Endoscopic third ventriculostomy: a surgeon's experience.
The management of hydrocephalus varies depending on age, cause, recurrence rate and surgeon's decision. Ventriculoscopy was first introduced during the early twentieth century and Walter E. Dandy was one of the pioneers in its use for hydrocephalus management (2). It was in 1923 that an urologist, William Mixter, using a utheroscope examined and performed the first documented ETV (3). During the following decades third ventriculostomy through a small open craniotomy was the main treatment modality prior to the development of shunt systems during the 1950s. However, due to the high mortality and morbidity rates and the availability of less traumatic procedures, it was partially abandoned.
Nonetheless, as time elapsed and the limitations of shunt systems and its complications became evident, and with the advent of breakthrough fiberoptic and lens technology a renewed interest in ETV was undertaken (4). Nowadays, many patients with hydrocephalus may benefit with the use of ETV. Among the indications for ETV we include all of the following: obstructive triventricular hydrocephalus due to aqueductal stenosis, isolated lateral ventricular hydrocephalus, Dandy-Walker malformation, intraventricular hemorrhages, posterior fossa masses, pineal tumors and NPH (5-8).
Various controversies have arisen with the increase use of ETV for the management of hydrocephalus in the pediatric and adult population. Still definite indications or guidelines for the use of ETV have not been defined. In this article we retrospectively analyzed twenty-nine patients treated at UDH and UPH in San Juan, Puerto Rico.
Patients and Methods
A retrospective study including the time frame between September 2005 and May 2007 was conducted. Twenty nine (29) patients underwent ETV for the treatment of hydrocephalus at UPH and UDH in San Juan, Puerto Rico and all were treated by one neurosurgeon. Records were reviewed for age, gender, etiological factors, signs, symptoms, use of external ventricular device (EVD), and post-operative hospital stay. The indication for ETV was based on radiological findings and symptoms.
A free-hand procedure was performed in all patients with general anesthesia. Patients were positioned supine with the head slightly flexed (20[degrees]). A burr hole was typically placed immediately in front of the coronal suture and 3 cm or more, dependent on etiology, laterally to the midline. The lateral ventricle was cannulated, then a rigid endoscope was advanced and the ventricle was visualized; under direct vision, the endoscope
was passed thorough the ipsilateral foramen of monro into the third ventricle. Anatomical structures such as the choroid plexus, mamillary bodies, and the infundibular recess were identified prior to perforation of the floor of the third ventricle. Perforation of the floor was performed either bluntly with a 30[degrees] endoscope, or with a Fogarthy catheter Fr. 3 or 4. Upon perforation the prepontine cistern was entered, and the basilar artery complex and adjacent cranial nerve were visualized.
The mean age of the population was 36 years. Seventy-two percent (72%) were adults and twenty-eight percent (28%) were pediatric. Fifty-five percent (55%) were male and forty-five percent (45%) were female, table 1.
The commonest sign and symptoms in the adult population were: headache (52%), gait disturbance (43%), altered mental status (29%), vomits and nausea (24%). While in the pediatric population, the most common symptom was increased head circumference (38%), table 1.
The etiological factors for hydrocephalus were: aqueductal stenosis (59%), normal pressure hydrocephalus (17%), tumors (10%) and others (14%), table 1.
Procedure-related complications were 3 % and failure rate was 10%. The complication reported in our series was ventriculitis. Despite the complications, the patients did not fail the management and were treated with antibiotics.
In 15 patients (51.7%), an EVD was placed intra operatively and left for a mean time of 2 days to monitor intracranial pressure. EVD were always closely monitored; none of the patients develop increased intracranial pressure.
The average postoperative hospital stay was 7 days. Twenty-three percent (23%) of the patients had a shunt system prior to ETV. The average postoperative stay for patients with EVD was nine days compared to 4 days for those without EVD.
The management of hydrocephalus remains a complex scenario for the neurosurgeon. Endoscopic third ventriculostomy has been popularized due to the fact that, if successful, a shunt-free period is guaranteed and a life-long dependency on a ventriculo-peritoneal shunt (VPS) could be avoided. However, it must be clearly stated that ETV success does not guarantee a cure for hydrocephalus; it only benefits the patient in the sense that no shunt is better than a perfect shunt. ETV has been established as a reasonable alternative to VPS and ventriculoatrial shunts (VA) or as treatment for VPS/VA failure. The central dogma that "a shunt is always a shunt" has been disfranchised with the experience with ETV (9-10). The main issue related to ETV is whether if it is a safer and better treatment for patients with hydrocephalus as compared to VPS/VA. When comparing success, special mention should be given to complication rate, success rate and cost-benefit analysis.
