Cerebrospinal fluid drainage options for posthemorrhagic hydrocephalus in premature neonates

Opções de drenagem liquórica em neonatos prematuros com hidrocefalia pós hemorrágica

ABSTRACT

Objective

The literature describes various cerebrospinal fluid (CSF) drainage techniques to alleviate posthemorrhagic hydrocephalus in preterm newborns; however, consensus has not been reached. The scope of this study was describing a case series of premature neonates with posthemorrhagic hydrocephalus and assessing the outcomes of different approaches used for CSF diversion.

Methods

A consecutive review of the medical records of neonates with posthemorrhagic hydrocephalus treated with CSF drainage was conducted.

Results

Forty premature neonates were included. Serial lumbar puncture, ventriculosubgaleal shunt, and ventriculoperitoneal shunt were the treatments of choice in 25%, 37.5% and 37.5% of the cases, respectively.

Conclusion

Cerebrospinal fluid diversion should be tailored to each case with preference given to temporary CSF drainage in neonates with lower age and lower birth-weight, while the permanent ventriculoperitoneal shunt should be considered in healthier, higher birth-weight neonates born closer to term.

cerebral hemorrhage; hydrocephalus; cerebrospinal fluid

RESUMO

Objetivo

A literatura descreve várias opções de drenagem liquórica (DL) para alivio da hidrocefalia pós-hemorrágica (HPH) em neonatos prematuros; contudo, não existe um consenso sobre a melhor abordagem. O escopo deste estudo foi descrever uma série de casos de neonatos prematuros, portadores de HPH, verificando os resultados de diferentes técnicas utilizadas para DL.

Métodos

Revisão consecutiva dos prontuários de neonatos com diagnostico de HPH submetidos a DL.

Resultados

Quarenta recém-nascidos prematuros foram incluídos. A punção lombar seriada (PL), a derivação ventriculosubgaleal (VSG) e a derivação ventrículo peritoneal (VP) foram o tratamento escolhido em 25%, 37,5% e 37,5% dos casos, respectivamente.

Conclusão

As opções de DL devem ser avaliadas caso a caso, sendo dada preferência às drenagens temporária em prematuros com idade e peso mais baixos ao nascer, enquanto o shunt definitivo (derivação VP) pode ser considerado naqueles prematuros mais saudáveis, com idade e peso superiores.

hemorragia cerebral; hidrocefalia; líquido cefalorraquidiano

Intraventricular hemorrhage (IVH) has been a major cause of mortality among premature neonates for more than 40 years¹,² and is associated with neonatal encephalopathy, subsequent subtle apnea, and death¹,²,³,⁴. Low birth-weight premature neonates are more vulnerable to IVH and, depending on the IVH grade, to posthemorrhagic hydrocephalus (PHH). Posthemorrhagic hydrocephalus can evolve to progressive PHH, and in more severe cases, to periventricular hemorrhagic infarct, hemorrhagic cerebral injury, and periventricular leukomalacia¹,⁴,⁵. Between 15% to 20% of neonates born with a weight less than 1,500 g are estimated to develop IVH. Further, 75% of those with Papile grade III or IV hemorrhages develop progressive PHH and need a permanent shunt ⁴,⁶.

The literature does not clearly indicate any standardized protocols for the best PHH treatment options in this patient group. Rather, a variety of approaches, ranging from serial lumbar punctures (LP), transcutaneous transfontanellar puncture, external ventricular drainage, and ventriculosubgaleal shunt (with or without subcutaneous reservoir) to the endoscopic third ventriculostomy are used⁴,⁶,⁷,⁸,⁹,¹⁰,¹¹,¹²,¹³ Ventriculoperitoneal (VP) shunts are contraindicated as a first option in low birth-weight (< 1.500g) premature neonates due to the higher risk of complications associated with the implanted prosthesis and are reserved for selected cases⁴,⁹,¹¹,¹³. The scope of this study was describing a case series of premature neonates with PHH and assessing the outcomes of different approaches used for CSF diversion.

METHODS

Study design and inclusion criteria

This single-center study was approved by the Brazilian Research Ethics Committee (registration number 38819114.7.0000.5557). This retrospective review and observational study included all premature neonates admitted with a diagnosis of PHH to the neonatal intensive care unit at a Reference Public Pediatric Hospital in Salvador da Bahia, Brazil between December 2009 and December 2014. The diagnosis of PHH identified by a transcranial ultrasonography, and treated with a CSF drainage procedure, and a minimum follow-up of three months for the assessment of treatment outcomes.

