Abstract | AIMS:
AZD0837 is a novel oral anticoagulant investigated in clinical studies for stroke prevention in patients with atrial fibrillation (AF). It is bioconverted to its active form, AR-H067637, a potent, specific and reversible thrombin inhibitor. The effects on coagulation biomarkers were correlated with the pharmacokinetic (PK) exposure of AR-H067637 to guide selection of the effective dose regimen for a confirmatory efficacy study in AF patients. METHODS: Blood samples were obtained from 601 AF patients randomized to one of four doses of AZD0837 (blinded treatment) or dose-adjusted vitamin K antagonists (VKA, open treatment) for 3-9 months. A pharmacodynamic model was developed to describe the time course of the AR-H067637 exposure dependent effects and the effect of VKA on fibrin D-dimer. The thrombin generation measured ex vivo in venous plasma was also investigated. RESULTS: The PK exposure of AR-H067637 was stable with an interindividual variability of 33% and no or minor influence of patient demographics or comedications. For AZD0837, D-dimer levels decreased with more rapid onset than for VKA. The decrease in D-dimer levels correlated with steady-state plasma concentrations (C(ss)) of AR-H067637, with a maximum decrease of baseline D-dimer levels estimated to approximately 60% for both AZD0837 and VKA therapy. The effect on thrombin generation correlated closely with the plasma concentration of AR-H067637. CONCLUSIONS: The effects on thrombin generation and fibrin D-dimer levels correlated with the plasma concentration of its active form and provided comparable effects to well-controlled VKA therapy at an exposure at least corresponding to the 300 mg once daily dose of AZD0837.
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Authors | Gregory Y H Lip, Lars H Rasmussen, S Bertil Olsson, Eva Jensen, Bengt Hamrén, Ulf G Eriksson, Karin Wåhlander |
Journal | British journal of clinical pharmacology
(Br J Clin Pharmacol)
Vol. 80
Issue 6
Pg. 1362-73
(Dec 2015)
ISSN: 1365-2125 [Electronic] England |
PMID | 26174611
(Publication Type: Clinical Trial, Phase II, Journal Article, Randomized Controlled Trial, Research Support, Non-U.S. Gov't)
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Copyright | © 2015 The British Pharmacological Society. |
Chemical References |
- AZD 0837
- Amidines
- Anticoagulants
- Azetidines
- Biomarkers
- Fibrin Fibrinogen Degradation Products
- fibrin fragment D
- Vitamin K
- Thrombin
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Topics |
- Administration, Oral
- Adult
- Aged
- Aged, 80 and over
- Amidines
(administration & dosage, pharmacology)
- Anticoagulants
(pharmacology)
- Atrial Fibrillation
(blood, drug therapy)
- Azetidines
(administration & dosage, pharmacology)
- Biomarkers
(blood)
- Female
- Fibrin Fibrinogen Degradation Products
(analysis)
- Humans
- Male
- Middle Aged
- Sex Characteristics
- Thrombin
(antagonists & inhibitors, biosynthesis)
- Vitamin K
(antagonists & inhibitors)
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