Intracranial Pressure (ICP) Monitors or Bolts are devices that are used to monitor the Intracranial pressure inside you head. I have had two or these in the past and both have been different.
My First ICP
My first ICP was back in June 2015 Just a few months after my VP Shunt was installed. I was getting some really bad head pain and had difficulty staying upright for prolonged periods of time so my surgeon decided that I should get the ICP moniter for a minimum of 24 hours to see what my pressure was. I didn’t really know what to expect when I arrived at the hospital as I didn’t read up about it before going in. I thought that if I didn’t know what was about to happen I wouldn’t scare myself but that gave me the reverse affect I was so anxious about what was in store for me. There is an option to be put under General Anaesthesia so your asleep for the operation but for some reason I was having mine done under local anaesthesia. When the time came I was taken down to the Pre op area where they get you ready to go to theatre as I was having the procedure done there. The nurses were talking to me throughout to try and keep me calm. Firstly the surgeon shaved the front right part of my head where the bolt was going to be placed. After he cleaned and sterilised the area he made the incision. I felt the blood run down my right ear but didn’t feel anything else. I was expecting some sort of power tool to drill through my skull but instead (by the feeling I was experiencing) and the noise I heard seemed to be a tool similar to cork screw. After a bur hole was made in my skull the surgeon screwed the bolt to my skull and inserted the probe into my brain and connected it to the monitor, which happened to be some main box that converted the signals so that they could be seen on a standard laptop. As the anaesthetic wore off it was painful and uncomfortable it looked like I had an areal coming out of my head. It was in for about 2 days before being taken out whilst I was still in the ward. I had a little local anaesthetic to the area before the doctor pulled the probe out of my head and unscrewed the bolt before stitching me up. It felt very strange at the time and painful after the anaesthetic wore off but the pain didn’t last to long and the procedure went well. My second ICP was a bit different.
My Second ICP
I had an idea for what was in store for me when going in for my 2nd ICP, but this one turned out to be a bit different than the first. It was being planned to be under General Anaesthesia, the reasoning I think is because of my problems with anxiety, but was told before the op that as they had difficulty establishing an air line when I last went under, they didn’t want to take the added risk. So the decision was made for the op to be under local Anaesthesia again. The differences this time were firstly the tools they used to make the bore hole this one resembled the old bit and brace (or like a whisk that has that gear like system) it made a lot more noise and I felt a lot more vibration in my skull. I also felt the probe being inserted a lot more this time than the last and that pain only increased as the Anaesthetic wore off. It was explained to me that the brain has many nerves in different places and that last time I was lucky in the placement of the bolt where as this time they seemed to find an area where i had a lot more nerves and that is what was giving me the pain.
During my time in the hospital for this ICP I was also approached my some Scientists that were doing a study to see if you could measure the intracranial pressure from your ear canals by listening to sound waves. If this turned out to be correct it would mean that you would not need to have surgery every time that you needed your intracranial pressure to be monitored. I agreed to having these extra tests but unfortunately the equipment that they were using malfunctioned and they couldn’t complete the tests.
When the ICP was taken out it hurt a lot more than the last and I experienced vertigo like symptoms similar to when I had my shunt inserted. I panicked as I thought back to previous experiences but luckily after about half a day i started to feel better and was discharged from hospital.