Definitions of prematurity, IVH and PHH

Premature neonates were defined as those born before 37 weeks of gestation and as low birth weight when weight-at-birth was less than 1.500g⁴. In all patients, transcranial ultrasonography was performed by a senior radiologist with more than ten years of experience using a classical transfontanellar approach with a 1.9–6-MHz curvilinear transducer (Toshiba Aplio™ 100 with color Doppler).

The Papile system was used for grading IVH by transcranial ultrasonography. Briefly, grade I was defined as hemorrhage restricted to the ventricular subependymal matrix occupying a maximum of 10% of the ventricles. Grade II and III were defined as hemorrhage comprising 10–50% and more than 50% of the ventricular system, respectively. If the hemorrhage extended to the periventricular, i.e., parenchymal, regions, it was considered as a grade IV IVH¹⁴.

A diagnosis of PHH secondary to IVH was made when the anterior horns width of the lateral ventricles was ≥ 6 mm as measured in the anterior coronal plane at the level of the septum pellucidum (median line), with the midpoint in the lateral wall of the lateral ventricle (at the level of caudate nucleus and the foramen of Monro) (Figure)⁴,¹⁵,¹⁶. Comorbidities considered as severe were global hypotonia associated to bradycardia, cardiorespiratory arrest, respiratory failure, cutaneous cyanosis, sepsis and other infections associated with clinical and laboratory worsening.

Figure
Transcranial ultrasonography: the width of the anterior horns of the lateral ventricles was measured in the anterior coronal plane at the level of the septum pellucidum (median line), with the midpoint in the lateral wall of the lateral ventricle (at the level of caudate nucleus and the foramen of Monro).

Surgical intervention

Conditions that were included that required a neurosurgical evaluation were bulging fontanelles, an increase in the cranial circumference, bradycardia, and other signs of intracranial hypertension, associated with transcranial ultrasonography showing ventriculomegaly (anterior horns width showing progressive increase) and IVH grades III and IV.

The CSF drainage is commonly indicated in cases of progressive increases in cranial circumference (≥ 2 standard deviations above the patient’s age group during the first week), bulging fontanelles, or changes in respiratory patterns, associated with progressive widening of the ventricular system detected by transcranial ultrasonography¹³,¹⁷,¹⁸. In cases of ventriculomegaly from ex vacuo hydrocephalus (i.e. without bulging fontanelles, increase in the cranial circumference, bradycardia, or other signs of intracranial hypertension), a nonsurgical treatment was proposed.

The study did not assess the preferred CSF drainage method among transcutaneous transfontanellar puncture, external ventricular drainage, or ventriculostomy, as our pediatric neurosurgical team prefers not use them, in cases of neonates with PHH. As described in previous studies⁸,¹⁰,¹³,¹⁷,¹⁹,²⁰,²¹,²²,²³, the following techniques were employed for CSF drainage to resolve PHH: Serial LP was performed at the L3-L4 or L4-L5 level, with the anatomical landmark as an imaginary line traced from the iliac crest to the lumbar column. A valveless ventriculosubgaleal shunt with subcutaneous reservoirs was placed with an incision near the external angle of the anterior fontanelle, followed by the detachment of subgaleal space and the introduction of a 3-cm catheter into the anterior ventricular horn; the catheter was then connected to the reservoir and the scalp. The VP shunt was placed as follows: an incision was made near the lambdoid suture, and a mini-laparotomy was performed for tunneling of the distal catheter of the VP shunt. A burr-hole was made for the osseous and dural exposition, the dura was opened, and a 5-cm catheter was introduced into the posterior ventricular horn. The proximal and distal catheters were connected and fixed in the periosteum, and the distal catheter was introduced into the peritoneal cavity under direct vision. Finally, the musculoaponeurotic, subcutaneous, and cutaneous layers were closed. In this study, the serial LPs and ventriculosubgaleal shunts were considered to be temporary CSF drainage options, while the VP shunt was considered as the only permanent CSF drainage approach.

