[Value of velocimetric and echotomographic examination in monitoring central catheterizations].

Thrombosis around a centrally-implanted catheter is a complication of this method of venous approach. Usually asymptomatic, it is normally detected by phlebography, histopathology or computed angiotomography. Thirty-five patients with catheters in internal jugular vein composed of silicone (13 cases) or polyurethane (22 cases) were followed up by velocimetric and echotomographic examinations before introduction and one and three weeks after introduction of a catheter, these exploratory procedures possessing the advantage of being rapid, repetable and non-invasive. Three thrombosis were diagnosed using this method, including two without clinical signs, one on a silicone and two a polyurethane catheter. This represents 8.6% of total population, comparable with results of phlebography and histopathology reported in the litterature. The echotomographic appearance of the fibrinoplatelet sleeve left by the catheter after its removal is also described. Combined velocimetric and echotomographic examination is an investigational method which is non-invasive, reliable, rapid and repeatable for evaluation of appearance, localization, extension and also follow up of thrombosis.