I chose the topic of external intracranial monitoring and drainage devices as a teaching topic for my PN teaching project. I'm way over my head. I've spent hours trying to understand the nurses responsibility and how and why she levels, zero's out, .....I'm in over my head. I need this in Dummies terms. I am writing a 5 page paper and am to give a 10 minute presentation....Please have mercy and help me...BTW...icufaqs.com: icp monitoring was over my head too.