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Exercise Hemodynamics in Patients with Heart Failure

  • Shigetake Sasayama
  • Hidetsugu Asanoi

Summary

The concept of ventriculo-arterial coupling provides a useful framework to understand the exercise response in normal and failing hearts. Ventricular and arterial properties are matched so as to optimize ventricular work efficiency in normal hearts and to maximize stroke work in moderately depressed hearts. Exercise capacity is generally reduced in failing hearts. Thereby, decreases in anaerobic threshold and peak oxygen consumption are inversely related to the resting plasma catecholamine levels.

During anaerobic exercise, stroke volume is augmented by an increase in contractility and an enhanced mechanical efficiency in normal subjects, whereas in patients with cardiac dysfunction, stroke volume is augmented through an increase in ventricular volume without any change in both ventricular and arterial volume elastance. Thus, the regulation of stroke volume during exercise shifts from a catecholamine-mediated reduction in end-systolic volume to a greater reliance on the Frank-Starling mechanism.

Keywords

Stroke Volume Anaerobic Threshold Stroke Work Arterial Elastance Plasma Norepinephrine Level 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Tokyo 1989

Authors and Affiliations

  • Shigetake Sasayama
  • Hidetsugu Asanoi
    • 1
  1. 1.The Second Department of Internal MedicineToyama Medical and Pharmaceutical UniversityToyamaJapan

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