Update on the diagnosis and management of pulmonary embolism

Improving Inferior Vena Cava Filter Retrieval and Success Rates Using an Office Endovascular Center

BACKGROUND

The Food and Drug Administration recommends that retrievable inferior vena cava filters (IVCFs) be removed 29-54 days postinsertion. Nationally, the retrieval rate is around 23-25%. The objectives of this study are to assess the effect of a plan for IVCF retrieval and access to an office endovascular center (OEC) on filter removal rates and to assess the safety of the procedure in an OEC.

METHODS

In this institutional review board-exempt retrospective study, the medical records of all patients who had an IVCF placed or removed in the hospital and OEC setting by one group of vascular surgeons between January 2011 and February 2017 were analyzed. Informed consent was not required for this retrospective chart review. The following data were abstracted: filter model, procedure site, retrieval plan, number of removal attempts, complications attributed to removal, success of removal, and the duration that the filter was in place. Anticoagulation was not discontinued before filter retrieval. Filters were removed under local anesthesia with or without mild conscious sedation.

RESULTS

IVCF removal was attempted in all eligible patients, 120 of 191 with IVCFs, whereas 71 patients were lost to follow-up (46), died (19), or the indication changed (6). Of the patients who had filters placed in the hospital (n = 161), 62% were removed (n = 101), of which 86% had a removal attempt in the OEC, whereas 14% had the filter removed in the hospital. Sixty-three percent of patients who had filters placed in the OEC (n = 30) had the filter removed in the OEC (n = 19). All patients with a newly placed filter were given an office appointment with a vascular surgeon for evaluation and removal planning. Of patients who had their filter removed at the OEC, all were removed via the jugular approach, resulting in 103 of 106 (97%) successful removals in the OEC. Visipaque (GE Healthcare, Chicago, IL) contrast was used during filter removal. Intravascular ultrasound was not used because the study predates the insurance coverage of this technology in the office laboratory. There was no mortality related to filter removal. In addition, there were no bleeding complications, despite patients remaining on anticoagulant therapy during the removal. In 4% of patients, the filter was removed in less than 3 weeks, 30% of patients between 3 and 6 weeks, 26% of patients between 6 weeks and 3 months, and 40% of patients after 3 months.

CONCLUSIONS

Having access to both an OEC and a documented retrieval plan increases the frequency of IVCF removal in a community compared with national rates. Retrievable filters can be safely removed in an OEC with extremely high success and safety. Anticoagulation therapy can be continued during retrieval attempt without increased risk of bleeding.

Direct Oral Anticoagulants for the Management of Thromboembolic Disorders

Anticoagulation therapy is central to the management of thromboembolic disorders, and the use of direct oral anticoagulants offers several advantages over standard therapy with parenteral heparins and vitamin K antagonists. In phase III clinical trials, the direct oral anticoagulants (given once or twice daily) all demonstrated favorable benefit–risk profiles compared with conventional standard therapy for the treatment and secondary prevention of venous thromboembolism and for stroke prevention in patients with nonvalvular atrial fibrillation. In clinical practice, many factors may influence overall clinical outcomes in patients receiving anticoagulant therapy, including adherence and persistence to the prescribed therapy, which becomes particularly important during long-term therapy. When choosing an anticoagulant for an individual patient, the pharmacological and clinical profile of the anticoagulant, its dosing regimen, and the patient’s clinical characteristics (eg, renal function and comorbidities) and preferences should be considered. This review examines the rationale for and clinical evidence of the selected dosing regimens of the direct oral anticoagulants for the treatment of venous thromboembolism and stroke prevention in nonvalvular atrial fibrillation. The potential influence of dosing strategies (eg, once- or twice-daily dosing) and other factors on patient adherence and therapy persistence are also discussed.

