Northwestern Radiology IVC Filter Clinic

Likelihood of retrieval calculator

Likelihood that an optional filter becomes permanent: 21%

Patient parameters

• Age
• Gender
• Prior history of VTE (documented in medical history at time of filter placement)
• Presence of neurological disease (defined as stroke, paraplegia, quadriplegia, Parkinson.s disease, and Alzheimer.s disease)
• Presence of malignancy

Indication for filter placement parameter was subdivided into five categories

• VTE with anticoagulation (AC) contraindication
• VTE with AC complication
• VTE with AC failure (prolonged post operative immobilization, morbid obesity, family history of thrombophilia, current hormonal therapy, significant medical comorbidities i.e., COPD, cardiac ischemia, etc)
• High risk VTE
• Prophylaxis

Patients were assigned one, and only one, category for placement indication.