B. Bachlijour et al., MORPHOMETRIC STUDY OF THE WALL OF THE CAUDAL VENA-CAVA AFTER IMPLANTATION OF A FILTER IN 15 EWES, ANAT HISTOL, 27(4), 1998, pp. 231-235
The long stabilizers of the VT-LGM filter rest on large areas of the v
ascular wall. The morphometric study of the layers of the vascular wal
l, after implantation of filter in 15 ewes, divided into 3 groups of f
ollow-up (2, 4 or 8 weeks) of 5 animals, was made at 3 levels opposite
the filter and 1 level outside of it. Changes are seen for all the la
yers. Filter produces intimal hyperplasia. Stabilizers are quickly iso
lated from the blood flow. The thickness of the intimal hyperplasia gr
ows for 4 weeks. It is more important at the base of the filter than a
t its head. There is also hyperplasia of the media with no change acco
rding to the follow-up or the level opposite the filter. The adventiti
a becomes thinner without variation of time or level of the filter. Sm
ooth muscle cells of the adventitia become less frequent and smaller.
Their density, in front of the stabilizers, is the smallest by 4 week
follow-up and remains the same along the stabilizer. The full thicknes
s of the wall is bigger opposite the stabilizers than between them. Th
e filter produces changes that are limited in time and in space. The m
ost important changes are seen at 4 weeks after insertion and opposite
the stabilizers.