physician is notified about such findings and to provide feedback to the radiologist that further action has been taken. In this paper we investigate a method for detecting actionable findings of appendicitis in radiology reports. The method identifies both individual assertions regarding the presence of appendicitis and other findings related to appendicitis using syntactic dependency patterns. All relevant individual statements from a report are collectively considered to determine whether the report is consistent with appendicitis. Evaluation on a corpus of 400 radiology reports annotated by two expert radiologists showed that our approach achieves a precision of 91%, a recall of 83%, and an F1-measure of 87%.

Published
2013

Catalog

Books, media, physical & digital resources
See catalog results