Ovid- Current Treatment of Brain Abscess in Patients With Congenital Cyanotic Heart Disease.

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[Clinical Studies]

Neurosurgery

Issue: Volume 41(6), December 1997, pp 1270-1279

Copyright: Copyright by the Congress of Neurological Surgeons

Publication Type: [Clinical Studies]

ISSN: 0148-396X

Accession: 00006123-199712000-00006

Keywords: Brain abscess, Cyanotic heart disease, Infection, Mortality

Current Treatment of Brain Abscess in Patients with Congenital Cyanotic Heart Disease

Takeshita, Mikihiko MD; Kagawa, Mizuo MD; Yato, Seiji MD; Izawa, Masahiro MD; Onda, Hideaki MD; Takakura, Kintomo MD; Momma, Kazuo MD

Author InformationDepartment of Neurosurgery, Neurological Institute (MT, MK, SY, MI, HO, KT), and Department of Pediatric Cardiology (KM), The Heart Institute of Japan, Tokyo

Women's Medical College, Tokyo, Japan

Received, August 13, 1996.

Accepted, July 16, 1997.

Reprint requests: Mikihiko Takeshita, M.D., Department of Neurosurgery, Neurological Institute, Tokyo Women's Medical College, Kawada-cho 8-1, Shinjuku-ku,

Tokyo 162, Japan.

Abstract

OBJECTIVE: The goal of this study was to define clearly the role of management in patients with cyanotic heart disease and brain abscesses by evaluating

retrospectively the factors influencing poor outcome in these patients.

METHODS:This study included 62 patients with cyanotic heart disease and brain abscesses diagnosed in the computed tomography era. Basic

characteristic parameters (number, size, location, computed tomographic classification and organism type of abscess, convulsion, type of cyanotic heart

disease, age distribution, immunocompromised status, pretreatment neurological state, and intraventricular rupture of brain abscess [IVROBA]) and

therapeutic parameters (type of antibiotics and duration of administration, steroid medication and therapeutic modalities, aspiration with or without

cerebrospinal fluid drainage, total extirpation after aspiration, or primary extirpation and medical treatment) were evaluated as independent predictors of

poor outcome (totally disabled state or death) by using univariate and multivariate logistic regression analysis. We also statistically estimated the possible

causes of IVROBA and the multiplicity of brain abscess.

RESULTS:Although there were no statistically significant correlations between patients with good and poor outcomes in regard to other basic characteristic

and therapeutic parameters, patients with poor outcomes were older(P< 0.02), more frequently had IVROBA (P< 0.005), and had a higher frequency of

neurological deterioration (P< 0.01) than those with good outcomes. Multiple logistic regression analysis predicted that poor outcome increased the relative

risk of IVROBA by a factor of 18.9 (odds rate, 18.9; 95% confidence interval, 1.7-211.6;P< 0.02). More patients with multiple abscesses had positive

immunocompromised states than those with single abscesses (P< 0.01). Deep-located abscesses also more frequently had IVROBA (P< 0.005) and

abscesses located in the parieto-occipital region ruptured into the occipital horn of the lateral ventricle in a short period(P< 0.02).

CONCLUSIONS: Our findings suggest that IVROBA strongly influences poor outcome in patients with cyanotic heart disease. The key to decreasing poor

outcomes may be the prevention and management of IVROBA. To reduce operative and anesthetic risk in these patients, abscesses should be managed by

less invasive aspiration methods guided by computed tomography. Abscesses larger than 2 cm in diameter, in deep-located or parieto-occipital regions,

should be aspirated immediately and repeatedly, mainly using computed tomography-guided methods to decrease intracranial pressure and avoid IVROBA.

IVROBA should be aggressively treated by aspiration methods for the abscess coupled with the appropriate intravenous and intrathecal administration of

antibiotics while evaluating intracranial pressure pathophysiology.

Because computed tomography (CT) facilitates early detection, accurate characterization, and evaluation of brain abscesses and intracranial pressure

pathophysiology, the combination of surgical and medical management has dramatically reduced the mortality rates f rom 40 to 60% (3,6,23,25)in the pre-CT

era to the current rates of 0 to 10% (17,23,28,35,37). The application of stereotactic aspiration using CT for deep-seated or multiple abscesses in recent years

has also improved mortality and morbidity rates (8,13,17,31,33).