Follow-up and complications

Patients were evaluated for the persistence or enlargement of hydrocephalus, CSF leak, shunt infection, failure, or mechanical dysfunctions for at least three months after CSF diversion. Hydrocephalus was assessed by the enlargement of cranial circumference or bulging fontanelles during follow-up and transcranial ultrasonography showing anterior horns width ≥ 6 mm measured in the anterior coronal plane.

Statistical analysis

Epi Info^TM version 7, a public domain statistical software for epidemiology developed by the US Centers for Disease Control and Prevention, was used for database analysis. Some results were presented as descriptive statistics. Measures of central tendency (mean, mode, and median) were calculated and presented where relevant. The chi-squared test was used to compare ratios with a confidence interval of 95%. The differences were considered statistically significant if the p-value was < 0.05.

RESULTS

Forty-nine preterm neonates with PHH were treated by CSF drainage during the study period; however, nine patients were excluded because they were lost to follow-up. Thus, 40 preterm neonates were included in the final analysis. The median gestational age and birth weight were 28 weeks (range; 24–35 weeks) and 1,105 g (range; 600–2,800 g), respectively. Patient characteristics are shown in Table 1.

Table 1
General characteristics of preterm neonates treated for CSF diversion due to PHH (Salvador, Brazil, 2009–2014).

General characteristics	n = 40
Male sex, n (%)	22 (55)
Median gestational age in weeks	28 (24–35)
Median weight at birth in g	1,105 (600–2,800)
IVH grade, n (%)
Papile grade III	28 (70)
Papile grade IV	12 (30)
Complications after birth*, n (%)	35 (88)

• CSF: cerebrospinal fluid; IVH: Intraventricular hemorrhage; PHH: posthemorrhagic hydrocephalus. *hypotonia, bradycardia, cardiac arrest, respiratory failure, skin cyanosis, sepsis and other infections.

Twenty-five patients (62.5%) were treated with temporary CSF drainage approaches: 10 patients (25%) with serial LP, and 15 cases (37.5%) with a ventriculosubgaleal shunt as the first option to alleviate PHH. Ventriculoperitoneal shunts were used in 15 neonates (37.5%) to treat PHH as the first option, generally with low-pressure valves.

The median age and weight of patients treated with temporary drainage methods were 27 weeks (range; 24–35 weeks) and 867 g (range; 600–1730g), respectively, while the median age and weight of patients treated with VP shunts were 32 weeks (range; 26–35 weeks) and 2000 g (range; 1500–2800g), respectively (Table 2). All of the patients treated with temporary CSF drainage methods were considered clinically more severely affected, had previous infections, or suffered from severe comorbidities. In contrast, significantly fewer patients treated with the VP shunt had severe comorbidities (66%; p = 0.004) (Table 2), and none in the latter group had comorbidities related to sepsis or other infections.

Table 2
Characteristics of preterm neonates according to the initial PHH treatment approaches (Salvador, Brazil, 2009–2014).

Criteria	Temporary CSF Diversions*	Permanent CSF Diversions**	p
	n = 25 (%)	n = 15 (%)
Median
Age in weeks	27 (24–35)	32 (26–35)	-
Weight in g	867 (600–1730)	2000 (1500–2800)
Severe comorbidities***, n (%)	25 (100)	10 (66)	0.004
IVH Grade, n (%)
Papile grade III	14 (56)	14 (93)	0.01
Papile grade IV	11 (44)	01 (6)

• CSF: cerebrospinal fluid; IVH: intraventricular hemorrhage; PHH: posthemorrhagic hydrocephalus. *Serial LP and ventriculosubgaleal shunt; **definitive CSF diversion method: VP shunt. ***Global hypotonia associated to bradycardia, cardiorespiratory arrest, respiratory failure, cutaneous cyanosis, sepsis and other infections associated with clinical and laboratory worsening.

Regarding the initial method chosen for PHH treatment, 50% (5/10) of those undergoing serial LP and 46% (7/15) of those undergoing ventriculosubgaleal shunt required VP shunts during the course of PHH evolution (12/25, 48%) (Table 3). During the follow-up period of all enrolled patients, 68% (27/40) were considered as permanent ventricular drainage dependents and were using VP shunts. The incidence of progressive PHH was higher in case of IVH grade III (79% vs 42%; p = 0.02).

