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[Vena cava filter. Indications, complications, clinical evaluation]
T Helmberger1, R Helmberger, N Holzknecht
1Institut für Radiologische Diagnostik, Klinikum Grosshadern, Ludwig-Maximilians-Universität München.
Insights
Pulmonary embolism (PE) is a leading cause of death. Vena cava filters offer an alternative when anticoagulation fails, but their efficacy requires careful consideration due to potential complications like caval thrombosis.
Area of Science:
- Vascular Surgery
- Interventional Radiology
- Cardiology
Background:
- Pulmonary embolism (PE) is a significant cause of mortality in Western countries.
- Anticoagulation therapy is the primary treatment for PE.
- Vena cava filters are an alternative when anticoagulation is contraindicated or fails.
Purpose of the Study:
- To review the types, efficacy, and complications of vena cava filters.
- To evaluate the clinical utility of percutaneously implanted vena cava filters.
Main Methods:
- Classification of vena cava filters by design, material, and removability.
- Analysis of in vitro efficacy and complication rates (caval thrombosis, filter fracture).
Main Results:
- No significant differences in trapping efficacy among filter types in clinical practice.
- Approximately 4% of patients treated with filters still experience PE; 1% have fatal outcomes.
- Caval thrombosis is the most common complication, occurring in up to 25% of cases, depending on filter type.
Conclusions:
- Percutaneous implantation of vena cava filters is feasible for interventional radiologists.
- Randomized clinical studies have not conclusively demonstrated the efficacy of vena cava filters.
- Careful consideration of filter indication is necessary due to limited proven efficacy and potential complications.
Introduction:
Pulmonary embolism is the third leading cause of death in the western countries. If anticoagulation fails or is contra-indicated, or if the risk for pulmonary embolism is increased for other reasons, the percutaneous implantation of a vena cava filter should be considered.
Methods:
The available filters can be differentiated by the design (cone, basket, net-types), by the material, and by their removability. The rate of complications (caval thrombosis, fracture of filter) and the in vitro efficacy in trapping thrombotic clots is dependent on the specific filter type.
Results:
In clinical practice there is no evidence for significant differences in trapping efficacy among the different filters. About 4% of all patients treated by caval filters still can have pulmonary embolism, and 1% will have a fatal outcome. Dependent on the filter type, the most common complication is caval thrombosis, in up to 25% of cases.
Conclusion:
The percutaneous implantation of caval filters can readily be performed by interventional radiologists. However, randomized clinical studies failed to clearly document efficacy of caval filters. Therefore, indication has to be considered carefully.