Left ventricular mural thrombus despite treatment with dabigatran and clopidogrel.

We describe a case with severe heart failure and moderate aortic stenosis. Due to previous atrial fibrillation and ischaemic heart disease, this patient was treated with both dabigatran and clopidogrel. Despite this, a large mural thrombus was found on echocardiography. The treatment was altered to warfarin, but the thrombus did not resolve during the next eight months.Guidelines for the use of anticoagulant treatment in left ventricular thrombus are needed. Previously, a few cases presenting resistance to novel oral anticoagulants have been published and cases with thrombus formation due to dabigatran have been described. Our patient showed resistance to both dabigatran and warfarin, and there was no thrombus resolution when changing the treatment to warfarin.