Patients with brain abscess and congenital cyanotic heart disease, however, possess not only cardiopulmonary risk but also a wide variety of coagulation

defects. Together, these factors increase the risks of anesthesia and surgery (9,20,27,32). Radford et al. (22)and Radford and Thong (21)also demonstrated

that children with congenital heart disease have variable degrees of immunodeficient states.

Cyanotic brain abscesses caused by hematogenous dissemination from a primary silent infected focus are often deep-seated and located at the junction of

white and gray matter. The capsule is generally thin on the ventricle side compared with the portion near the cortical surface (30). Consequently, the growth of

the abscess may cause a rupture into the ventricles accompanied with mass e!ect. Even today, intraventricular rupture of brain abscess (IVROBA) continues to

be associated with a high mortality rate (38).

Despite improvements in imaging techniques and in surgical and medical management with newly developed antibiotics, the mortality rate for cyanotic brain

abscess (20)is 13.3%, even in the CT era. Because these patients have unstable hemodynamic conditions and coagulation disorders and the brain abscesses

may easily rupture into the ventricle, there is much controversy over the best way of treating these patients. For example, the number, location, and size of the

brain abscesses that should be surgically excised or aspirated (24,26)and the exact duration of antibiotic therapy and the relative role of corticosteroids remain

unclear. The abscess diameter on the necessity of repeated aspiration and the need for placement of the ventricular drainage when the abscess has ruptured

into the ventricle are also a matter of argument (38). There is little information available to guide the management of patients with cyanotic brain abscess, and

the management of these patients has been subjective to greater variability.

Ovid: Current Treatment of Brain Abscess in Patients with C... http://ovidsp.tx.ovid.com.ezp.lib.unimelb.edu.au/sp-3.18.0b/o...

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We reported in 1983 on 62 patients with brain abscess and congenital cyanotic heart disease in both the pre-CT and CT eras (12). We predicted in that article

that the number of patients cured by aspiration with intravenous antibiotics administration would increase after the introduction of CT. We have used the

therapeutic modality of repeating aspiration of abscesses concomitantly combined with the administration of intrathecal and intravenous antibiotics after

IVROBA in the CT era. To establish the best management for cyanotic brain abscess, we statistically determined the basic characteristics and therapeutic

factors influencing outcome in these patients in the CT era and the optimal management of these problematic lesions and demonstrated the basic

characteristics of total cyanotic brain abscess in both the pre-CT and CT eras.

PATIENTS AND METHODS

From May 1969 to April 1995, 149 patients with brain abscesses were treated at the Department of Neurosurgery, Neurological Institute, Tokyo Women's

Medical College. Of these 149 patients, 103 (69.1%) had congenital cyanotic heart disease. These patients included five with tetralogy of Fallot, who

developed new abscesses in another region after resolution of the initial abscesses after 3 to 5 years. All patients in this series had abscesses before radical

operation for the heart disease. Thirty-nine patients received palliative shunts (Blalock-Taussing anastomosis in 33 patients, Waters anastomosis in 3, Glenn's

operation in 1, and atrioseptostomy in 2) for the heart disease at ages of 0.3 to 11 years. The brain abscesses developed between 1 month and 29 years

(mean, 8.9 yr) after a palliative shunt.

Between 1969 and 1975, CT was not yet routinely used. Stereotactic aspiration procedures guided by CT for high-risk locations or multiple abscesses as

variable treatment options became available from 1984 onward.

Basic characteristics of total cyanotic brain abscess in the pre-CT and CT eras (Table 1)

TABLE 1. Initial Symptoms and Clinical Characteristics in 103 Patients with Cyanotic Brain Abscessesa


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Of the 103 patients, 39 were female and 64 were male patients. Their ages ranged from 1 to 56 years, and 58 patients were 10 years old or younger. The most

common form of congenital cyanotic heart disease was tetralogy of Fallot in 57 patients, and the next most common were complete transposition of the great

arteries in 12 and double outlet of the right ventricle in 10. The most common clinical features were symptoms and signs of raised intracranial pressure,

together with pyrexia. The main localizing sign was hemiparesis, and epileptic seizure occurred in 48 patients (46.6%). Sixty-seven patients developed

disturbed consciousness, but semicoma occurred in only 6.8%.

