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Arquivos de Neuro-Psiquiatria

Print version ISSN 0004-282X

Arq. Neuro-Psiquiatr. vol.72 no.7 São Paulo July 2014

http://dx.doi.org/10.1590/0004-282X20140070 

Articles

Endoscopic third ventriculostomy has no higher costs than ventriculoperitoneal shunt

Terceiro ventriculostomia endoscópica não apresenta custos mais elevados do que a derivação ventrículo peritoneal

Benicio Oton de Lima 1  

Riccardo Pratesi 2  

1Hospital de Base do Distrito Federal, Unidade de Neurocirurgia, Brasilia DF, Brazil;

2Departamento de Pediatria, Universidade de Brasília, Brasilia DF, Brazil.

ABSTRACT

Objective:

To evaluate the cost of endoscopic third ventriculostomy (ETV) compared to ventriculoperitoneal shunt (VPS) in the treatment of hydrocephalus in children.

Method:

We studied 103 children with hydrocephalus, 52 of which were treated with ETV and 51 with VPS in a prospective cohort. Treatment costs were compared within the first year after surgery, including subsequent surgery or hospitalization.

Results:

Twenty (38.4%) of the 52 children treated with VPS needed another procedure due to shunt failure, compared to 11 (21.5%) of 51 children in the ETV group. The average costs per patient in the group treated with ETV was USD$ 2,177,66±517.73 compared to USD$ 2,890.68±2,835.02 for the VPS group.

Conclusions:

In this series there was no significant difference in costs between the ETV and VPS groups.

Key words: hydrocephalus; ventriculoperitoneal shunt; neuroendoscopy; cost analysis

RESUMO

Objetivo:

Avaliar os custos da terceiro ventriculostomia endoscópica (TVE) comparada à derivação ventrículo peritoneal (DVP) no tratamento da hidrocefalia em crianças.

Método:

Foram estudadas 103 crianças com hidrocefalia, 52 das quais tratadas com TVE e 51 com DVP numa coorte prospectiva. Foram comparados os custos do tratamento no primeiro ano após a cirurgia, incluindo cirurgias ou internações subsequentes.

Resultados:

Vinte (38,4%) das 52 crianças tratadas com DVP necessitaram de outro procedimento por disfunção da válvula, em comparação a 11 (21,5%) das 51 crianças do grupo tratado com TVE. Os custos médios por paciente no grupo tratado com TVE foram de USD$ 2,177.66±517.73 comparados a USD$ 2.890,68±2.835,02 para o grupo DVP.

Conclusões:

Nesta série não houve diferença significativa de custos entre o grupo TVE e DVP.

Palavras-Chave: hidrocefalia; derivação ventriculoperitoneal; neuroendoscopia; análise de custos

Endoscopic third ventriculostomy (ETV) and ventriculoperitoneal shunt (VPS) insertion are the most used forms of treatment of obstructive hydrocephalus in children and adults1,2,3. Although there are many papers addressing the choice of the method of treatment of hydrocephalus4,5, there is no consensus6,7,8,9. The risk of ETV failure usually becomes gradually lower compared with the risk of VPS failure with increasing time from the surgery. Almost half of the shunt procedures performed in a hospital are shunt revisions10. The effectiveness of ETV shows a success rate extremely variable, from 30-90%11,12. If there is no significant difference in the outcome between the two techniques of treatment of hydrocephalus, the cost becomes an important concern, because no society has unlimited resources, and this is particularly important in the developing world13. The objective of our study was to compare the costs and outcome of treatment of obstructive hydrocephalus with ETV compared to VPS during the first year after surgery in a Brazilian Public Hospital.

METHOD

Study Design

A prospective cohort study of children who underwent initial hydrocephalus surgical treatment at the Hospital de Base do Distrito Federal (HBDF) during the years 2007 and 2008 was conducted. The children were observed during one year after the surgery. The study was approved by the Committee of Ethics and Research of the Secretary of Health of the Federal District (no. 026/07).

Patient population

During the time of the study, 162 children were admitted for the treatment of hydrocephalus. There were different etiologies of hydrocephalus, and the choice of treatment (ETV or VPS) was at the discretion of the neurosurgeon on call. Children with severe neurological malformations such as hydranencephaly were not included. In cases with specific etiologies of hydrocephalus, such as that associated with myelomeningocele, post-infectious and post hemorrhagic, the indication of treatment was almost always VPS. These cases were also excluded from the study.

