00:01
So, the initial management for
lesions that are greater than 2 cm
are going to be surgical excision.
00:09
But remember, we need a well-
formed abscess to surgically excise it
and they do that with stereotactic aspiration.
00:18
And then,
empirical therapy is going to
be based on the predisposing condition.
00:24
The microscopy of abscess contents,
results of blood cultures,
and certainly many of these patients
would be given phenytoin to prevent seizures.
00:37
So, the initial management of a brain abscess
was going to be six to eight weeks of IV therapy,
followed by
most likely two to three months of oral treatment,
but it does depend.
00:49
If it's mixed infection,
we’re going to start
with high-dose IV penicillin.
00:54
You need the highest dose to
cross the blood-brain
barrier and penetrate the abscess
or maybe a third-generation cephalosporin.
01:02
And we’re going to
add metronidazole to that.
01:05
It gets spectacular levels in brain parenchyma
and it is probably the best agent
we have as a single agent for anaerobes.
01:17
If we know it’s Staph aureus
on the basis of the Gram stain,
we’re going to give
IV vancomycin until we find
out whether it's MRSA or not.
01:28
If it's not MRSA, we can back off
to a more narrow
spectrum nafcillin or oxycillin.
01:35
Now, if the patient
has a penicillin allergy,
we’re looking
at a cephalosporin
like ceftriaxone
which penetrates into the spinal fluid
better than other cephalosporins.
01:47
If it Pseudomonas aeruginosa
we’re talking about ceftazidime
or
cefepime
and the Gram stain would show you
myriads of gram-negative rods.
01:59
And so,
the gold standard is going to be six to eight weeks again of
IV therapy, followed by months.
02:08
Now, if it’s Nocardia,
we’re going to start with trim sulfa.
02:14
And the total duration of therapy is going to be
actually 12 months
for Nocardia.
02:21
If the patient
has a treatment failure,
we may have to add a carbapenem,
a third-generation cephalosporin,
minocycline or Linezolid.
02:31
If it's of unclear etiology,
we need vancomycin
to cover the staphylococci.
02:37
We need metronidazole
to cover the anaerobes.
02:40
And we need ceftriaxone to cover
the aerobic gram-negative rods.
02:45
If we’re worried about Pseudomonas,
then we would change
from ceftriaxone to cefepime
for that particular organism.
02:55
If it's a fungal brain abscess
and we have evidence of,
for example,
Candida,
we start out with liposomal
amphotericin B plus flucytosine.
03:06
And then when the
patient is stable or improving,
we switch over to fluconazole.
03:13
If it's Aspergillus or Scedosporium,
the drug of choice is
going to be voriconazole.
03:19
And that is given until there is absolutely
no evidence of a brain abscess.
03:27
For the zygomycetes,
we’re going to use –
and these are the bread molds,
the Rhizopus,
we’re going to be using amphotericin B.
03:36
And then,
after the patient has improved,
transitioning to an azole
known as posaconazole.
03:44
Some people suggest we
should use hyperbaric oxygen,
but the studies demonstrating the effectiveness
of this therapy are rather small,
and so that remains controversial.
03:58
For Toxoplasma gondii,
it's pyrimethamine plus
sulfadiazine for at least six weeks,
followed by suppressive therapy.
04:08
If the patient is allergic to sulfur drugs,
we use clindamycin.
04:12
For Taenia solium
causing cysticercosis,
this is controversial.
04:23
What you're looking at are the cysts,
the tissue cysts from cysticercosis.
04:31
And by the way,
if a Mexican immigrant comes into the United States
and has a first time seizure as an adult,
this is the most common cause of that.
04:46
So, cysticercosis should be suspected.
04:48
But at any rate, if this diagnosis is made,
you have to remember that some
of these cysts contain living organisms.
04:57
So, if you give them
something that would kill the organism,
you are going to create a tremendous
amount of inflammation and brain swelling.
05:07
So, the brain inside that solid
skull doesn't have any room to swell,
so you may actually cause
increased intracranial pressure and herniation.
05:17
So, it's very, very controversial as
to whether to treat it at least initially.
05:25
Most people recommend that you start albendazole or
or praziquantel and then
you give dexamethasone.
05:36
And that brings me to my conclusion
of speaking about brain abscess.