Most abscesses were located supratentorially, and 19.4% were multiple abscesses. Each of 83 patients had a solitary abscess, including 12 multilocular

lesions. Each of 14 patients had two separate lesions, each of 5 patients had three discrete abscesses, and 1 patient harbored five discrete abscesses.

Information concerning the bacteriology of the cyanotic brain abscess was not fully available during the first 3-year investigational period. Thirty-nine of 76 pus

cultures (51.3%) showed microorganisms, with single organisms in 30 patients and mixed infection in 9 patients. During the period from 1971 to 1995,

anaerobic organisms (in pure or mixed culture) were isolated in 17 patients (22.4%). The most common aerobic bacteria wereStaphylococcusspecies,

Streptococcusspecies, and Gram-positive cocci, whereas the most common anaerobic bacteria werePeptostreptococcus. Blood cultures in 39 patients were

mostly sterile (89.8%), and microorganisms of the brain abscesses matched those of the blood cultures in only two patients.

Basic characteristics of cyanotic brain abscess in the CT era (Table 2)

TABLE 2. Brain Abscesses in Patients with Congenital Cyanotic Heart Disease (Computed Tomography Era)


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We statistically determined the basic characteristics and therapeutic factors influencing outcome in 62 patients with cyanotic brain abscesses in the CT era. Of

the 62 patients, 24 were female and 38 were male patients. Their ages ranged from 1 to 56 years. The staging of brain abscess by Britt and Enzmann (4), which

correlates histological features of brain abscess, demonstrated late cerebritis in 31 patients and early or late capsule in 31 patients. Pretreatment neurological

state was classified as alert state and/or mild deficit, lethargic state and moderate deficit, or obtunded state and marked deficit.

Treatment and complications

[beta]-Lactam antibiotics were administered intravenously and immediately to all patients to avoid IVROBA. Determining the appropriate bacteriocidal

antibiotics, with the spectrum narrowed, depends on the sensitivity of the microbial organism, which is generally identified within 48 to 72 hours. The duration

of antibiotic therapy was not influenced by the number of abscesses or whether patients underwent surgical or medical therapy. In patients who did not

undergo surgery and in whom the microorganism was unidentified, antibiotic therapy was based on results from blood culture or drugs were chosen

empirically. Only seven patients with severely disturbed consciousness received corticosteroids to reduce brain edema, with administration lasting less than 7

days.

We selected conservative treatment using antibiotics for patients with abscesses smaller than 2 cm in diameter. These patients underwent surgery if 1 week of

therapy failed to demonstrate clinical or radiographic improvement. Abscesses larger than 2 cm in diameter and caus ing significant mass e!ect were treated

surgically, mainly using aspiration methods. When we aspirated individual abscesses, 50 to 80% of their volumes were removed (Fig. 1). Repeated aspiration

was required when abscesses did not decrease to smaller than 2 cm in diameter after 2 weeks of antibiotic therapy. Two or three aspiration procedures were

generally su"cient.

FIGURE 1.A, contrast-enhanced computed tomographic scans of the head showing a ring-enhancing multilocular brain abscess at the right frontal lobe in a 23-year-old

man with the single ventricle. B, contrast-enhanced computed tomographic scans of this patient showing residual brain abscess after stereotactic aspiration.

When a cyanotic brain abscess ruptured into the ventricle, we first chose medical treatment for the abscess, evaluating the abscess and intracranial pressurepathophysiology by performing weekly CT. We secondarily treated the abscesses that were larger than 2 cm in diameter accompanied with dilated ventricles

by aspiration of the abscesses and ventricular drainage coupled with the administration of appropriate intravenous and intrathecal (mainly gentamycin)

antibiotics (Fig. 2). Although the administration of intrathecal antibiotics with intermittent or continuous spinal drainage was limited to patients with abscesses

smaller than 1.5 cm in diameter with the capsule separated from the ventricle, we had no cases of subsequent IVROBA with this treatment. We do not

stereotactically aspirate the small cyanotic brain abscess (


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Although complications from broad spectrum antibiotics included sepsis caused by fungal superinfection in one patient with depressed immune response,

there were no patients with pseudomembraneous colitis. Although three patients had intracapsular hematomas after aspiration and were treated

conservatively, none died as a result of the hematomas. One patient with IVROBA, however, had intracapsular and intraventricular hematomas after aspiration

and ventricular drainage and died as a result of uncontrollable ventriculitis.

