Cardiovascular Biophysics Laboratory

Washington University, School of Medicine

 

Cardiovascular Division
Department of Internal Medicine
Program in Cell Biology and Physiology
Department of Biomedical Engineering
Department of Physics

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The Cardiovascular Biophysics Laboratory employs both interdisciplinary and multidisciplinary methods encompassing selected aspects of engineering, physics, physiology, clinical cardiology, and the biomedical sciences. The overall goal is to solve basic and applied problems in physiology and medicine that have translational potential using causal, rather correlative methodologies. We thereby seek to advance the frontiers of diagnosis and therapy, as well as to serve as an environment for trainees (undergraduate, graduate, medical students, cardiology fellows and post-docs) to acquire and master concepts, to advance the state of knowledge by model-based prediction of 'new' physiology from first principles, and  participate in physiologic data acquisition and analysis.

Areas of interest include:

  • Theoretical (mathematical) biology and physiology.

  • Characterization of physical properties of cardiovascular tissue

  • Maximal information extraction from in-vivo physiologic signals

  • Mathematical modeling of cardiovascular function

  • Nonlinear dynamics, thermodynamics and optimization principles of cardiovascular function

  • Development of new technology for imaging and physiologic signal acquisition and processing

Imaging and signal acquisition modalities include multi transducer, micromanometric conductance catheter based cardiac catheterization, ventriculography and angiography, echocardiography, and cardiovascular MRI.

     

       

    

Our Work in the Popular Press

How do you measure a broken heart? (June 14, 2006)

YouTube interview with Dr.Kovács. (Jan 8, 2008)

Eat less or exercise more? (Jan 10, 2008)

Man of Heart (May 1, 2008)

 

Recent Publication
from
Cardiovascular Biophysics Laboratory

2008:

1). Zhang W, Kovács SJ. The Diastatic Pressure-Volume Relationship Is Not the Same as the End-Diastolic Pressure-Volume Relationship. Am J Physiol Heart Circ Physiol.doi:10.1152/ajpheart.00200.2008. In Press. [Abstract]

2). Riordan MM, Kovács SJ. Elucidation of spatially distinct compensatory mechanisms in diastole: radial compensation for impaired longitudinal filling in left ventricular hypertrophy. J Appl Physiol. 2008;104:513-520. [Full Text]

3). Riordan MM, Weiss EP, Meyer TE, Ehsani AA, Racette SB, Villareal DT, Fontana L, Holloszy JO, and Kovács SJ. The Effects of Caloric Restriction- and Exercise-Induced Weight Loss on Left Ventricular Diastolic Function. Am J Physiol Heart Circ Physiol. 2008;294:H1174-82. [Abstract]

4). Chung CS, Kovács SJ. The physical determinants of left ventricular isovolumic pressure decline: Model-based prediction with in-vivo validation. Am J Physiol Heart Circ Physiol. 2008;294:H1589-H1596. [Full Text]

2007:

1). Chung CS, Kovács SJ. Pressure Phase-Plane Based Determination of the Onset of Left Ventricular Relaxation. Cardiovasc Eng. 7:162-171, 2007. [Abstract]

2). Zhang W, Chung CS, Shmuylovich L, Kovács SJ. Viewpoint: Is Left Ventricular Volume During Diastasis the Real Equilibrium Volume and, What is its Relationship to Diastolic Suction? J Appl Physiol. doi:10.1152/japplphysiol.00799.2007, 2007. In Press. [Full Text]

3). Riordan MM, Kovács SJ. Stiffness and Relaxation-based Quantitation of Radial Left Ventricular Oscillations: Elucidation of Regional Diastolic Function Mechanisms. J Appl Physiol. 2007;102:1862-1870. [Full Text]

4). Riordan MM, Kovács SJ. Absence of Diastolic Mitral Annular Oscillations is a Marker for Relaxation-related Diastolic Dysfunction. Am J Physiol Heart Circ Physiol. 2007;292:H2952-H2958. [Full Text]

5). Shmuylovich L, Kovács SJ. E-wave Deceleration Time May Not Provide an Accurate Determination of Left Ventricular Chamber Stiffness if Left Ventricular Relaxation/Viscoelasticity is Unknown. Am J Physiol Heart Circ Physiol. 2007;292: H2712-H2720. [Full Text]

6). Zhang W, Chung CS, Riordan MM, Wu Y, Shmuylovich L, Kovács SJ. The Kinematic Filling Efficiency Index of the Left Ventricle: Contrasting Normal vs. Diabetic Physiology. Ultrasound Med. Biol., 2007;33:842-850. [Full Text]

2006:

1). Wu Y, Yu Y and Kovács SJ. Contraction-Relaxation Coupling Mechanism Characterization in the Thermodynamic Phase-Plane: Normal vs. Impaired Left Ventricular Ejection Fraction. J App Physiol, 2006;102: 1367-1373. [Full Text]

2). Zhang W, Chung CS, Kovács SJ. Derivation and Left Ventricular Pressure Phase Plane Based Validation of a Time Dependent Isometric Crossbridge Attachment Model. Cardiovascular Engineering. 2006;6:132-144 . [Full Text]

3). Chung CS, Strunc A, Oliver R, Kovács SJ. Diastolic ventricular-vascular stiffness and relaxation relation: elucidation of coupling via pressure phase plane-derived indexes. Am J Physiol Heart Circ Physiol. 2006;291(5):H2415-23. [Full Text]

4). Wu Y and Kovács SJ. Frequency-based analysis of the early, rapid-filling pressure-flow relation elucidates diastolic efficiency mechanisms. Am J Physiol Heart Circ Physiol. 2006;291: H2942-H2949 [Full Text]

5). Riordan MM, Kovács SJ. Relationship of pulmonary vein flow to left ventricular short-axis epicardial displacement in diastole: model-based prediction with in vivo validation. Am J Physiol Heart Circ Physiol. 2006;291(3):H1210-5. [Full Text]

6). Shmuylovich L, Kovács SJ. A load-independent index of diastolic filling: model-based derivation with in-vivo validation in control and diastolic dysfunction subjects. Journal of Applied Physiology, 2006;101: 92-101. [Full Text]

7). Chung CS, Ajo DM, Kovács SJ. The Isovolumic Pressure to Early Rapid Filling Decay Rate Relation: Model-based Derivation and Validation Via Simultaneous Catheterization-Echocardiography. Journal of Applied Physiology 2006;100:528 - 534. [Full Text]

8). Meyer TE,  Kovács SJ,  Ehsani AA, Klein S, Holloszy JO, Fontana L. Long-term Caloric Restriction Slows Cardiac Aging in Humans. Journal of the American College of Cardiology, 2006; 47:398-402.[Full Text]

9). Chung CS,  Kovács SJ. Consequences of Increasing Heart Rate on Deceleration Time, Velocity Time Integral, and E/A.  American Journal of Cardiology. 2006;97:130-136.        [Full Text]

10). Riordan MM, Kovács SJ. Quantitation of Mitral Annular Oscillations and Longitudinal "Ringing" of the Left Ventricle: A New Window into Longitudinal Diastolic Function. J Appl Physiol 2006 Jan;100:112 - 119.[Full Text]