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Cardiac Oxygen Consumption and Hemodynamics

  • Nicolaas Westerhof
  • Nikolaos Stergiopulos
  • Mark I. M. Noble
  • Berend E. Westerhof
Chapter

Abstract

Cardiac oxygen consumption can be determined from the product of coronary flow and arterio-venous oxygen content difference. To circumvent these preferentially simultaneous but difficult determinations, many indices for estimating oxygen consumption from mechanical variables have been proposed. Heart rate is a primary determinant of oxygen consumption. The second major determinant is tension (stress) generation of the cardiac muscle, mostly measured as ventricular pressure. The most used methods are the (Heart-)Rate Pressure Product (RPP), often used in biochemical studies, and the Tension Time Index (area under pressure during ejection, TTI). Total oxygen consumption depends on ‘unloaded’ contraction, i.e., ‘cell maintenance’, plus excitation-contraction coupling (Ees, the slope of the End-Systolic Pressure-Volume relation), and the Pressure-Volume Area (PVA) that is the sum of external work plus potential energy measurable from the Pressure-Volume Relation.

Keywords

Cardiac oxygen consumption Rate pressure product Tension time index Pressure-volume area Potential energy 

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2019

Authors and Affiliations

  • Nicolaas Westerhof
    • 1
  • Nikolaos Stergiopulos
    • 2
  • Mark I. M. Noble
    • 3
  • Berend E. Westerhof
    • 1
  1. 1.Department of Pulmonary Diseases, Amsterdam Cardiovascular SciencesVU University Medical CenterAmsterdamThe Netherlands
  2. 2.Laboratory of Hemodynamics and Cardiovascular TechnologyEcole Polytechnique Fédérale de Lausanne (EPFL), Institute of BioengineeringLausanneSwitzerland
  3. 3.Cardiovascular Medicine, Department of Medicine and TherapeuticsUniversity of AberdeenAberdeenUnited Kingdom

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