Statistical analysis

Statistical analysis was performed using the SPSS package (26). In univariate analysis, the [chi]2or Fisher's exact test was used to compare proportions.

Multiple logistic regression models were used to test and quantify relations independent of possible theoretical risk factors influencing poor outcome (totally

disabled state or death). We then performed a multivariate logistic regression analysis to determine whether any of the variables determined to be related in the

univariate analyses (P< 0.1) would be independently related to exclusion from this study. Only factors with a potential relationship to dependent variates were

included in the model. The odds rates(OR) with 95% confidence intervals (95% CIs), which were estimated using the standard errors, were calculated by

logistic regression before and after adjustment for potential confounding variables. Significance was judged at the P< 0.05 level.

RESULTS

Basic characteristics and therapeutic factors influencing outcome of brain abscess

The clinical features and treatment in patients with cyanotic brain abscesses with good versus poor outcomes in the CT era are compared in Table 2. Patients

with poor outcomes were older(P< 0.02), more frequently had IVROBA (P< 0.005), and had a higher frequency of neurological deterioration (P< 0.01) than

those with good outcomes. There was no statistically significant correlation between patients with good and poor outcomes with respect to the number, size,

computed tomographic classification, organism type of abscess, convulsion, type of cyanotic heart disease, or immunocompromised status. Patients with

poor outcomes had deep-located abscesses more often than patients with good outcomes, but this di!erence was not significant.

Therapeutic factors such as the type of antibiotics and duration of administration, steroid medication, and therapeutic modalities were not statistically

significant as collected in patients with poor or good outcomes. Only factors with a potential relationship to dependent variates were included in the

multivariate logistic regression model (age distribution, abscess in the noneloquent versus eloquent locations, IVROBA, and pretreatment neurological grade).

IVROBA occurred more frequently in patients with poor outcomes. The logistic regression analysis determined that poor outcome increased the relative risk ofIVROBA by a factor of 18.9 (OR, 18.9; 95% CI, 1.7-211.6, P< 0.02).

Patients with poor outcomes were statistically significantly older than patients with good outcomes. Patients older than 21 years , however, did not have a

higher relative risk than patients aged 11 to 20 years (OR, 1.8; 95% CI, 0.39-8.8). Patients aged 11 to 20 years were also less likely to have poor outcomes than

patients younger than 10 years (OR, 0.2; 95% CI, 0.06-1.1).

Although patients with poor outcomes more frequently had abscesses in the eloquent area than those with good outcomes, logistic regression analysis

demonstrated that the former did not have a relatively higher risk of such abscesses. Patients with poor outcomes had a high frequency of neurological

deterioration. Obtunded state and marked neurological deficit did not predict poor outcome more than lethargic state and moderate neurological deficit (OR,

0.8; 95% CI, 0.2-2.8). Patients with alert state and/or mild neurological deficits also did not have poorer outcomes than patients with lethargic status and

moderate neurological deficits (OR, 0.3; 95% CI, 0.06-2.0).

Number of abscesses (single versus multiple abscess) and clinical features

Table 3demonstrates the relationship between single and multiple abscesses in these patients. Although more patients with multiple abscesses were

immunocompromised than patients with single abscesses(P< 0.01) and more frequently had IVROBA (P< 0.005), there was no statistically significant

correlation between patients with multiple abscesses and single abscesses with respect to other clinical features and outcome.


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TABLE 3. Relationship between Single and Multiple Abscesses in Patients with Congenital Cyanotic Heart Disease (Computed Tomography Era)

IVROBA in the CT era

Table 4shows the clinical features in cyanotic brain abscesses patients with and without IVROBA. IVROBA occurred in 21 patients(33.9%), resulting in fourdeaths and one poor outcome, whereas the mortality rate of patients without IVROBA was 7.3%. There were no significant di!erences in the size, number,

computed tomographic classification of abscess, or type of cyanotic heart disease between patients with and without IVROBA, although deep-located

abscesses more frequently ruptured intraventricularly (P< 0.005).