The potential of target-specific oral anticoagulants for the acute and long-term treatment of venous thromboembolism

BACKGROUND

Venous thromboembolism (VTE) comprises both deep vein thrombosis and pulmonary embolism. VTE is a leading cause of morbidity and mortality worldwide and its increasing incidence and prevalence are a major health concern. The primary medical objective during the acute phase of VTE treatment is to prevent thrombus extension and embolization. Extended treatment aims to prevent or minimize long-term complications, such as recurrent VTE, post-thrombotic syndrome and chronic thromboembolic pulmonary hypertension.

SCOPE

Anticoagulant therapy has been the mainstay of treatment for VTE and traditionally involves initial therapy with heparin, overlapping with and followed by a vitamin K antagonist. Although effective, standard heparin/vitamin K antagonist therapy has several limitations that can be overcome by more recently developed target-specific oral anticoagulants (TSOACs). These agents have predictable pharmacokinetics, a rapid onset of action and few drug-drug or drug-food interactions. Furthermore, TSOACs offer convenient anticoagulation without the need for routine coagulation monitoring and dose adjustment.

FINDINGS

The efficacy and safety data from phase III clinical trials support the use of TSOACs for VTE treatment, including in special patient populations. Risk-stratification tools and strategies have been developed to assist physicians in managing anticoagulation treatment.

CONCLUSIONS

Rivaroxaban is the first TSOAC to gain widespread approval for the treatment of acute deep vein thrombosis and pulmonary embolism and the long-term prevention of recurrent VTE as monotherapy. Dabigatran has also been approved for this indication recently. TSOACs, especially as monotherapy, represent a paradigm shift in clinical practice for the management of patients with VTE.

Deep vein thrombosis and pulmonary embolism - Prevention, management, and anaesthetic considerations

There is high incidence of venous thromboembolism, comprising of deep vein thrombosis and pulmonary embolism, in hospitalized patients. The need for systemic thromboprophylaxis is essential, especially in patients with inherited or acquired patient-specific risk factors or in patients undergoing surgeries associated with high incidence of postoperative deep vein thrombosis and pulmonary embolism. These patients, on prophylactic or therapeutic doses of anticoagulants, may present for surgery. General or regional anaesthesia may be considered depending on the type and urgency of surgery and degree of anticoagulation as judged by investigations. The dilemma regarding the type of anaesthesia can be solved if the anaesthesiologist is aware of the pharmacokinetics of drugs affecting haemostasis. The anaesthesiologist must keep abreast with the latest developments of methods and drugs used in the prevention and management of venous thromboembolism and their implications in the conduct of anaesthesia.

Treatment of Pulmonary Embolism Using Ultrasound-Accelerated Thrombolysis Directly Into Pulmonary Arteries

Traditional therapy for pulmonary embolism includes systemic anticoagulation, systemic thrombolysis, catheter-directed thrombolysis / suction catheter thrombectomy, and surgical thromboembolectomy. Currently, the standard treatment for submassive and massive pulmonary embolism involves the use of systemic anticoagulation. However, unlike systemic anticoagulation there is no standard treatment algorithm for the use of thrombolytics to aggressively treat pulmonary embolism and its sequelae. This case report discusses the successful use of thrombolytics using the EKOS EkoSonic Ultrasound-Accelerated Thrombolysis System in the treatment of bilateral submassive pulmonary emboli along with a saddle pulmonary embolus. The EKOS ultrasound-accelerated thrombolysis procedure resulted in rapid substantial clinical improvement, resolution of bilateral pulmonary emboli along with resolution of the saddle pulmonary embolus, restoration of pulmonary blood flow with resolution of pulmonary hypertension, and normalization of pulmonary embolism-related cardiac dysfunction. This novel application of ultrasound-accelerated thrombolytic infusion directly into the pulmonary arteries for pulmonary embolism provides a potential new treatment option and a valuable addition to the treatment algorithm for the management of both submassive and massive pulmonary embolism.

Recent Publications on Medications and Pharmacy

Hospital Pharmacy presents this new feature to keep pharmacists abreast of new publications in the medical/pharmacy literature. Articles of interest will be abstracted monthly regarding a broad scope of topics.