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Functional Consequences of Regional Heterogeneity in the Left Ventricle

  • Wilbur Y. W. Lew
Part of the Institute for Nonlinear Science book series (INLS)

Abstract

The left ventricle is characterized by significant regional heterogeneity in structure, electrophysiology, and function. This discussion focuses on the functional consequences of regional heterogeneity. First we examine the extent of regional heterogeneity in deformations observed under physiologic conditions. The importance of considering the direction as well as the magnitude of maximal deformations will be emphasized. Second, we discuss potential mechanisms for regional heterogeneity in deformations. The potential contribution of electrophysiologic, anatomic, structural, and geometric factors will be considered. Third, we examine the functional consequences of regional heterogeneity using experimental models. Regional ischemia is used to examine the mechanical interaction between ischemic and nonischemic areas, that is, the interaction between “weak” and “strong” muscles. Regional inotropic stimulation is used to produce subtle alterations in regional heterogeneity to examine the mechanical interaction between “strong” and “stronger” muscles. Finally, we correlate some of the predictions from theoretical models of acute ischemia and chronic infarction with the experimental observations.

Keywords

Left Ventricle Left Anterior Descend Ventricular Pace Regional Heterogeneity Ischemic Zone 
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Copyright information

© Springer-Verlag New York, Inc. 1991

Authors and Affiliations

  • Wilbur Y. W. Lew
    • 1
    • 2
  1. 1.Cardiology Section, Department of MedicineUniversity of CaliforniaSan DiegoUSA
  2. 2.Veterans Administration Medical CenterSan DiegoUSA

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