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TABLE 4. Clinical Features of Intraventricular Rupture of Cyanotic Brain Abscess in the Computed Tomography Eraa

Even in the CT era, 17 patients had IVROBA before being referred to the Department of Neurosurgery of the Tokyo Women's Medical College and 4 patients

had IVROBA during their stay in our clinic. Relationships between the ventricular site at which an abscess ruptured and the span from initial symptom to

IVROBA are compared in Table 5. Abscesses located in the parieto-occipital region may rupture into the occipital horn of the lateral ventricle in a short period

(P< 0.02).

TABLE 5. Relationship between the Portion of Intraventricular Rupture of Brain Abscess and a Span from the Beginning of Symptomatologya

Convulsion and anticonvulsants

Anticonvulsants were administered to all patients diagnosed with brain abscess. All patients received anticonvulsants for periods ranging from 6 months to 10

years. The incidence of seizure was 44% at presentation (versus 51% in the pre-CT era), 11% during treatment (versus 2.4% in the pre-CT era), and 37% in

the CT era (versus 30% in the pre-CT era). There were no significant di!erences between the incidence of seizure in the pre-CT era and in the CT era.

DISCUSSION

The incidence of brain abscess in the population with congenital heart disease varies from 5 to 18.7% according to previous reports (9), and high mortality

rates for cyanotic brain abscess have been reported in both the pre-CT and CT eras (10,12,17,36). The introduction of CT and new antibiotics has dramatically

reduced mortality rates for total purulent brain abscesses from 40 to 60% (3,6,23,25)in the pre-CT era to the current rates of 0 to 10% (17,23,28,35,37). A

recent report on cyanotic brain abscess, however, states that the mortality rate is 13.3%, even in the CT era (20).

Our series of 62 patients with cyanotic brain abscesses in the CT era represents the largest series of such patients reported to date in a country where surgery

for cyanotic heart disease has been conducted aggressively. On the basis of the results of this series, there was no statistically significant correlation between

patients with good and poor (dead or totally disabled) outcomes determined by univariate analysis regarding clinical features and therapeutic modalities except

for age distribution, pretreatment neurological state, and IVROBA. Multivariate logistic regression analysis determined IVROBA to be a high risk factor for poor

outcome in patients with cyanotic brain abscesses.

We think these results may be largely attributable to the accuracy with which CT detected and localized cyanotic brain abscesses, coupled with prompt

aspiration of any and all abscesses larger than 2 cm in diameter, which causes significant mass e!ect, even in the late cerebritis stage. Furthermore, we have

aggressively treated brain abscess accompanied with IVROBA by aspiration, coupled with the administration of appropriate intravenous and intrathecal

antibiotics.


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Patients with cyanotic brain abscesses, which may develop in childhood and adolescence, are at high cardiopulmonary risk (9,20,27,32)and possess a wide

variety of coagulation defects and variable degree of immunodeficient states (21,22). For these patients, less invasive surgical procedures such as aspiration

should be chosen to reduce operative and anesthetic risks.

Etiology of cyanotic brain abscess

The etiology of cyanotic brain abscess presents several problems. Intracardiac right-to-left shunt bypass, by which blood is not filtered through pulmonary

circulation where bacteria are intercepted by phagocytosis, may allow direct entry to cerebral circulation (9,12,18). In these patients, the brain may also have

predisposing conditions such as minute low-perfusion areas because of severe hypoxemia and metabolic acidosis and increased blood viscosity resulting from

compensatory polycythemia (9,18), which, together with a consequent low-perfusion area, prepares a focus receptive to infection. Shunted blood containing

microorganisms may be seeded in such lesions, forming a cerebral abscess. This hypothesis implies that infarcts other than at the site of the abscess should

be observed or multiple metastatic brain abscesses should occur.

Fischbein et al. (9)and we, in a previous report (27), retrospectively evaluated risk factors for cyanotic brain abscess in patients with this condition compared

with a control group with cyanotic heart disease without brain abscess. The mean arterial oxygen saturation at the ascending aorta was significantly lower than

in the patients in the control group. Accordingly, increasing the mean arterial oxygen saturation at the ascending aorta by the more e!ective palliative shunt

operation and prevention of cerebral emboli exaggerated by dehydration and mild infection in patients with this disease may reduce the risk of abscess

formation until radical operation for the heart anomaly (24).

