An example of a healthcare provider order regarding an EVD is: Level external ventricular drain to 15 cmH20 above midbrain, open to drain continuously, check and record cerebrospinal fluid drainage and intracranial pressure every hour.
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The system used two, later three, hydrogen filled balloons positioned above each other along a common tether to support a 9 metre diameter resin-bonded terylene spherical radome inflated by a built-in fan to a pressure of 980 pascals (10 cm H2O).