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Related Experiment Videos

Does passive leg raising increase cardiac performance? A study using Doppler echocardiography

Z S Kyriakides1, A Koukoulas, I A Paraskevaidis

  • 1Athens General Hospital, Greece.

International Journal of Cardiology
|May 1, 1994
PubMed
Summary

Passive leg elevation enhances cardiac performance in stable coronary artery disease patients by increasing preload, supporting the Frank-Starling mechanism. This maneuver improves cardiovascular metrics without significant autotransfusion concerns in this population.

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Area of Science:

  • Cardiology
  • Physiology

Background:

  • Passive leg raising (PLR) is a common intervention for hypovolemic shock.
  • Its autotransfusion effect is debated, with many studies showing limited impact.

Purpose of the Study:

  • To evaluate the cardiovascular effects of PLR in stable coronary artery disease (CAD) patients.
  • To assess if PLR improves cardiac performance via preload augmentation.

Main Methods:

  • Echocardiography and continuous wave Doppler of aortic flow were used in 31 stable CAD patients.
  • Measurements were taken in a supine position and after passive leg elevation.

Main Results:

  • Passive leg elevation significantly increased left ventricular end-diastolic dimension (P=0.007).

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  • Fractional shortening (P=0.01), peak aortic velocity (P=0.02), and aortic velocity time integral (P=0.0007) also showed significant increases.

    • Conclusions:

    • Passive leg elevation effectively increases preload in normovolemic CAD patients.
    • This preload increase enhances cardiac performance, consistent with the Frank-Starling relationship.