Antibiotics

During the last 20 years, antibiotics and techniques for culturing anaerobic bacteria (1,7)have much improved. Sterile cultures were reported in 16 to 68% of

brain abscesses with congenital heart disease in previous reports (9,10,20,23,36)and our series (48.7%). To avoid IVROBA, which may strongly influence poor

outcome in patients with cyanotic brain abscess, [beta]-lactam antibiotics should be administered intravenously and immediately, although broad spectrum

antibiotic therapy and the use of antibiotics before surgical intervention may increase the percentage of sterile abscesses. Determining the appropriate

bactericidal antibiotics, with the spectrum narrowed, should depend on the sensitivity of the microbial organism, which is generally identified within 48 to 72

hours. In patients who did not undergo surgery and in whom the microorganism was not identified, antibiotic therapy was based on either results of blood

culture or the empirical selection of antibiotics. Antibiotics may be continued for a minimum of 6 weeks (16)and in immunocompromised patients often for 12

weeks or longer. Although complications from broad spectrum antibiotics included sepsis caused by fungal superinfection in one patient who had a depressed

immune response, there were no patients with pseudomembraneous colitis in our series.

Management of cyanotic brain abscess

In our series, the mortality rate of patients with cyanotic brain abscesses decreased significantly, to 12.9% in the CT era, but has remained consistently high in

recent years compared with purulent brain abscesses without cyanotic heart disease (17,23,28,35,37). CT is indispensable for evaluating the development of

lesions in patients for every form of therapy. For patients with abscesses smaller than 2 cm in diameter and who are in clinically stable condition, intravenous

[beta]-lactam antibiotics are recommended. Patients with abscesses, however, should undergo aspiration if 1 week of medical treatment fails to result in

clinical or radiographic improvement.

For patients with abscesses (single or multiple) larger than 2 cm in diameter or who are in a deteriorated condition, a combination of aspiration and

intravenously administered appropriate antibiotics are recommended. Particularly, abscesses located in deep and parieto-occipital regions should be aspirated

immediately and repeatedly, mainly using CT-guided methods, even in the late stage of cerebritis, in which abscesses grow rapidly with maximal edema, to

decrease intracranial pressure and avoid IVROBA. The mortality rate observed in patients with cyanotic brain abscesses without IVROBA, all of whom were

treated in the CT era, was 7.3%. This mortality rate is similar to the rates reported for solitary or multiple bacterial abscesses of other origins (8,14,17,34,35).There has been little disagreement with our recommendation that cyanotic brain abscesses without IVROBA be managed in the same way as other purulent

abscesses (15,16,19,24).

Management of IVROBA

Cyanotic brain abscesses are frequently multiple and also occur at the junction of white and gray matter. Capsule formation is more complete on the cortical

side than the ventricular side (30), and abscesses have a propensity to rupture medially into the ventricles rather than laterally into the subarachnoid space (29),

with mass e!ect in the early capsular stage (4). Delay of surgical intervention is often quoted as a contributing factor for IVROBA (5). IVROBA, which is not

universally fatal but does worsen the prognosis, is often clinically demonstrated by catastrophic deterioration in the clinical status of patients with coma.

Zeidman et al. (38)collected the literature from 1950 to 1993, both for series of reported brain abscesses and for case reports with IVROBA. They claimed that

the mortality rate associated with IVROBA remained constantly high, approximately 80%, throughout this entire period. Prusty (20)reported 60 cases of

cyanotic brain abscess in the CT era (mortality rate, 13.3%), but only one patient had IVROBA, which resulted in death.

In our series, IVROBA occurred in 21 of 62 patients (33.9%), even in the CT era, and resulted in five deaths and one poor outcome (mortality rate, 23.8%). Our

findings suggest that IVROBA is a high-risk factor for poor outcome in patients with cyanotic brain abscesses in multivariate logistic analysis. Deep-located

abscesses also more frequently ruptured intraventricularly, and the abscesses located in the parieto-occipital region ruptured into the occipital horn of the

lateral ventricle in a short period.

