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

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 régurgitation 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,-) in response to isolated changes in input parameters (xj), [(oyi/yj-VCo-4/xi)], demonstrating the complementary nature of mitral and pulmonary venous A-wave velocity for predicting ventricular stiffness and atrial systolic function. This unified numericalexperimental programming environment should facilitate model refinement and physiological data exploration, in particular guiding more accurate interpretations of Doppler echocardiographic data. Doppler echocardiography; mathematical model; mitral flow; diastolic function; systolic function; hemodynamics; valvular function

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume41
Issue number5
StatePublished - Dec 1 1997

ASJC Scopus subject areas

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

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