What is external drainage?
External drainage and monitoring is the temporary drainage of cerebrospinal fluid (CSF) from the lateral ventricles of the brain, or the lumbar space of the spine, into an external collection bag. An external ventricular drainage (EVD) system drains CSF by using a combination of gravity and intercerebral pressure.
How does an Extraventricular drain work?
How does the EVD work? The EVD tube connects to a collection system that lets the CSF drain into a bag hanging on a pole. The surgeon orders the pressure levels to keep the brain fluid pressure correct. Your child’s nurse adjusts the EVD zero line so it’s level with your child’s ear.
What is a Ventriculostomy drain?
An external ventricular drain (EVD), also known as a ventriculostomy or extraventricular drain, is a device used in neurosurgery to treat hydrocephalus and relieve elevated intracranial pressure when the normal flow of cerebrospinal fluid (CSF) inside the brain is obstructed.
What is a Codman drain?
The Codman EDS 3TM is a closed system for drainage and pressure monitoring of external ventricular catheters (EVD). An antimicrobial filter located at the top of the graduated collecting chamber and bottom of the drainage collecting bag prevents backward flow of fluid or bacteria.
What are EVDs used for?
External ventricular drains (EVDs) are commonly used in neurosurgery in different conditions but frequently in the management of traumatic brain injury (TBI) to monitor and/or control intracranial pressure (ICP) by diverting cerebrospinal fluid (CSF).
What is a ventriculostomy used for?
A ventriculostomy is the gold standard for ICP monitoring. It can be inserted through a twist drill craniostomy at the bedside and can also be used to drain CSF or for the estimation of intracranial compliance. The catheter is connected to a fluid-filled system, which is connected to an external transducer.
How do I zero my ICP monitor?
Zeroing
- The ICP only requires ‘zeroing’ if requested by the Codman™ monitor.
- Codman™ monitor should be connected to the Phillips™ monitor via the ICP monitor cable into the transducer.
- Turn the Codman™ monitor on and press ‘0’
- On the Phillips™ monitor, press the ‘Zero’ button.
How much CSF can you drain per hour?
In the neurologically intact patient: Drain CSF to goal pressure of <10mmHg. However, do not drain more than 15ml per hour.
What happens if CSF is not drained properly?
CSF also provides nutrients to your nervous system. CSF is constantly being made and absorbed by your body. CSF moves through ventricles before it drains out and gets absorbed into your bloodstream. When CSF cannot drain properly, the fluid pressure may cause the ventricles to swell.
