Normally ICP can rise to 80-100mmHg just when coughing/straining,think of neuro patients when they cough on the tube....
CSF is produced at 500 ml/day with a total of 150 ml in the system. This means there’s continuous circulation reabsorption.
The two types of hydrocephalus are:
- obstructive – expect big lateral ventricles and normal 4th as there’s a blockage somewhere
- communicating – general big ventricles but all the piping is OK, it’s the filter/drain that’s blocked – think blood pluggin the arachnoid villi.
- volume expander
- osmotic diuretic