What is an External Ventricular Drain Industry?An external ventricular drain (EVD) is a medical device that is used to drain excess cerebrospinal fluid (CSF) from the brain's ventricles. CSF forms in the brain's ventricles and acts as a cushion or buffer for the brain and spinal cord. When excess CSF builds up in the ventricles, it causes increased pressure in the brain known as hydrocephalus....
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