Audio Coursesby JellypodLesson 02 of 5
Overview
Heather Murphy: Hey everyone, welcome back to NSG3046 Adult Medical Surgical 2. I’m Heather Murphy, and today we’re gonna dig into something that, honestly, every nurse needs to have a handle on—intracranial pressure, or ICP, and how the brain keeps its blood flow in check. So, let’s start with the basics. Normal ICP, that’s the pressure inside the skull, right? It’s made up of three things: brain tissue, blood, and cerebrospinal fluid. Normally, ICP sits somewhere between 5 and 15 millimeters of mercury. If it creeps above 20 and stays there, that’s when we start to worry.
Heather Murphy: Now, the brain’s actually pretty clever. It’s got this thing called autoregulation, which means it can adjust its own blood flow depending on what it needs—even if your blood pressure is bouncing around. But, if the pressure inside the skull gets too high, that autoregulation can fail, and then you’re looking at decreased cerebral blood flow, which can lead to ischemia and, well, that’s never good.
Heather Murphy: So, what causes increased ICP? There’s a bunch of things. You’ve got masses like hematomas, contusions, abscesses, and tumors. Edema is a big one too—think about swelling from a brain tumor, hydrocephalus, or even after a head injury. Gliomas, for example, are a type of brain tumor that can really ramp up the pressure. I remember this one patient—oh, this was years ago—she came in with just a mild headache and a little confusion. Nothing dramatic at first. But, because we caught those subtle changes early, we were able to get a scan and found a mass before things got out of hand. Early recognition is everything with increased ICP.
Heather Murphy: Alright, so let’s talk about what you actually see when someone’s ICP is going up. The classic signs—well, first, changes in level of consciousness. That’s usually the earliest clue. You might notice they’re a little drowsy, or maybe they’re just not acting like themselves. Then you get changes in vital signs—sometimes a weird blood pressure pattern, or bradycardia. Pupil dilation is another big one, especially if it’s just on one side. Headache and vomiting, especially if it’s sudden and projectile, are also red flags. And don’t forget about motor decline—like weakness or even posturing.
Heather Murphy: Monitoring is huge here. The gold standard is ventriculostomy—that’s where they put a catheter into the ventricle to measure the pressure directly. It’s invasive, but it gives you real-time data and you can even drain CSF if you need to. There are other devices too, but ventriculostomy is still the go-to in most places.
Heather Murphy: I can’t stress enough how much early intervention matters. If you catch increased ICP early and start treatment—whether that’s draining CSF, giving meds like osmotic diuretics, or just controlling fever and pain—you can really change the outcome for that patient. I mean, I’ve seen folks come in looking pretty rough, but with quick action, they walk out of the hospital. Not always, but it’s possible.
Heather Murphy: Now, let’s shift gears a bit and talk about head injuries. This is a huge topic, but I’ll try to keep it focused. Head injury can mean anything from a scalp laceration to a skull fracture to a full-blown traumatic brain injury. We classify brain injuries as minor, moderate, or severe, and we use the Glasgow Coma Scale—GCS for short—to help with that. GCS scores range from 3 to 15, with 15 being fully alert. I remember a case—a young guy, moderate TBI, GCS of 10 when he came in. He had a contusion and some swelling, but because we monitored him closely and managed his ICP, he made a pretty good recovery.
Heather Murphy: Brain tumors are another big cause of increased ICP. The most common ones you’ll see are meningiomas and gliomas. Tumors can show up in all sorts of ways—sometimes it’s a new seizure, sometimes it’s just a headache that won’t quit. Imaging is key here—CT scans are usually first, but MRI gives you more detail. And, just a quick note, tumors don’t usually spread outside the brain, but they can cause a lot of trouble inside.
Heather Murphy: And then there’s the inflammatory stuff—like meningitis and brain abscesses. Bacterial meningitis, in particular, is a medical emergency. I’ll never forget this one patient—came in with a fever, terrible headache, and neck stiffness. We got a CT, did a lumbar puncture, and started antibiotics right away. She needed respiratory isolation, too, because bacterial meningitis is super contagious. The key is to manage the ICP, control the fever, and treat the infection fast.
Heather Murphy: Alright, I think that’s a good place to wrap up for today. We covered a lot—ICP, head injuries, tumors, and those scary infections. There’s always more to learn, so stick with me for future episodes. Thanks for listening, and take care of yourselves out there!
