Therapeutic Enoxaparin in the Morbidly Obese Patient: A Case Report and Review of the Literature.

Enoxaparin is a low molecular weight heparin commonly used in the treatment of venous thromboembolisms (VTEs); however, evidence on optimal empiric dosing recommendations are lacking in patients with morbid obesity. Utilization of an absolute dose cap, anti-Xa monitoring, and reduced empiric dosing are among the techniques used in this population. We describe a case of a morbidly obese man (body-mass index, BMI: 68.2 kg/m2, total body weight: 236 kg) who required therapeutic enoxaparin for suspected pulmonary embolism (PE) and critical limb ischemia as a bridge therapy during warfarin initiation. An initial empiric dose of 200 mg Q12 hours (0.85 mg/kg) resulted in an anti-Xa level of 1.01 IU/mL following the fifth dose, and no dose modification was deemed necessary. He experienced no adverse effects from treatment. This report adds to a growing body of evidence illustrating the need for reduced empiric weight-based doses of enoxaparin in the morbidly obese population and raises the question of whether dose capping is an appropriate practice in the clinical setting of morbidly obese patients with acute VTE.

Incorporating Comprehensive Management of Direct Oral Anticoagulants into Anticoagulation Clinics.

Anticoagulation clinics emerged as a means to optimize warfarin effectiveness and minimize bleeding risks. Anticoagulation clinics have traditionally been warfarin-based models due to the need for frequent blood-level monitoring, drug interactions, dietary considerations, and periprocedural management with warfarin. These models have demonstrated improved anticoagulation control and reduced bleeding complications for patients taking warfarin. Direct oral anticoagulants (DOACs) emerged with the perception of improved convenience due to the lack of blood-level monitoring and lack of dietary considerations. Despite the advantages of DOAC therapy, new challenges exist with their management, warranting ongoing monitoring. Such challenges include prescribing and dosing issues, drug adherence, drug interactions, and high drug cost. Comprehensive anticoagulation centers are needed to manage and monitor all oral anticoagulants including DOACs. The objectives of this review are to describe the challenges and opportunities that exist in the management of DOACs and to describe a practice model that integrates a DOAC management service into the traditional anticoagulation clinic.

Anticoagulation Bridge Therapy in Patients with Atrial Fibrillation: Recent Updates Providing a Rebalance of Risk and Benefit.

In 2011 we reviewed clinical updates and controversies surrounding anticoagulation bridge therapy in patients with atrial fibrillation (AF). Since then, options for oral anticoagulation have expanded with the addition of four direct oral anticoagulant (DOAC) agents available in the United States. Nonetheless, vitamin K antagonist (VKA) therapy continues to be the treatment of choice for patients who are poor candidates for a DOAC and for whom bridge therapy remains a therapeutic dilemma. This literature review identifies evidence and guideline and consensus statements from the last 5 years to provide updated recommendations and insight into bridge therapy for patients using a VKA for AF. Since our last review, at least four major international guidelines have been updated plus a new consensus document addressing bridge therapy was released. Prospective trials and one randomized controlled trial have provided guidance for perioperative bridge therapy. The clinical trial data showed that bridging with heparin is associated with a significant bleeding risk compared with not bridging; furthermore, data suggested that actual perioperative thromboembolic risk may be lower than previously estimated. Notably, patients at high risk for stroke have not been adequately represented. These findings highlight the importance of assessing thrombosis and bleeding risk before making bridging decisions. Thrombosis and bleeding risk tools have emerged to facilitate this assessment and have been incorporated into guideline recommendations. Results from ongoing trials are expected to provide more guidance on safe and effective perioperative management approaches for patients at high risk for stroke.