An Evaluation of Non-invasive ICP Monitoring in Patients Undergoing Invasive ICP Monitoring Via an External Ventricular Drainage (EVD) Device

ICP monitoring will be done in parallel for both HS-1000 and ICP monitoring via an EVD device (per clinical protocol without any change in the patient's management). HS-1000 ICP monitoring intervals will last from 30 minutes to 6 hours, continuously depending on the patient's clinical condition. Each such interval may occur three times a day or more depending on the clinical condition of the patient.