External ventricular drain causes brain tissue damage: an imaging study

  • Fabrizio Ortolano
  • Marco Carbonara
  • Antonella Stanco
  • Vittorio Civelli
  • Giorgio Carrabba
  • Tommaso Zoerle
  • Nino Stocchetti
Original Article - Neurosurgical Techniques
  • 21 Downloads

Abstract

Background

An external ventricular drain (EVD) is used to measure intracranial pressure (ICP) and to drain cerebrospinal fluid (CSF). The procedure is generally safe, but parenchymal sequelae are reported as a possible side effect, with variable incidence. We investigated the mechanical sequelae of EVD insertion and their clinical significance in acute brain-injured patients, with a special focus on hemorrhagic lesions.

Methods

Mechanical sequelae of EVD insertion were detected in patients by computed tomography (CT) and magnetic resonance imaging (MRI), performed for clinical purposes.

Results

In 155 patients we studied the brain tissue surrounding the EVD by CT scan (all patients) and MRI (16 patients); 53 patients were studied at three time points (day 1–2, day 3–10, >10 days after EVD placement) to document the lesion time course. Small hemorrhages, with a hyperdense core surrounded by a hypodense area, were identified by CT scan in 33 patients. The initial average (hyper- + hypodense) lesion volume was 8.16 ml, increasing up to 15 ml by >10 days after EVD insertion. These lesions were not accompanied by neurologic deterioration or ICP elevation. History of arterial hypertension, coagulation abnormalities and multiple EVD insertions were significantly associated with hemorrhages. In 122 non-hemorrhagic patients, we detected very small hypodense areas (average volume 0.38 ml) surrounding the catheter. At later times these hypodensities slightly increased. MRI studies in 16 patients identified both intra- and extracellular edema around the catheters. The extracellular component increased with time.

Conclusion

EVD insertion, even when there are no clinically important complications, causes a tissue reaction with minimal bleedings and small areas of brain edema.

Keywords

External ventricular drain Brain hemorrhage Brain edema Intracranial pressure monitoring Brain damage 

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Copyright information

© Springer-Verlag GmbH Austria 2017

Authors and Affiliations

  1. 1.Neuroscience Intensive Care UnitFondazione IRCCS Ca’ Granda Ospedale Maggiore PoliclinicoMilanItaly
  2. 2.Department of Physiopathology and TransplantUniversity of MilanMilanItaly
  3. 3.Neuroradiology UnitFondazione IRCCS Ca’ Granda Ospedale Maggiore PoliclinicoMilanItaly
  4. 4.Neurosurgery UnitFondazione IRCCS Ca’ Granda Ospedale Maggiore PoliclinicoMilanItaly

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