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[Follow-up of vena cava filters with color Doppler ultrasound]
Insights
Color-coded Duplex sonography effectively assesses Greenfield caval filter placement and vena cava condition. This imaging technique aids in diagnosing thrombosis and filter position, offering an alternative to traditional methods.
Area of Science:
- Vascular Surgery
- Diagnostic Imaging
- Interventional Radiology
Background:
- Inferior vena cava filters are crucial for preventing pulmonary embolism.
- Accurate assessment of filter placement and potential complications is essential for patient safety.
- Traditional imaging methods like cavography and CT scans have limitations.
Purpose of the Study:
- To evaluate the utility of color-coded Duplex sonography in assessing Greenfield caval filters.
- To determine if sonography can replace conventional imaging techniques for filter evaluation.
Main Methods:
- Color-coded Duplex sonography was performed in 49 patients post-Greenfield filter implantation.
- Plain film radiography of the abdomen was used adjunctively.
- Image quality and diagnostic findings were analyzed.
Main Results:
- Sonography was artifact-free in 84% of patients, visualizing filter position and venous flow.
- Caval thrombosis was detected in 5 patients.
- Filter malposition (decentral apex, tilting) was observed in 7 patients.
- Sonography could not detect filter strut penetration or morphological changes like fracture.
Conclusions:
- Color-coded Duplex sonography is a valuable, non-invasive tool for assessing caval filter position and detecting thrombosis.
- Combined with radiography, it can serve as an alternative to cavography and CT scans for evaluating filter placement and venous flow.
Abstract:
In 49 patients, colour-coded Duplex sonography was performed after implantation of a Greenfield caval filter. A plain film radiograph of the abdomen was taken additionally. The examination could be assessed free of artifacts in the longitudinal and transverse section in a total of 41 patients (84%). The procedure facilitates not only a diagnosis of thrombotic changes in the vena cava but can also display the topographical position of the filter and the venous flow. Caval thrombosis was verified in 5 patients. In 7 cases there was a decentral position of the filter apex with tilting. The penetration of filter struts through the vein wall eluded sonographic diagnosis as did morphological changes to the filter (e.g. filter fracture). In combination with the plain film radiograph, colour-coded Duplex sonography can replace cavography or computed tomography in the investigation of position and venous flow.