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Related Experiment Videos

Elevated platelet-free calcium in uraemia.

A Moosa1, M Greaves, C B Brown

  • 1Department of Haematology, Royal Hallamshire Hospital, Sheffield.

British Journal of Haematology
|March 1, 1990
PubMed
Summary

Bleeding in uraemia (uremia) is common, but elevated platelet calcium levels do not explain it. Uremic platelets aggregate normally, suggesting other factors like reduced hematocrit contribute to bleeding complications.

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Area of Science:

  • Nephrology
  • Hematology
  • Biochemistry

Background:

  • Bleeding complications are frequent in patients with uraemia.
  • The exact cause of haemorrhage in uraemia remains controversial, with primary haemostasis defects suspected.
  • Previous studies on platelet aggregation and biochemistry in uraemia yielded conflicting results.

Purpose of the Study:

  • To investigate platelet aggregation, intracellular calcium levels, and calmodulin activity in uraemic patients.
  • To determine if altered platelet calcium or calmodulin contributes to bleeding disorders in uraemia.

Main Methods:

  • Measured platelet aggregation in uraemic subjects and healthy controls.
  • Assessed basal and ionophore A23187-stimulated platelet-free calcium levels.
  • Quantified calmodulin activity in platelet-rich plasma.

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Main Results:

  • Platelet aggregation was similar between uraemic and control groups.
  • Uraemic platelets showed significantly higher basal and stimulated intracellular calcium levels compared to controls.
  • Calmodulin activity in platelet-rich plasma did not differ significantly between groups.

Conclusions:

  • Elevated platelet calcium in uraemia, possibly due to plasma factors like parathyroid hormone, does not impair platelet aggregation.
  • Bleeding in uraemia is unlikely solely due to platelet calcium disturbances.
  • Other factors, such as reduced haematocrit affecting platelet-endothelial interaction, may play a more significant role in uraemic bleeding.