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[Intra- and postoperative changes in blood viscosity].

A Pouchè1, F Biasca, A Piccinelli

  • 1Clinica Chirurgica dell'Università degli Studi di Brescia.

Annali Italiani Di Chirurgia
|March 1, 1991
PubMed
Summary

Intraoperative hemodilution significantly decreases blood viscosity after vascular surgery, offering short-term protection against thrombosis. However, surgery itself increases viscosity post-operation, suggesting extended antithrombotic prophylaxis may be beneficial.

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Area of Science:

  • Cardiovascular Surgery
  • Hematology
  • Vascular Physiology

Background:

  • Surgical procedures can impact blood viscosity and thrombosis risk.
  • Hemodilution is a common intraoperative fluid management technique.
  • Understanding post-operative viscosity changes is crucial for managing thrombotic events.

Purpose of the Study:

  • To investigate the effects of intraoperative hemodilution on blood and plasma viscosity following aorto-iliac reconstruction.
  • To assess the impact of surgical procedures (thyroidectomy, cholecystectomy, hernioplasty) on blood viscosity.
  • To evaluate the role of hemodilution and surgical stress in postoperative thrombosis risk.

Main Methods:

  • Blood and plasma viscosity were measured in patients undergoing aorto-iliac reconstruction and control groups.

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  • Hemodilution effects were mathematically corrected to a standard hematocrit.
  • Viscosity changes were monitored during the perioperative and postoperative periods.

    • Main Results:

    • Intraoperative hemodilution during vascular reconstruction led to a significant, sustained decrease in blood and plasma viscosity.
    • After correcting for hemodilution, surgical operations consistently increased blood viscosity, an effect that persisted postoperatively.
    • Hemodilution demonstrated a protective effect against thrombosis, while non-hemodiluted states indicated a need for prolonged prophylaxis.

    Conclusions:

    • Hemodilution provides a temporary reduction in blood viscosity, potentially mitigating immediate postoperative thrombosis risk.
    • Surgical interventions, independent of their scale, induce a lasting increase in blood viscosity.
    • Extended antithrombotic prophylaxis beyond the usual perioperative period may be warranted in the absence of intraoperative hemodilution.