The cohort studied consisted of 103 children, 52 treated with VPS and 51 treated with ETV. Information recorded included age, sex, etiology of hydrocephalus, imaging, surgery (ETV or VPS) and operative complications, length of hospital stay after the surgery, late complications, hospitalizations for failures of VPS or ETV up to one year after the first surgery, total number of in-patient hospital days due to failure, number of new surgeries needed for correction of the initial failure, follow up during one year after the first surgery, head circumference at surgery and after one year, improvement in neurological status after one year, and total costs paid by the Brazilian Government. Cases of early failure of the procedure were counted as a new admission even when occurred during the first week after surgery.

The ETV was conducted using a rigid endoscope14 inserted in the lateral ventricle (usually from the right) free hand. The floor of the third ventricle was perforated using a 4 French balloon catheter, midway between the mammillary bodies and the infundibular recess in the midline, and was considered successful if the Liliequist membrane was opened, and the surgeon could see the basilar tip or its branches. The VPS were performed with the use of a fixed pressure valve available at the moment of the surgery (Ventura Biomédica, Sao José do Rio Preto, Brazil, or Phoenix Biomedical, PA, USA).

The number of hospital days was counted after the first surgery for hydrocephalus. The failure of the procedure (ETV or VPS) was defined by any subsequent surgery for cerebrospinal fluid (CSF) diversion15 or death related do hydrocephalus. The head circumference was considered by percentile, according to the child’s age. The neurological status was evaluated using the Denver Scale adapted for children up to 7 years of age. For those older than 7 years the Health Utilities Index16 was used. The children were examined prior to surgery and at one-year follow up and the exams compared.

The costs of the treatment of the children with hydrocephalus in our series were calculated taking into account the values reimbursed by the Brazilian government. The Brazilian Health Care System pays for the health care for all Brazilian citizens. Most of the people who seek treatment in Public Hospitals in Brasilia are low-income, and do not have a private health insurance. The Unified Health System of the Brazilian Government pays a total amount of $ 1,760.89 (all monetary units are given in US dollars for the year 2008) for each patient treated with ETV. In this amount is included all the hospitalization expenses for a period of up to 6 days. The payment is made by the procedure per patient, so that hospitals try to optimize their costs, reducing hospitalization time, and trying to avoid complications. For those treated with VPS, the amount of $ 833.73 is paid for the surgery and hospital costs, and an extra $ 469.88 is paid for the shunt valve and catheters. In this study, the costs were calculated for each patient according to the procedure, imaging tests, hospital stay, and complications. If the child needed a new surgery for treatment of VPS or ETV failure, the costs of this treatment were added.

Data were analyzed using SPSS Advanced Statistics 20.0 (SPSS Inc., Chicago, IL, USA).

RESULTS

The group was composed of 77 (47.5%) girls and 85 (52.5%) boys. There were different etiologies of hydrocephalus (Table 1). The cohort study group was composed of 103 hydrocephalic children with a mean age of 24.6±25.2 months, 52 of them treated with VPS (mean age 17.6±18.3 months) and 51 treated with ETV (mean age 32.4±29.5 months). The mean postoperative hospital stay was 2.1±0.8 days, ranging from 1-4 days, and was similar for both groups (ETV 2.24±0.6 days and VPS 2.06±0.8 days).

Table 1 . Etiologies of hydrocephalus and surgery. 

Etiology VPS ETV Total
Neurocysticercosis 0 1 1
Post traumatic 3 2 5
Post infectious 8 1 9
Dandy Walker Malformation 8 1 9
Posterior fossa tumor 4 6 10
Post hemorrhagic 16 0 16
Myelomeningocele 23 1 24
Congenital obstructive 45 43 88
Total 107 55 162

From the 52 treated with VPS, 20 (38%) showed failure, and it was necessary to perform 61 new operations, ranging from 1 to 10 new surgeries per child. From the 51 treated with ETV, 11 (21.5%) showed failure, and were reoperated 10 times. One child with cerebrospinal fluid (CSF) leak was managed conservatively. The causes of failure of the first surgical treatment for hydrocephalus are listed on Table 2.

Table 2 . Causes of failure of treatment. 

VPS ETV
CSF fistula 1 1
Infection 7 0
Obstruction 12 10

Some complications did not need surgical correction, such as positional deformities in the skull due to CSF over drainage in nine children treated with VPS, none was observed in those treated with ETV. In two children in the VPS group was noted temporary accumulation of CSF in the valve path, but as there was good control of the hydrocephalus, they were treated conservatively. In the ETV group, one child had transient hemiparesis and another had acute hydrocephalus almost 10 months after the procedure and died. The average head circumference of the children in the VPS group was in the percentile 93.8±15.7 and in the ETV group was 91.1±12.4. The head circumference one year after the first surgery was in the 50.7±41.2 percentile in the VPS group and 76.9±17.6 percentile in the ETV group. No difference in neurological status improvement was noted between the VPS and ETV group.

