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[Hemorrheological modifications during normal pregnancy].

A Huisman1

  • 1Maaischap Gynaecologen, Rinjnstate EG, Arnhem, Netherlands.

Revue Francaise De Gynecologie Et D'Obstetrique
|February 25, 1991
PubMed
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During normal pregnancy, whole blood viscosity decreases due to lower hematocrit, despite increased red cell aggregation. Hematocrit is the main factor influencing blood viscosity, especially at lower shear rates.

Area of Science:

  • Obstetrics and Gynecology
  • Hematology
  • Physiology

Context:

  • Normal pregnancy involves significant physiological changes affecting blood properties.
  • Understanding these changes is crucial for maternal and fetal health.
  • Previous studies have yielded conflicting results on blood viscosity during gestation.

Purpose:

  • To investigate changes in whole blood viscosity and its determinants during normal pregnancy.
  • To measure variations in hematocrit, red cell aggregation, and plasma viscosity throughout gestation.
  • To elucidate the interplay of these factors in regulating blood flow during pregnancy.

Summary:

  • Whole blood viscosity decreased until week 30, then slightly increased, primarily influenced by hematocrit and plasma viscosity.

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  • Red cell aggregation increased throughout pregnancy, largely due to elevated fibrinogen levels.
  • Plasma viscosity rose in the second and third trimesters, reflecting a balance between fibrinogen and serum proteins.

    • Impact:

    • Findings suggest that decreased hematocrit compensates for increased red cell aggregation, reducing blood flow resistance.
    • This study provides insights into the rheological adaptations of blood during normal pregnancy.
    • The results may inform clinical assessments of pregnancy-related circulatory changes.