Monitoring of heparins in antithrombin-deficient patients

Frederik Nanne Croles*, Michael V. Lukens, Rene Mulder, Moniek P. M. de Maat, Andre B. Mulder, Karina Meijer

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

9 Citations (Scopus)

Abstract

Introduction: Heparins exert their anticoagulant effect through activation of antithrombin. Whether antithrombin deficiency leads to clinically relevantly reduced anti-Xa activity of heparins is unknown. We investigated the relation between antithrombin deficiency and anti-Xa activity measurements of plasma samples spiked with unfractionated heparin (UFH) or low-molecular-weight heparin (LMWH).

Materials and methods: Plasma samples from 34 antithrombin-deficient subjects and 17 family controls were spiked with UFH and LMWH (nadroparin) aimed to correspond with an anti-Xa activity of 0.8 IU/mL. Antithrombin, beta-antithrombin and anti-Xa activities were measured.

Results: Mean anti-Xa activity with LWMH was 0.55 IU/mL (0.30-0.74) (recovery 69%, 38-93%) in antithrombin-deficient subjects and 0.82 (0.71-0.89) IU/mL in controls (recovery 103%, 89-111%). Expected anti-Xa measurements after LMWH spiking were found in 17/17 non-deficient subjects and in 8/34 antithrombin-deficient subjects. Anti-Xa measurements in the expected range (0.6-1.0 IU/mL) after UFH spiking were found in 17/17 non-deficient subjects and in 1/22 antithrombin-deficient subjects. Antithrombin activity correlated with anti-Xa activity of UFH (R= 0.77) and LMWH (R= 0.66). Mixing studies of pooled normal plasma and antithrombin-deficient plasma showed that anti-Xa recovery was linearly reduced with antithrombin activity decreasing below 100%.

Conclusions: Reduced antithrombin activity causes significantly reduced anti-Xa levels. Standard LWMH- or UFH-doses are likely to lead to under treatment in antithrombin-deficient individuals.

Original languageEnglish
Pages (from-to)8-12
Number of pages5
JournalThrombosis Research
Volume175
DOIs
Publication statusPublished - Mar-2019

Keywords

  • Antithrombin III deficiency
  • Heparin
  • Low-molecular-weight heparin
  • SERPINC1 gene
  • Anti-Xa measurements
  • BETA-ANTITHROMBIN
  • VENOUS THROMBOEMBOLISM
  • UNFRACTIONATED HEPARIN
  • RISK
  • HEREDITARY
  • THROMBOSIS
  • PREGNANCY
  • AFFINITY
  • GLYCOSYLATION
  • MANAGEMENT

Cite this