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Related Experiment Videos

Hypervolemic haemodilution and completed stroke: how important is the application time for its effect?

P Költringer1, W Langsteger, F Reisecker

  • 1Department of Neurology, Barmherzgie Brüder Eggenberg Hospital, Graz, Austria.

Neurological Research
|January 1, 1992
PubMed
Summary

Hypervolemic hemodilution improves hemorheological changes in stroke patients. Longer infusion times (6 hours) maintained these benefits for 18 hours, unlike shorter durations.

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Area of Science:

  • Neurology
  • Hematology
  • Critical Care Medicine

Background:

  • Hypervolemic hemodilution is a therapeutic strategy used in stroke management.
  • The optimal application time for achieving sustained hemorheological changes is not well-defined.
  • Previous studies have yielded inconsistent results regarding the efficacy of hypervolemic hemodilution.

Purpose of the Study:

  • To investigate the acute influence of different infusion application times on hemorheological changes in stroke patients.
  • To determine the optimal duration for hypervolemic hemodilution to achieve significant and lasting hemorheological effects.
  • To identify potential reasons for the variability in outcomes observed in previous hypervolemic hemodilution studies.

Main Methods:

  • 75 completed stroke patients were randomly assigned to three groups receiving 500 ml 6% HES 200.000/0.6-0.66 infusion over 2 hours (Group A), 4 hours (Group B), or 6 hours (Group C).

Related Experiment Videos

  • Haematocrit (HCT), whole blood viscosity (VI-VB), blood elasticity (EL-VB), and plasma viscosity (VI-PL) were measured before infusion, and at 6 and 18 hours post-infusion.
  • Hemodynamic and hemorheological parameters were compared to baseline values across all groups and time points.

    • Main Results:

    • All groups demonstrated significant decreases in HCT, VI-VB, EL-VB, and VI-PL at 6 hours post-infusion.
    • At 18 hours, Group A showed significantly higher HCT and increasing trends in VI-VB and EL-VB compared to baseline.
    • Group B exhibited a significant decrease in VI-VB at 18 hours, while Group C maintained significantly lower values for all measured parameters compared to baseline.

    Conclusions:

    • Extended application times for hypervolemic hemodilution are crucial for achieving sustained and effective hemorheological changes.
    • The duration of infusion may be a critical factor explaining the inconsistent results in prior studies on hypervolemic hemodilution for stroke.
    • Optimizing infusion duration is essential for maximizing the therapeutic benefits of hypervolemic hemodilution in stroke patients.