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A phase-contrast MRI study of acute and chronic hydrodynamic alterations after hydrocephalus induced by subarachnoid hemorrhage.
[hydrocephalus with stenosis of the aqueduct of sylvius]
To
determine
acute
intracranial
hydrodynamic
changes
after
subarachnoid
hemorrhage
(
SAH
)
via
phase-contrast
MRI
(
PC
-MRI
)
analysis
of
the
CSF
stroke
volume
in
the
aqueduct
(
SVaq
)
and
the
foramen
magnum
(
SVfm
)
.
A
prospective
PC
-MRI
study
was
performed
on
34
SAH
patients
in
the
acute
and
late
phase
.
Data
on
CSF
flow
and
hemorrhage
site
were
analyzed
according
to
acute
or
chronic
hydrocephalus
(
HC
)
.
In
the
acute
phase
,
CSF
analysis
was
performed
for
31
patients
,
12
of
whom
presented
HC
.
All
12
had
an
abnormal
SVaq
;
those
with
communicating
HC
(
n
 
=
7
)
had
an
elevated
SV
and
those
with
noncommunicating
HC
(
n
 
=
5
)
had
a
nil
SV
.
None
of
the
patients
with
a
normal
SVaq
(
n
 
=
11
)
developed
acute
HC
.
Intraventricular
bleeding
led
to
more
cases
of
acute
HC
(
P
 
=
.
005
)
,
which
was
communicating
in
58
%
of
cases
.
In
the
chronic
phase
,
CSF
analysis
was
performed
for
27
patients
,
7
of
whom
presented
HC
.
None
of
these
7
patients
displayed
a
depressed
SVaq
.
SAH
led
to
changes
in
cerebrospinal
fluid
hydrodynamics
in
the
majority
of
patients
.
Acute
HC
was
communicating
in
most
cases
,
even
when
there
was
intraventricular
bleeding
.
In
the
late
phase
,
all
chronic
HC
were
communicating
and
did
not
display
aqueductal
stenosis
.