The prevention and management of IVROBA, which is confirmed by contrast-enhanced CT or magnetic resonance imaging, may play a key role in decreasing

the incidence of poor outcome. Although previous reports concerning IVROBA of other purulent abscesses have recommended a combination of intrathecal

and intravenous antibiotic treatment, management of abscesses remains controversial. Yang and Zhao (37)request emergent craniotomy with rapid evacuation

of abscess material after IVROBA. Other reports (2,11)recommend emergent evacuation with lavage of the ventricles and ventriculostomy for intraventricular

antibiotic administration.

To reduce operative and anesthetic risks in patients with cyanotic heart disease, the first choice should be medical treatment for brain abscesses with IVROBA,

evaluating the abscesses and intracranial pressure pathophysiology by performing weekly CT. Secondary management of abscesses larger than 2 cm in

diameter and accompanied with dilated ventricles by aspiration of the abscess and ventricular drainage coupled with administration of appropriate intravenous

and intrathecal antibiotics is recommended.

CONCLUSION


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Because IVROBA is strongly correlated with poor outcome in patients with cyanotic brain abscesses, the key to decreasing mortality may be prevention and

management of IVROBA. Using mainly CT-guided methods, we repeatedly aspirated abscesses larger than 2 cm in diameter, even in late cerebritis, because of

decreasing intracranial pressure and avoided IVROBA. After IVROBA, we used aggressive aspiration coupled with administration of appropriate intravenous

and intrathecal antibiotics, evaluating intracranial pressure pathophysiology by performing weekly CT. We hope that the mortality rate associated with cyanotic

brain abscess will decrease in the near future, as with other purulent brain abscesses, through the adoption of sophisticated modes of therapy.

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COMMENTS

The authors evaluated a large series of patients with brain abscesses related to congenital cyanotic heart disease. Their finding of an increased rate of poor

outcome associated with intraventricular abscess rupture is important and should emphasize the necessity for early diagnosis and treatment of brain

abscesses. Interestingly, the authors recommend only general antibiotic care for patients with abscesses smaller than 2 cm in diameter as revealed by imaging.

I think that a specific bacteriological diagnosis would be facilitated by specific antibiotic therapy and that this would translate into a better results. Thus, we

recommend a stereotactic biopsy or aspiration of all patients with suspected brain abscesses, regardless of size (1). Although full spectrum coverage could be

obtained using multiple antibiotic agents, some drugs are associated with specific morbidities that might be avoided in this fragile patient group. Additionally,

because intraventricular rupture was associated with a poor result, our goal would be to identify the abscess early, diagnose and treat it specifically, and do our

best to prevent abscess enlargement and ventricular rupture.

This is clearly a heterogeneous population of patients with di!erent congenital disorders, di!erent types of brain abscesses, di!erent treatment regimens, and

distinct outcomes. It is di"cult to synthesize a management formula because of this, but the authors have performed a service by evaluating this large series.

Douglas Kondziolka

Pittsburgh, Pennsylvania

1. Kondziolka D, Duma C, Lunsford LD: Factors that enhance the likelihood of successful stereotactic treatment of brain abscesses.Acta Neurochir (Wien)

127:85-90, 1994. Bibliographic Links [Context Link]

Takeshita et al. provide a comprehensive review of their large series of 62 patients with brain abscesses associated with cyanotic heart disease managed in the

computed tomography (CT) era. Their treatment philosophy consists of immediate parenteral antibiotic administration with broad spectrum coverage and

surgical aspiration of abscesses larger than 2 cm in diameter causing significant mass e!ect. For abscesses with intraventricular rupture, parenteral and

intrathecal antibiotic administration was undertaken along with ventricular drainage and aspiration of abscesses larger than 2 cm in diameter, whereas

abscesses smaller than 2 cm in diameter were treated using cerebrospinal fluid drainage and the administration of intrathecal and intravenous antibiotics.


