Physical and physiological determinants of pulmonary venous flow: Numerical analysis

James D. Thomas*, Jianhua Zhou, Neil Greenberg, George Bibawy, Patrick M. Mccarthy, Pieter M. Vandervoort

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

To study the physical and physiological determinants of transmitral and pulmonary venous flow, a lumped-parameter model of the cardiovascular system has been created, modeling the instantaneous pressure, volume, and influx/efflux of the pulmonary veins, left atrium and ventricle, systemic arteries and veins, right atrium and ventricle, and pulmonary arteries. Initial validation has been obtained by direct comparison with transesophageal echocardiographic recordings of mitral and pulmonary venous velocity for the following clinical situations: normal diastolic function, delayed ventricular relaxation, restrictive filling due to severe systolic dysfunction, severe mitral regurgitation before and after valve repair surgery, and premature atrial contraction occurring during ventricular systole. Sensitivity analysis has been performed with a Jacobian matrix, representing the proportional change in a group of output indexes (y(i)) in response to isolated changes in input parameters (x(j)), [(δy(i)/y(i))/(δx(j)/x(j))], demonstrating the complementary nature of mitral and pulmonary venous A-wave velocity for predicting ventricular stiffness and atrial systolic function. This unified numerical-experimental programming environment should facilitate model refinement and physiological data exploration, in particular guiding more accurate interpretations of Doppler echocardiographic data.

Original languageEnglish (US)
Pages (from-to)H2453-H2465
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume272
Issue number5 41-5
DOIs
StatePublished - 1997

Keywords

  • Doppler echocardiography
  • diastolic function
  • hemodynamics
  • mathematical model
  • mitral flow
  • systolic function
  • valvular function

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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