of the Week:
If the pressure on the bedside monitor exceeds 7.4 mmHg, CSF should begin to drain from the ventricular catheter.
When the system is open to drainage, and the drainage collecting chamber is placed 10 cm above the ear, a gradient for drainage exists if the intracranial pressure exceeds 10 cm H20. A pressure of 10 cm H20 is = to a pressure of 7.4 mmHg. Thus, drainage will occur if there is CSF in the ventricles, and the ICP > 10 cmH20 or > 7.4 mmHg (bedside monitor).
March 31, 2000