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Differential Cardiac Responses after Passive Leg Raising.

Ricardo Castro1, Eduardo Kattan2, Glenn Hernández2

  • 1Departamento de Medicina Intensiva, Facultad de Medicina, Pontificia Universidad Católica de Chile, Av. Diagonal Paraguay #362 piso 6 Santiago Centro, Santiago, 8330049, RM, Chile. rcastrol@uc.cl.

Journal of Clinical Monitoring and Computing
|June 6, 2024
PubMed
Summary

Passive leg raising (PLR) can cause sustained cardiac index increases in some fluid-responsive ICU patients, suggesting persistent hemodynamic effects. This finding may inform fluid management strategies in mechanically ventilated patients.

Keywords:
Cardiac indexFluid-responsivenessPassive leg raisePreload-responsiveness

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Area of Science:

  • Critical Care Medicine
  • Cardiovascular Physiology

Background:

  • Passive leg raising (PLR) is used to assess fluid responsiveness in mechanically ventilated patients.
  • Previous studies noted variable cardiac responses to PLR, especially in positive tests.
  • Understanding these hemodynamic effects is crucial for optimizing patient management.

Purpose of the Study:

  • To investigate the hemodynamic effects of PLR in mechanically ventilated patients undergoing fluid removal.
  • To identify distinct cardiac responses to PLR in preload-responsive and unresponsive patients.
  • To explore potential mechanisms behind sustained increases in cardiac index after PLR.

Main Methods:

  • Retrospective analysis of hemodynamic data from 27 mechanically ventilated patients.
  • Utilized bioreactance monitoring to record stroke volume and cardiac index (CI) before and after PLR.
  • Analyzed 60 PLR procedures, categorizing patients by preload responsiveness.

Main Results:

  • No significant CI changes were observed in preload-unresponsive patients.
  • Preload-responsive patients showed two response patterns: transient CI peak or sustained CI elevation.
  • Sustained CI increase was noted when the change in CI during PLR exceeded 25% (p=0.034).

Conclusions:

  • PLR can induce a sustained increase in cardiac index in certain preload-responsive patients.
  • This sustained effect may involve autotransfusion and sympathetic activation influencing venous return and vascular tone.
  • Further research with larger cohorts is needed to confirm these findings and elucidate underlying mechanisms.