Effects of unfractionated and low molecular weight heparins on platelet thromboxane biosynthesis "in vivo"

Erica De Candia, Bianca Rocca, Raffaele Landolfi, G Ciabattoni, A Antinori, R Masetti, C. Patrono

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Several "in vitro" and "in vivo" studies indicate that heparin administration may affect platelet function. In this study we investigated the effects of prophylactic heparin on thromboxane (Tx)A2 biosynthesis "in vivo", as assessed by the urinary excretion of major enzymatic metabolites 11-dehydro-TxB2 and 2,3-dinor-TxB2. Twenty-four patients who were candidates for cholecystectomy because of uncomplicated lithiasis were randomly assigned to receive placebo, unfractionated heparin, low molecular weight heparin or unfractionated heparin plus 100 mg aspirin. Measurements of daily excretion of Tx metabolites were performed before and during the treatment. In the groups assigned to placebo and to low molecular weight heparin there was no statistically significant modification of Tx metabolite excretion while patients receiving unfractionated heparin had a significant increase of both metabolites (11-dehydro-TxB2: 3844 +/- 1388 vs 2092 +/- 777, p < 0.05; 2,3-dinor-TxB2: 2737 +/- 808 vs 1535 +/- 771 pg/mg creatinine, p < 0.05). In patients randomized to receive low-dose aspirin plus unfractionated heparin the excretion of the two metabolites was largely suppressed thus suggesting that platelets are the primary source of enhanced thromboxane biosynthesis associated with heparin administration. These data indicate that unfractionated heparin causes platelet activation "in vivo" and suggest that the use of low molecular weight heparin may avoid this complication.
Original languageEnglish
Pages (from-to)942-946
Number of pages5
JournalThrombosis and Haemostasis
Volume72
Publication statusPublished - 1994

Keywords

  • Adult
  • Aspirin
  • Blood Platelets
  • Evaluation Studies as Topic
  • Female
  • Heparin
  • Heparin, Low-Molecular-Weight
  • Humans
  • Male
  • Middle Aged
  • Thromboxane A2
  • Thromboxane B2

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