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Laboratory Detection of the Antiphospholipid Syndrome via Calibrated Automated Thrombography

(2009) Thrombosis and haemostasis. 101(1). p.185-196
Author
Organization
Abstract
Lupus anticoagulants (LAC) consist of anti phospholipid antibodies, detected via their anti coagulant properties in vitro. Strong LAC relate to thromboembolic events, a hallmark of the anti-phospholipid syndrome. We have analyzed whether detection of this syndrome would benefit from thrombin generation measurements. Therefore, calibrated automated thrombography was done in normal plasma (n=30) and LAC patient plasma (n=48 non-anticoagulated, n=12 on oral anti coagulants), diluted 1: 1 with a normal plasma pool. The anti-beta(2)-glycoprotein I monoclonal antibody 23H9, with known LAC properties, delayed the lag time and reduced the peak height during thrombin generation induction in normal plasma dose-dependently (0-150 mu g/ml). At variance, LAC patient 1: 1 plasma mixtures manifested variable lag time prolongations and/or peak height reductions. Coupling these two most informative thrombin generation parameters in a peak height/lag time ratio,and upon normalization versus the normal plasma pool, this ratio distributed normally and was reduced in the plasma mixtures, for 59/60 known LAC plasmas. The normalized peak height/lag time ratio correlated well with the normalized dilute prothrombin time,diluted Russell's viper venom time and silica clotting time, measured in 1: 1 plasma mixtures (correlation coefficients 0.59-0.72). The anticoagulant effects of activated protein C (0-7.5 nM) or 23H9 (0-150 mu g/ml), spiked in the 1: 1 LAC plasma mixtures were reduced for the majority of patients, compatible with functional competition between patient LAC and activated protein C and LAC and 23H9, respectively. Hence,the normalized thrombin gene ration-derived peak height/lag time ratio identifies LAC in plasma with high sensitivity in a single assay, irrespective of the patient's treatment with oral anticoagulants.
Keywords
ANTICARDIOLIPIN ANTIBODIES, THROMBIN GENERATION, ACQUIRED-RESISTANCE, IGG ANTIBODIES, BETA(2)-GLYCOPROTEIN-I, BETA-2-GLYCOPROTEIN-I, PROTHROMBIN, PLASMA, ACTIVATED PROTEIN-C, LUPUS ANTICOAGULANTS, prothrombin, antibodies, alpha(2)-glycoprotein I, lupus anticoagulants, Thrombosis

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Citation

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Chicago
Devreese, Katrien, kathelijne peerlinck, jef arnout, and marc hoylaerts. 2009. “Laboratory Detection of the Antiphospholipid Syndrome via Calibrated Automated Thrombography.” Thrombosis and Haemostasis 101 (1): 185–196.
APA
Devreese, K., peerlinck, kathelijne, arnout, jef, & hoylaerts, marc. (2009). Laboratory Detection of the Antiphospholipid Syndrome via Calibrated Automated Thrombography. Thrombosis and haemostasis, 101(1), 185–196.
Vancouver
1.
Devreese K, peerlinck kathelijne, arnout jef, hoylaerts marc. Laboratory Detection of the Antiphospholipid Syndrome via Calibrated Automated Thrombography. Thrombosis and haemostasis. Stuttgart: Schattauer; 2009;101(1):185–96.
MLA
Devreese, Katrien, kathelijne peerlinck, jef arnout, et al. “Laboratory Detection of the Antiphospholipid Syndrome via Calibrated Automated Thrombography.” Thrombosis and haemostasis 101.1 (2009): 185–196. Print.
@article{877301,
  abstract     = {Lupus anticoagulants (LAC) consist of anti phospholipid antibodies, detected via their anti coagulant properties in vitro. Strong LAC relate to thromboembolic events, a hallmark of the anti-phospholipid syndrome. We have analyzed whether detection of this syndrome would benefit from thrombin generation measurements. Therefore, calibrated automated thrombography was done in normal plasma (n=30) and LAC patient plasma (n=48 non-anticoagulated, n=12 on oral anti coagulants), diluted 1: 1 with a normal plasma pool. The anti-beta(2)-glycoprotein I monoclonal antibody 23H9, with known LAC properties, delayed the lag time and reduced the peak height during thrombin generation induction in normal plasma dose-dependently (0-150 mu g/ml). At variance, LAC patient 1: 1 plasma mixtures manifested variable lag time prolongations and/or peak height reductions. Coupling these two most informative thrombin generation parameters in a peak height/lag time ratio,and upon normalization versus the normal plasma pool, this ratio distributed normally and was reduced in the plasma mixtures, for 59/60 known LAC plasmas. The normalized peak height/lag time ratio correlated well with the normalized dilute prothrombin time,diluted Russell's viper venom time and silica clotting time, measured in 1: 1 plasma mixtures (correlation coefficients 0.59-0.72). The anticoagulant effects of activated protein C (0-7.5 nM) or 23H9 (0-150 mu g/ml), spiked in the 1: 1 LAC plasma mixtures were reduced for the majority of patients, compatible with functional competition between patient LAC and activated protein C and LAC and 23H9, respectively. Hence,the normalized thrombin gene ration-derived peak height/lag time ratio identifies LAC in plasma with high sensitivity in a single assay, irrespective of the patient's treatment with oral anticoagulants.},
  author       = {Devreese, Katrien and peerlinck, kathelijne and arnout, jef and hoylaerts, marc},
  issn         = {0340-6245},
  journal      = {Thrombosis and haemostasis},
  keyword      = {ANTICARDIOLIPIN ANTIBODIES,THROMBIN GENERATION,ACQUIRED-RESISTANCE,IGG ANTIBODIES,BETA(2)-GLYCOPROTEIN-I,BETA-2-GLYCOPROTEIN-I,PROTHROMBIN,PLASMA,ACTIVATED PROTEIN-C,LUPUS ANTICOAGULANTS,prothrombin,antibodies,alpha(2)-glycoprotein I,lupus anticoagulants,Thrombosis},
  language     = {eng},
  number       = {1},
  pages        = {185--196},
  publisher    = {Schattauer},
  title        = {Laboratory Detection of the Antiphospholipid Syndrome via Calibrated Automated Thrombography},
  url          = {http://dx.doi.org/10.1160/TH08-06-0393},
  volume       = {101},
  year         = {2009},
}

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