From what my surgeon told me and like Pogo said, your ICP's are different when you're laying vs standing. When you're sleeping at night your pressure is around 5cm h2o and around -10cm h2o when standing. Depend on the shunt you have, it's most likely not able to mimic your physiological ICP's. If your valve is set too high, which it probably is, your going to be underdraining at night and waking up with symptoms.


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