Results demonstrate that the most common indication for ETV among our population was tri-ventricular hydrocephalus secondary to benign aqueductal stenosis. It has been shown in the literature that the treatment of choice for benign isolated aqueductal stenosis is ETV due to its good outcome (11-15). Aqueductal stenosis, due to its inherent nature, represented the ideal situation for the implementation of ETV. In the majority of cases, aqueductal stenosis was caused by a mechanical obstruction within the aqueductal lumen such as membranes or by an extrinsic compression such as a tumor in the tectal plate or the pineal gland (16). Thus, by forming a new CSF communication bypass between the third ventricle and the subarachnoid space normal flow can be restored.
The failure rate for ETV has been cited as between 0% and 36% (17-20). At 10% our failure rate was comparable to the literature. Among factors that have been advocated as possible failure scenarios are: age < 1 yr, pre-existing shunt infection, post-operative infection and tumors (21-26). In our experience, 10 % of our patients were 1 yr or less and 10% also had tumors, nevertheless, none developed ETV failure. However, due to the small sample of patients, careful interpretation of results must be advocated.
The actual incidence of complication following ETV remains inconclusive, mainly due to the ambiguity in defining what should be considered an adverse complication. The literature describes a number of complications that were not encountered in our series. Such complications include pituitary stalk and hypothalamic damage that usually presents itself as diabetes insipidus (27-28). cardiac arrhythmias and respiratory arrest could occur due to hypothalamic irritation and manipulation (29-30). The most feared of these complications is damage to vascular structures such as the basilar artery due to the close proximity in the perforation field (31-32). In general, the rate of complications for neuroendoscopic interventions, particularly ETV, is reported to be between 6% and 20% (33-34). However, it must be stated that, as in any surgical procedure, a steep learning curve exists and experience will determine the threshold for minimum complications. Our morbidity rate remained low at 3% and a mortality rate of 0%. The only complication encountered in our experience was the emergence of postoperative ventriculitis.
ETV also has health care cost ramifications. A cost-analysis study of performing ETV as an alternative to VPS, in a 2-year period with 150 VPS was performed (35). After analysis, 23 patients were deemed candidates for ETV. Eight of these required a total of 29 new operations and 230 extra days in the hospital. Assuming a (shunt-free) rate for ETV of 80%, it was calculated that nine operations and 74 bed-days per year could be saved using this technique.
ETV remains a safe procedure which, when performed in patients with certain indications, could help control hydrocephalus. Patients with complicated shunt histories and isolated benign aqueductal stenosis remained the group with the highest success rate and less complications. Even though ETV is mainly used for cases with obstructive hydrocephalus, recent data suggest excellent results in cases with non-obstructive hydrocephalus such as normal pressure hydrocephalus (36). It remains to be proven if and when endoscopic third ventriculostmy will be considered the gold standard for patients with hydrocephalus. ETV, when performed correctly by an experienced operator, is a safe, simple and effective treatment for hydrocephalus. A larger sample and further follow up of current patients is needed for better conclusions about ETV's long term benefit and indication profile for our population.
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EMIL A. PASTRANA, MD; LINCOLN M. JIMENEZ, MD; IVAN J. SOSA, MD
Department of Surgery, Neurosurgery Section, University of Puerto Rico, medical Science campus
The information presented in this manuscript has not been presented at any meeting or submitted to any peer-review journal. The authors have no conflict of interest to disclose.
Address correspondence to: Ivan J. Sosa, MD, University of Puerto Rico, medical Science Campus, PO Box 365067 San Juan, PR 00936. Tel: (787) 765-8276 * Fax: (787) 766-0088 * Email: firstname.lastname@example.org
Table 1. Characteristics Sex Male 55% Female 45% Age Mean 36 yrs Range 0-81 yrs Mean Age--Males 36 yrs Mean Age--Females 54 yrs Pediatric (0-18 yrs)--Male 28% Pediatric (0-18 yrs)--Female 0% Adult (18-85 yrs)--Male 72% Adult (18-85 yrs)--Female 100% Signs and Symptoms Adults Headaches 52% Gait disturbances 43% Altered mental status 29% Pediatrics Increased head circumference 38% Etiology Aqueductal stenosis 59% Normal pressure hydrocephalus 17% Tumors 10% Others 14%
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|Author:||Pastrana, Emil A.; Jimenez, Lincoln M.; Sosa, Ivan J.|
|Publication:||Puerto Rico Health Sciences Journal|
|Article Type:||Perspectiva general de la enferm|
|Date:||Dec 1, 2009|
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