Table 3
CSF drainage approaches and complications in preterm neonates with PHH (Salvador, Brazil, 2009–2014).

Variable	First option for therapeutic relief of hydrocephalus n = 40
	LP (n = 10)	VSG shunt (n = 15)	VP shunt (n = 15)
Retreatment due to persistence or enlargement of hydrocephalus*, n (%)	5 (50)	7 (46)	-
CSF leak, n (%)	-	4 (26)	-
Shunt malfunction or infection, n (%)	-	-	10 (66)

• CSF: cerebrospinal fluid; PHH: posthemorrhagic hydrocephalus; VSG: ventriculosubgaleal. ^*Enlargement of cranial circumference or bulging fontanelles during follow-up.

Among the 27 patients considered as permanent ventricular drainage dependents, 44% (12/27) had infectious complications or mechanical dysfunction (obstruction or overdrainage). Ten of these patients had received a VP shunt as the first option for PHH treatment (Table 3). This group that received a VP shunt as the first option for PHH treatment (n = 15) had a higher incidence of complications than those treated for progressive PHH with a VP shunt during the follow-up period (n = 12) (66% vs 16%, p = 0.01). There was a total of five deaths (5/40; 13%). The average and median time of follow-up was 11.8 months (DP +/- 16.2 months) and three months (range; 3–60 months).

DISCUSSION

Intraventricular hemorrhage is the leading cause of hydrocephalus in premature neonates, especially those with low birth-weight, and generally occurs within the first four days of life¹¹. Low gestational age and low birth-weight increase the risk for developing IVH⁴,⁶,¹¹,¹⁷, a finding consistent with the median age (28 weeks) and weight (1,105g) of the patients enrolled in this study. There is a minor male predominance reported in previous studies¹⁷.

Most of the patients included in the current study were diagnosed with Papile grade III IVH. This finding is in agreement with previously reported risk of PHH in this patient population⁶,¹³,²³. These patients are commonly referred to pediatric neurosurgery for either temporary or permanent CSF diversion to relieve PHH-induced intracranial hypertension⁶,¹³,¹⁷,²²,²³, while grade I and II patients are usually not referred for neurosurgical evaluation due to the lower incidence of PHH and intracranial hypertension. The high number of patients with clinical complications such as hypotonia, bradycardia, cardiac arrest, respiratory failure, skin cyanosis, sepsis, and other infections, highlight the susceptibility of these patients as well as the challenges in their management⁴,¹⁷, both of which are clinically considered in deciding the appropriate treatment options for CSF diversion in PHH cases²³.

The method chosen for CSF drainage in PHH cases does not follow a specific protocol, and varies with the neurosurgeon’s experience, the age and weight of the premature neonate, the presence of associated comorbidities, the characteristics of the ventricular system assessed by imaging studies, and the clinical presentation. In this study, none of the patients received an initial treatment with transcutaneous transfontanellar puncture, external ventricular drainage, or ventriculostomy. Transcutaneous transfontanellar puncture is not used as a first choice at our hospital due to the associated risks, which include CSF leak, porencephalic cysts, and multiloculated hydrocephalus⁴. External ventricular drainage is not used for temporary relief of hydrocephalus as a first option in premature neonates due to the risks associated with infection and accidental removal of the external ventricular drainage, which have been observed in other reference centers as well⁴,⁶,¹⁰,¹³,¹⁷,¹⁹,²²,²³. While still considered as a controversial method in neonates with IVH, several groups have recommended the irrigation of ventricles for the removal of blood clots, the coagulation of choroid plexus, and the opening of the third ventricle floor by ventricular endoscopy, with the aim of reducing progressive PHH rates or, at a minimum, of delaying the use of permanent shunts in select cases²⁰,²¹. At our hospital, we do not have experience in the use of ventriculostomy in premature neonates; rather, this technique is reserved for use in children over two years of age who are diagnosed with obstructive and noncommunicating hydrocephalus, or congenital cerebral cysts (arachnoid cysts).

