First off, I will state that I am not a neuro nurse but could use your valueable input!I will be caring for a patient with a resected brain tumor that had a shunt placed which remains very unstable, with his last revision done about 3 1/2 weeks ago. At times he has too much fluid buildup and at others it drains too much to the point he will get severe headaches upon sitting.What are signs that I may need to send him to the ER for shunt failure? Does a shunt failure happen quickly, or slowly with symptoms worsening? Is it always an emergency or do the fluid shifts even out? Any advice you can give in regards to caring for a person with these types of problems would be greatly appreciated. Thanks in advance!