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Of the 62 patients, 22 patients (35.5%) had multiple abscesses and 21 patients (33.9%) had intraventricular rupture of the abscesses. Poor outcome(totally

disabled or death) occurred in nine patients (14.5%). Multivariate analysis determined that a poor neurologic status, older age, and presence of intraventr icular

rupture were the only factors significantly associated with poor outcome. No s ignificant association was determined between abscess size, multiplicity,

location, abscess stage, type of organism, or treatment(excision versus aspiration versus conservative) and outcome. The patients treated conservatively had

small abscesses, usually without significant mass e!ect, thereby making any outcome comparison with the surgically treated patients invalid. Patients with

multiple abscesses were more frequently immunocompromised with a higher risk of intraventricular rupture when compared with patients with solitary

abscesses. The risk of intraventricular rupture was also higher in abscesses in deeper locations compared to those in more superficial locations, and,

interestingly, of the abscesses located in the periventricular region, those located near the occipital horn were more prone to intraventricular rupture compared

to the abscesses located near the frontal horn. The authors appropriately emphasize the importance of aggressive surgical treatment of abscesses more prone

to intraventricular rupture, namely those larger than 2 cm in diameter with deep locations, especially near the occipital horns, to prevent this morbidcomplication.

Interestingly, despite the authors' aggressive surgical approach, a remarkably high number of the patients had intraventricular rupture, which is contradictory to

previous reports, even of patients with cyanotic heart disease. Nevertheless, the surgical morbidity was low (6.5%) and the outcome remarkably good. This

essentially reflects the e!ectiveness of the authors' treatment paradigm, especially in the setting of complex patients with associated cyanotic heart disease

with an increased risk of cardiopulmonary compromise, coagulation defects, and an immunocompromised state.

Our treatment philosophy also favors an aggressive surgical stance with stereotactic aspiration of all brain abscesses larger than 2 to 2.5 cm in diameter and

repeated aspirations if the size of a smaller abscess increases to greater than this size limit despite antibiotic treatment and/or previous aspiration. Patients

with associated intraventricular rupture of the abscesses also undergo ventricular drainage with intraventricular and parenteral antibiotic administration.

Cerebrospinal fluid drainage is not performed, even for smaller abscesses, mainly because of the risk of herniation. Although broad spectrum antibiotic

coverage is usually indicated in these patients, especially with a poor rate of organism isolation, we restrict the urge to initiate empiric antibiotic treatment

especially in surgical candidates until immediately after the aspiration to minimize the chance of a "sterile" abscess.

The authors present a good analytical report. I hope that with the insights provided herein, low morbidity will become a universal s tandard in the management

of this complex disease.

Rohit K. Khanna

Mark L. Rosenblum

Detroit, Michigan

The authors provide us with a follow-up report of 62 patients with cyanotic heart disease and brain abscesses. Their original report was published in 1983 and

addressed this situation essentially in the pre-CT era. This is certainly an extraordinarily large experience with this problem and serves as an excellent point of

reference for anyone dealing with patients presenting with brain abscesses and a history of cyanotic heart disease.

It is of interest that one-third of these patients had intraventricular rupture of their brain abscesses, and this was, as expected, associated with worse outcome.

I agree with the author's recommendation of aggressive drainage of an abscess that is in a location threatening to rupture into the ventricle.

William F. Chandler

Ann Arbor, Michigan

Takeshita et al. describe their continuing experience with the management of brain abscesses in patients with congenital cyanotic heart disease. They

retrospectively studied 103 patients treated at their facility from 1968 through 1995. The authors conclude that the mortality rate declined significantly after the

advent of CT, although intraventricular rupture of the brain abscess remained a catastrophic event. The authors clearly have a large experience with this clinical

entity. Because this series used a variety of individualized treatment approaches, the authors are precluded from making statistically definitive statements

regarding optimal surgical therapy in this setting. Nevertheless, their perspectives are of value to the generally neurosurgical readership.

It may be argued that the improvement in survival observed in the CT era may be a result of improvements in broad spectrum antibiotics, rather than

attributable to advances in imaging or in neurosurgical technique. With respect to technique, the authors' use of lumbar drainage for treatment of

intraventricular rupture of abscesses is well described, although it remains controversial in the literature. It is a pleasure to read a broad clinical experience,

carefully considered, that endeavors to discern how best to practice the art of neurosurgery in this challenging clinical setting.

Robert J. Maciunas

Nashville, Tennessee

Key words: Brain abscess; Cyanotic heart disease; Infection; Mortality

IMAGE GALLERY


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