Key result
Rivaroxaban combined with multiple CYP3A4 inhibitors linked to spontaneous hemopericardium and cardiac tamponade.
Why the study?
The pharmacology and metabolism of novel oral anticoagulants like rivaroxaban differ from vitamin K antagonists, and potential interactions with CYP3A4 inhibitors or inducers are underrecognized.
Case Report (n=1)
Highlights the critical need to evaluate potential drug interactions with CYP3A4 inhibitors when prescribing rivaroxaban to prevent severe bleeding complications.
Rivaroxaban-associated hemopericardium with tamponade warrants clinical vigilance; extends limited reports on rare bleeding events in nonvalvular AF.
Novel oral anticoagulants including the factor Xa inhibitor rivaroxaban are important alternatives to warfarin for the prevention of thromboembolic stroke in patients with nonvalvular atrial fibrillation. The pharmacology and metabolism of these agents differ from those of the vitamin K antagonists used over the decades preceding their introduction. We present a case of spontaneous hemopericardium and cardiac tamponade following administration of rivaroxaban. A review of the patient's medications revealed a total of seven agents known to be metabolized through cytochrome P450 3A4 (CYP3A4), the major pathway for rivaroxaban metabolism. While most physicians are familiar with recommendations to monitor renal function in patients prescribed rivaroxaban, we suspect that many fail to evaluate possible interactions with other agents having CYP3A4 inhibitory or inducer activity.
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Menendez et al. (2016) conducted a case report in Nonvalvular atrial fibrillation (n=1). Rivaroxaban and CYP3A4 inhibitors was evaluated on Spontaneous hemopericardium and cardiac tamponade. Administration of rivaroxaban in a patient taking multiple CYP3A4 inhibitors resulted in spontaneous hemopericardium and cardiac tamponade, highlighting the risk of drug-drug interactions.
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