Supratherapeutic dabigatran: a cause of life‐threatening haemorrhage*

In this case report, we present a rare case of life-threatening gastrointestinal haemorrhage associated with deranged coagulation due to supratherapeutic levels of dabigatran. Dabigatran is a potent, synthetic, reversible non-peptide thrombin inhibitor which is increasingly used for stroke prevention in patients with non-valvular atrial fibrillation. It is generally accepted that dabigatran dosing does not require titration or the monitoring of plasma levels due to its predictable pharmacokinetics and pharmacodynamics. However, this case report challenges this viewpoint while identifying an important knowledge gap in relation to the effect of altered gastrointestinal motility on the absorption of direct oral anticoagulants. Furthermore, it demonstrates the successful use of high-dose idarucizumab in a critical care setting. Idarucizumab is a monoclonal antibody fragment that binds specifically to dabigatran and its metabolites, thereby reversing the anticoagulant effect.