Neurosurgery ICU EVD Management 

Often taught, but not necessary. “Zeroing” is calibrating the monitor to atmospheric pressure. There will be insignificant difference between the 0cmh20 and the 20cmh20 markings. You’d have to open the transducer five stories higher to make a difference in the reading.

@@Everybodypoops2 in addition the stopcock closest to the transducer mechanism should be turned off to the patient,. Then it should be open to the air. In the video it is turned off to the transducer when it is open to the air, this would not work. Once the closest stopcock is closed to the patient and the rest of the system, it does not matter what you do with the burette.

@@richardbernardi7249Exactly!!! You are absolutely right. I care for these on a daily basis and tried many different things with them. The policy at my hospital states to lower the buretrol when zeroing. The educators also teach this; however, I do not understand the rationale here, or what we are accomplishing, since during zeroing the stopcock is off to drain and to the patient and only open to atmosphere and monitor. If the stopcock is off to the drainage chamber, the position of that chamber is meaningless. I've zeroed with the chamber low and high; the number is the same. The only thing i can think of is, stopcock closed to the patient, and open to drain / atmosphere / monitor, then the chamber would be lowered and when it's raised above zero that would be the ICP number, but the stopcock does not allow this scenario.... that's not how it works. He showed in the video zeroing with the stopcock closed to transducer....it does not work that way; you cannot zero with the transducer closed.

I think you are correct. That’s how I learned it. You zero it by dropping it to zero then you zero it and adjust it to where the physicians wants it

My hospital doesn't do this and it's magnet/comp. stroke center hospital so maybe it's not necessary. Just do whatever your hospital policy is.