In this study, we found a tendency to use temporary drainage methods in infants with lower gestational age and birth weight, while the VP shunt was reserved for older, heavier and healthier children, a finding that corroborates previously published data regarding CSF diversion options²³. The serial LP was chosen in low birth-weight premature neonates with more severe and clinically unstable comorbidities, as it is the fastest method that does not require general anesthesia or transportation to the operating room; the procedure can be performed in the neonatal intensive care unit. In cases of more stable clinical conditions, the ventriculosubgaleal shunt as an alternative temporary drainage approach is considered, especially in infants with grade III IVH. As seen in Table 2, in addition to age and weight, additional factors including associated morbidities and the IVH grade, aid the neurosurgeon in deciding between a temporary and a permanent CSF drainage.

Ventriculoperitoneal shunt was chosen as the first option for relief in 37.5% of patients, similar to that found in previous studies (34%)¹⁷. In several reference centers, the VP shunt is often chosen as a first-line treatment modality for IVH-associated PHH (range; 53–72%)¹³,²³. This divergence in published studies on the subject shows the lack of a standardized protocol across different institutions. Our findings corroborate earlier studies suggesting that the VP shunt should be chosen as the initial therapy in select cases, specifically in older preterm neonates who are heavier, healthier, and are without infections⁴,¹⁷,²³.

As previous studies⁶, among the temporary ventricular drainage options, we found that serial LP in up to 50% of the cases resolved PHH. The ventriculosubgaleal shunt achieved resolution in 54% of the cases, comparable to the serial LP. The advantages of the ventriculosubgaleal shunt over the serial LP include the likelihood and the ease of serial punctures in the reservoir if intracranial hypertension develops¹⁰,¹³,²³.

In this study, 48% of the patients were initially treated with temporary methods for PHH resolution and were subsequently treated by the VP shunt based on monitoring for the clinical signs of intracranial hypertension, such as bulging fontanelles and increased head circumference. The predictive factors that can aid in the replacement of a temporary ventricular drainage method with a permanent one are not yet established⁴,¹³,¹⁷. In general, depending on the study sample, the percentage of patients depending on a permanent shunt in the follow-up period ranges from 30% to 75% ⁴,⁶,¹⁵, in agreement with our findings that show 68% of our patients needing the permanent shunt.

Ventriculoperitoneal shunt complications in these patients are often higher than those observed in the general pediatric population. In certain series, more than 50% of VP shunt recipients need further VP shunt exchanges and revisions⁶,²³. Our data corroborate these earlier findings; the patients treated with a VP shunt for initial PHH management had higher complication rates than those treated with a VP shunt as a second option during the follow-up period. In a series of children with congenital hydrocephalus described previously by our team²⁴, we observed a much lower incidence of VP shunt-related complications than those observed in the current series, which confirms the need for extreme care in the selection of PHH patients for a VP shunt as a first CSF drainage option.

The overall mortality rates of IVH in preterm neonates may vary from 30% to 58%, and are higher in those with Papile grade IV IVH⁴,⁶,²⁵. The mortality rate in this study refers to only those patients undergoing neurosurgical evaluation. Moreover, nine patients were excluded from the final analysis due to the lack of the minimum stipulated follow-up period of three months. The mortality rate in our cohort (13%) is similar to the previously-published studies that included only the IVH patients with PHH undergoing neurosurgical treatment²³.

Only the CSF drainage methods used for PHH treatment at the hospital where the study was conducted were analyzed, and do not necessarily reflect the reality of other reference centers. Finally, we would also like to indicate that only those patients assessed by a pediatric neurosurgeon were included in this study, while those determined by the neonatologist not to qualify for neurosurgical evaluation were excluded.

In conclusion, temporary CSF diversion methods should be the first option for PHH treatment in premature neonates, especially in those small for gestational age and those with low birth-weight. A serial LP should be considered in more severe cases as general anesthesia, transportation, or excessive handling of the patients are not required. The ventriculosubgaleal shunt is another option, especially in those with more stable clinical conditions and controlled comorbidities. Only in the older, heavier, and healthier newborns, especially in those with Papile IVH grade III, should the VP shunt be considered as the first option for PHH treatment. As reflected in our findings, which showed complications in patients who were treated with the VP shunt as the first option, ventricular endoscopy should be considered and evaluated as an alternative option in PHH treatment to delay the implantation of a permanent shunt.

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Publication Dates

• Publication in this collection
  July 2017

History

• Received
  20 Jan 2016
• Reviewed
  05 Jan 2017
• Accepted
  14 Mar 2017