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        Impact of lipoprotein apheresis on thrombotic parameters in patients with refractory angina and raised lipoprotein(a) : Findings from a randomized controlled cross-over trial

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        Impact_of_LA_on_Thombosis_in_RA_and_raised_Lp_a_JClinLip_with_revisions.pdf (PDF, 801Kb)
        Author
        Khan, Tina Z.
        Gorog, Diana A.
        Arachchillage, Deepa J.
        Ahnström, Josefin
        Rhodes, Samantha
        Donovan, Jacqueline
        Banya, Winston
        Pottle, Alison
        Barbir, Mahmoud
        Pennell, Dudley J.
        Attention
        2299/21668
        Abstract
        Background: Raised lipoprotein(a) [Lp(a)] is a cardiovascular risk factor common in patients with refractory angina. The apolipoprotein(a) component of Lp(a) exhibits structural homology with plasminogen and can enhance thrombosis and impair fibrinolysis. Objectives: The objective of the study was to assess the effect of lipoprotein apheresis on markers of thrombosis and fibrinolysis in patients with high Lp(a). Methods: In a prospective, single-blind, crossover trial, 20 patients with refractory angina and raised Lp(a) > 50 mg/dL were randomized to three months of weekly lipoprotein apheresis or sham. Blood taken before and after apheresis/sham was assessed using the Global Thrombosis Test, to assess time taken for in vitro thrombus formation (occlusion time) and endogenous fibrinolysis (lysis time), as well as von Willebrand Factor, fibrinogen, D-dimer, thrombin/anti-thrombin III complex, prothrombin fragments 1 + 2, and thrombin generation assays. Results: Lp(a) was significantly reduced by apheresis (100.2 [interquartile range {IQR}, 69.6143.0] vs 24.8 [17.2,34.0] mg/dL, P =.0001) but not by sham (P =.0001 between treatment arms). Apheresis prolonged occlusion time (576 ± 116 s vs 723 ± 142 s, P <.0001) reflecting reduced platelet reactivity and reduced lysis time (1340 [1128, 1682] s vs 847 [685,1302] s, P =.0006) reflecting enhanced fibrinolysis, without corresponding changes with sham. Apheresis, but not sham, reduced von Willebrand Factor (149 [89.0, 164] vs 64.2 [48.5, 89.8] IU/dL, P =.0001), and fibrinogen (3.12 ± 0.68 vs 2.20 ± 0.53 g/L, P <.0001), and increased prothrombin fragments 1 + 2 (158.16 [128.77, 232.09] vs 795.12 [272.55, 1201.00] pmol/L, P =.0006). There was no change in D-dimer, thrombin/anti-thrombin III complex, or thrombin generation assay with apheresis or sham. Conclusion: Lipoprotein apheresis reduces Lp(a) and improves some thrombotic and fibrinolytic parameters in patients with refractory angina.
        Publication date
        2019-09-01
        Published in
        Journal of Clinical Lipidology
        Published version
        https://doi.org/10.1016/j.jacl.2019.06.009
        Other links
        http://hdl.handle.net/2299/21668
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