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Decentralization can interfere in the efficacy in capturing the embolus in vitro study

José Maria Pereira de Godoy, Alfredo Lara Gaillard

Med Sci Tech 2007; 48(2): RA95-96

ID: 881552

Introduction: Greenfield is one of the most important cava vena filters. However, there are some doubts regarding the interference in its positioning during implantation, not always occurring in centralized position. The main objective of the present study is to avail if the filter decentralization may interfere in the efficacy in capturing the embolus, in vitro study. Material and Methods: Lamb blood and silicon tubes of 3 mm diameter were used to build clots of 3 cm in length. The filter was introduced and fixed inside a transparent PVC tube of 2,2 cm internal diameter, vertically positioned and connected to a pulsatic flow system (peristaltic bomb). A parallel device with a tube connection, valve and syringe allowed the introduction of the embolus in the circuit. A reservoir for the solution completes the assembly. Saline solution (0,9%) with 40% of glycerin was utilized as a vehicle, at room temperature. A flow of 2,0 L/min was used and one hundred isolated clot releases were made with verification of their captures by the Greenfield filter in both centralized and decentralized positions. For statistical analysis a Fisher t test was utilized accepting an error alfa of 5%. Results: 10 failures occurred (10%) with the Greenfield centralized, 44 failures (44%) with the decentralized filter, being p = 0.0001. Conclusions: It is therefore concluded that the decentralization of the Greenfield cava vena filter, in an in vitro study, interferes in the efficacy of the embolus capture. (Clin Exp Med Lett 2007; 48(2): 95-96)

Keywords: Greenfield cava vena filter, evaluation,, centralized, decentralized

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