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- The Efficacy
of Mechanical
Abrasion and
Talc Slurry as
Methods of
Pleurodesis in
Normal Dogs: Veterinary
Surgery, Vol.
28, No. 5.
(1999), pp.
322-332.Object
ive To
determine the
efficacy of
mechanical
abrasion and
talc slurry as
methods for
pleurodesis in
normal dogs.
Study Design
Experimental
study. Animals
or Sample
Population Ten
normal beagle
dogs. Methods
Group I dogs
had mechanical
abrasion (MA)
of the
pulmonary and
costal pleurae
performed in
one hemithorax
with a dry
gauze sponge
with a median
sternotomy
approach.
Group II dogs
had 100 mL of
a 1 g talc
slurry (TS)
administered
into one
hemithorax
through a tube
thoracostomy.
Administration
of the TS was
visualized by
using video
thoracoscopy.
All dogs were
evaluated at
2, 10, 20, and
30 days
postoperativel
y by means of
thoracic
radiography
and
ultrasonograph
ic thoracic
wall
measurement.
The dogs were
euthanatized
30 days
postoperativel
y and a gross
necropsy was
performed.
Hemithoraces
were assigned
a pleurodesis
score (0-4)
and an
obliteration
grade (0-6).
Tissues were
collected for
histopathologi
c examination
of pulmonary
pleura, costal
pleura, and
pleural
adhesions.
Pulmonary and
costal pleurae
were graded
for the degree
of fibrosis
(0-4). Results
Obliteration
grade and
costal pleural
fibrosis score
were
significantly
higher for the
treated sides
in the MA dogs
compared with
the TS dogs.
MA Dogs
Mechanical
abrasion dogs
had
pleurodesis,
obliteration,
and pleural
fibrosis
scores that
were greater
on the treated
side than the
untreated
side, however,
the
differences
were not
statistically
significant.
Only two MA
dogs had firm
adhesion of
the pulmonary
pleura to the
costal pleura
in portions of
the cranial
and middle
lung lobes in
the treated
hemithorax.
Thoracic wall
surface area
covered with
adhesions was
15% and 21% in
each of these
two dogs. The
median
pulmonary
pleural
fibrosis score
of all MA dogs
for the
treated
hemithorax was
3 compared to
0 on the
untreated
side. TS Dogs
There was no
statistical
difference for
pleurodesis
scores and
obliteration
grades between
the treated
and untreated
sides. No dogs
showed
evidence of
pulmonary to
costal pleural
adhesions.
Histopathology
showed talc
crossover into
the untreated
side in all
five dogs.
Median
pulmonary
fibrosis score
of the treated
hemithorax was
1 compared
with 0 on the
untreated
side.
Conclusions
Neither method
of pleurodesis
produced
sufficient
pleural
adhesions to
obliterate the
pleural space.
It is possible
that the
degree of
pulmonary
pleural
fibrosis
present in MA
dogs may be
sufficient to
limit air
leakage from
pulmonary
blebs and
bullae
resulting in
successful
treatment of
spontaneous
pneumothorax.
Source: Veterinary Surgery, Vol. 28, No. 5. (1999), pp. 322-332.
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