When Should an IVC Filter Be Used to Treat a DVT?

Due to the long-term complications of permanent IVC filters, it is suggested that a retrievable IVC filter be used for patients with temporary contraindications to anticoagulation.17 Comerata et al created a clinical decision-making tool for picking the type of filter to employ. If the duration of contraindication to anticoagulation is short or uncertain, a retrievable filter is recommended.18 Table 1 (p. 15) outlines the recommendations for IVC filter placement.

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(A) Stainless-steel Greenfield filter; (B) modified-hook titanium Greenfield filter; (C) bird’s nest filter; (D) Simon nitinol filter; and (E) Vena Tech filter.

There are no randomized controlled trials to guide the use of concomitant anticoagulation after filter insertion, although this intervention may be beneficial to prevent DVT propagation, recurrence, or IVC filter thrombosis.5 A meta-analysis of 14 studies evaluating the rates of VTE after IVC filter placement demonstrated a non-statistically significant trend toward fewer VTE events in the patients with an IVC filter and concomitant anticoagulation in comparison with those who solely had an IVC filter (OR 0.64, 95% CI, 0.35-1.2). The duration and degree of anticoagulation was not presented in all of the studies in the meta-analysis, therefore limiting the analysis.19

In addition to the ACCP guidelines, there have been other proposed indications for IVC filter use, including recurrent VTE despite anticoagulation, chronic recurrent PE with pulmonary hypertension, extensive free-floating iliofemoral thrombus, and thrombolysis of ilio-caval thrombus.20 The ACCP guidelines do not specifically address these individual indications, and at this time there are no randomized controlled trials to guide IVC filter use in these cases.

Back to the Case

Our patient developed a significant complication from anticoagulation. Current ACCP guidelines recommend an IVC filter if anticoagulant therapy is contraindicated (Grade 1C). The anticoagulation was discontinued and a retrievable IVC filter was placed. Once a patient no longer has a contraindication for anticoagulation, the ACCP recommends restarting a conventional course of anticoagulation. Thus, once the patient can tolerate anticoagulation, consideration will be given to removal of the retrievable filter.

Bottom Line

An IVC filter should be considered in patients with a DVT who have a contraindication to anticoagulation. Other indications for IVC filter use are not supported by the current literature. TH

Drs. Bhogal and Eid are hospitalist fellows and instructors at Johns Hopkins Bayview Medical Center in Baltimore. Dr. Kantsiper is a hospitalist and assistant professor at Bayview Medical Center.

References

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