Summary
For many years percutaneous needle and classic burr-hole trephination with insertion of plastic catheters for external ventricular drainage are in use. The shortcomings of the conventional puncture needles were compensated for by the development of a modified instrument in recent years.
In this prospective study we tried to define advantages and disadvantages of percutaneous ventriculostomy with this modified needle in a large number of patients. We treated and followed a total number of 200 patients with external ventricular drainage for various reasons (42% obstructive hydrocephalus, 27% haematocephalus, 11% malresorptive hydrocephalus, 11% elevated ICP and 9% infections). The ventriculostomy is performed — after percutaneous trepheication with a 1.5 mm drill and 1.2 mm needle under the local aesthesia as a bedside procedure. The modified blunt needle is provided with markings and a set screw which allows insertion to a prefixed depth and a sharp guide which is withdrawn after penetration of the dura. It is then bent rostrally and fixed by a plaster cast. The mean duration of drainage was 9 days (1–30 days). Mean operating time for the whole procedure including fixation and connection to the drainage system was 20 minutes. Overall complication rate was 13% (N=26). Two intracerebral haemorrhages (1%) occurred, of which one was caused by overdrainage. Five (3%) infections in primarily not infectious cases (N=182) were seen. Only one case of infection occurred without loosing of the needle on day 17. In 19 patients (10%) the needles had loosened. Fifteen times this complication was repaired in time and no infection occurred. The overall complication rate (13%) and the needle related risk of bleeding (0.5%) seem average. The true risk of infection with correct handling (0.5%) is very low despite the very long average duration of drainage. The main risk lies in the markedly high danger of loosening (10%), which entails a disproportionally high demand for nursing care. Nevertheless, we regard percutaneous needle trephination as the ventriculostomy method of choice because of its better practicability and low infection rate.
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Meyer, B., Schaller, K., Rohde, V. et al. Percutaneous needle trephination. Experience in 200 cases. Acta neurochir 127, 232–235 (1994). https://doi.org/10.1007/BF01808772
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DOI: https://doi.org/10.1007/BF01808772