title: [Determining the effectiveness of percutaneous cava filters: experimental studies].
abstract: OBJECTIVE
  In vitro clot-trapping capacity of 16 different caval filters should be evaluated under varying experimental conditions.
  
  
  METHODS
  In a flow model simulating in vivo conditions (soft latex tube, dextran solution at 37 degrees C, pulsatile flow at a mean rate of 3 1/min) the efficiency of 16 caval filters was evaluated in horizontal and vertical position by using 640 or 1280 clots/filter (8 sizes). Non-self centering filters were tested in centric and in tilted position.
  
  
  RESULTS
  Efficiency of optimally centered caval filters varied between 97.8 and 69.4%. The largest thrombi were captured by all optimal centered filters. A change from vertical to horizontal position of the flow model resulted in a variation of filter efficiency by about 4.8%. Efficiency of non-self centering filters decreased significantly when placed in a tilted position (mean decrease 15.5%; range 2.7%-37.7%) resulting in a deterioration of the capture rate by as much as 43.2%.
  
  
  CONCLUSIONS
  Under optimal study conditions efficiency of all evaluated caval filters was high. Tilting of caval filters resulted in a significant efficiency decrease.
authors.affiliation: Klinik für Radiologische Diagnostik des Klinikums, Medizinischen Fakultät, RWTH-Aachen.
authors.forename: J
authors.initials: J
authors.lastname: Neuerburg
authors.forename: A
authors.initials: A
authors.lastname: Haupt-Pichler
authors.forename: F J
authors.initials: FJ
authors.lastname: Katterbach
authors.forename: R
authors.initials: R
authors.lastname: Eilers
authors.forename: T
authors.initials: T
authors.lastname: Siess
authors.forename: K
authors.initials: K
authors.lastname: Buro
authors.forename: C
authors.initials: C
authors.lastname: von Pichler
authors.forename: K
authors.initials: K
authors.lastname: Mottaghy
authors.forename: R W
authors.initials: RW
authors.lastname: Günther
mesh_terms: D000818:Animals; D004867:Equipment Design; D004868:Equipment Failure; D006801:Humans; D008955:Models, Cardiovascular; D011655:Pulmonary Embolism / Q000517:prevention & control; D011673:Pulsatile Flow; D013552:Swine; D016896:Treatment Outcome; D016306:Vena Cava Filters
vernacular_title: Bestimmung der Effektivität perkutaner Kavafilter: Experimentelle Untersuchungen.