The survival rate of the CSF diversion at one year, shown in Figure, was 78.4±5.8% for ETV and 61.5±6.7% for VPS. Despite the trend toward greater survival time of ETV compared to VPS, there is no statistical significance by the Log Rank and Breslow tests of equality of survival distributions.

Figure . Kaplan Meier curve for ETV or VPS. ETV survival curve is shown in dotted line and VPS survival curve in continuous line. VPS: ventricle peritoneal shunt; ETV: endoscopic third ventriculostomy.  

The average costs paid for the treatment of hydrocephalus during the period of study was $ 2,537.60±2,068.43 ranging from $ 1,357.75 to $ 12,923.15. The average cost for treatment of hydrocephalus with VPS was $ 2,890.69±2,835.02 and for those treated with ETV was $ 2,177.60±517.73. There is no statistically significant difference between the two groups, but in the present series there is a trend to lower costs in the ETV group.

DISCUSSION

Pediatric hydrocephalus places a substantial burden on patients and the health care system. Since the introduction of ETV in the 1990s, this technique has rapidly gained new enthusiasts and was indicated as the procedure of choice in the treatment of obstructive hydrocephalus17,18,19, avoiding the fear of VPS malfunction and need for further surgery. Probably a child with a shunt malfunction generates more emergency visits, creates more anxiety in parents and physicians, and consumes more resources than all other pediatric neurosurgery problems20,21. The choice between VPS and ETV should take into account the clinical outcomes and the expenditures for each surgical procedure22.

As described before in previous studies8, we did not observe difference in outcome in children with hydrocephalus treated with ETV or VPS. There was no difference in postoperative hospital stay between the two groups, and both procedures were well tolerated by children. The number of reoperations was higher in the VPS group, and two children have been submitted to 10 new surgical procedures. Considering the emotional burden for the child and for parents for every surgery, it is thought that the emotional suffering is greater in this group than with ETV, which required a smaller number of reoperations23,24,25,26. In our study CSF infection was observed only in the VPS group. Whereas ventriculitis may impair cognitive function of children26, this is a factor that must be taken into consideration when choosing between ETV and VPS in the initial treatment of obstructive hydrocephalus. The VPS led to a faster control of large head circumference, but otherwise caused an increased frequency of positional deformities in the skull. This data needs to be further studied by comparing groups of infants treated with ETV and VPS. Since there is a tendency to treat older children with ETV, it is possible that this issue will be not adequately answered. A complication found only in the group treated with ETV was transient neurological deficit and late death. This is a rare complication and there is report of only few cases in the world27. We observed a continuous decrease in the Kaplan-Meier survival curve for the patients treated with VPS in the first year of follow up. In the ETV group there was a rapid decrease after the procedure followed by a more constant curve.

This is the first Brazilian study of the economic costs associated with hydrocephalus. Comparing the costs of ETV with VPS in a public hospital, we noted a tendency to higher costs in the VPS group with passing of time, although this difference was not statistically significant, as have been related before22. When dealing with costs for chronic childhood illness like hydrocephalus, it should be noted that there are transportation costs, access to services, and usually there is a decrease in the family income23. The stress and worry caused by short monetary resources may have effects on the well being of the whole family25.

The initial costs of the treatment of hydrocephalus paid by public money were higher in the ETV group than in the VPS group. However, when comparing costs with one year follow up, the final costs are reversed, with more costly treatment with VPS than with ETV. It should be noted that this series shows a tendency, but the numbers are not statistically significant.

In this series, the choice of the surgical technique for the treatment of obstructive hydrocephalus could not be determined by the clinical results, since these results were similar. Thus the financial aspect becomes important and there was a tendency after one year of the surgery to lower expenses when the hydrocephalus was treated with ETV, although without statistical significance. This trend suggests that Public Resources should continue to be used in the endoscopic treatment of hydrocephalus.

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Received: August 29, 2013; Revised: April 09, 2014; Accepted: April 29, 2014

Correspondence: Benicio Oton-de Lima; SMHS, Area Especial, Q 101; 70330-150 Brasília DF, Brasil; E-mail: otondelima@gmail.com

Conflict of interest: There is no conflict of interest to declare.

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