Increased ICP and head injury

ICP items are about protecting brain perfusion. Spot rising pressure early, keep venous drainage open, and stop the things that shove pressure higher.

What rising ICP looks like

The skull is a rigid box filled with brain, blood, and CSF. When one volume rises, something else must give or pressure climbs (Monro-Kellie idea). Cerebral perfusion pressure is roughly MAP minus ICP. If pressure inside the skull rises or MAP falls, neurons starve. That is why hypotension and high ICP are a paired threat after head injury.

Cushing triad = rising systolic BP with widening pulse pressure, slowing heart rate, and irregular breathing. It is late, not a green light that the client is “compensating fine.” Decorticate (flexion) and decerebrate (extension) posturing are motor signs of severe injury. Decerebrate is generally worse. Report either with the rest of the neuro decline.

Nursing actions that lower pressure

The skull is a closed box. Pressure falls when venous blood can leave the head and when you avoid spikes in cerebral blood volume or intrathoracic/intra-abdominal pressure. Head of bed about 30° with the neck midline keeps jugular veins open; a tight collar, extreme hip flexion, or lying flat for long stretches dams venous return and ICP climbs.

Why space care and soften stool: each suction pass, turn, and painful stimulus can transiently raise ICP. Stack them and you create one prolonged spike the brain cannot clear. Valsalva from constipation does the same through venous backup. Brief suction with pre-oxygenation clears the airway without trading hypoxia or a coughing fit for a pressure surge. Ordered ventilation goals matter because hypercapnia and hypoxia both dilate cerebral vessels and raise blood volume inside the skull. The trap is chasing comfort positioning or “getting everything done at once” while CO₂ and O₂ drift.

The distractor that looks caring is laying the client flat to rest, clustering AM care for efficiency, or suctioning until the airway sounds perfect. Flat and clustered care raise pressure; prolonged suction costs more ICP than a short, oxygenated pass. Edge case: spinal precautions or an ordered flat position after certain injuries override the usual 30° rule: follow the stem’s clearance and still keep the neck neutral when you can.

Head injury specifics

Head trauma adds fracture paths, CSF leaks, and seizure risk on top of the ICP rules above. Basilar skull fracture signs (raccoon eyes, Battle sign, CSF from nose or ear) mean the base of the skull may be open. A nasal NG tube can track into the cranial vault, so do not place one through the nose unless imaging and the provider have cleared that route.

• Basilar skull fracture cues: raccoon eyes, Battle sign, CSF otorrhea/rhinorrhea: do not insert NG tubes through the nose unless cleared.
• CSF leak: allow drainage to a pad as ordered; do not pack the nose/ear tightly or teach nose-blowing.
• Seizure precautions when the cortex is irritated; have suction and oxygen ready.
• Neuro checks on a schedule: compare to the client’s baseline, not a generic “normal.”

CSF leaking from nose or ear is a pathway for meningitis, not a mess to pack shut. Allow drainage to a pad as ordered, skip nose-blowing and tight packing, and watch for fever, stiff neck, and worsening headache. Cortical irritation after injury can trigger seizures: precautions and ready suction/oxygen protect the airway when a fit hits. Serial neuro checks only work if you compare to *this* client’s baseline; a GCS that looks “almost normal” can still be a drop from their earlier exam.

The distractor that looks decisive is packing rhinorrhea, teaching the client to blow hard to clear the nose, or delaying escalation until pupils match a textbook late picture. Packing and Valsalva worsen leak risk and pressure dynamics; waiting for a perfect Cushing triad misses the window. Swallow safety and full stroke-style neuro assessment live in Stroke and Neuro Assessment. Use that chapter when the stem turns on dysphagia or a focused neuro exam rather than ICP mechanics.

Epidural vs subdural patterns

Epidural hematoma is often arterial (classic middle meningeal pattern) after trauma: loss of consciousness, a lucid interval, then rapid decline. That lucid gap is not clearance to send the client home without instructions. Subdural hematoma is often venous bridging-vein bleeding. It may evolve slower, especially in older adults or clients on anticoagulants, with progressive confusion days after a fall. Both need serial neuro checks and escalation when LOC slips. Concussion teaching still includes waking parameters and return precautions as ordered.

Osmotherapy (mannitol pattern)

Hyperosmolar agents pull water from brain tissue into the vascular space. Expect heavy urine output. Watch fluid balance, sodium, and neuro response. Use a filter as ordered for mannitol crystals; hold and clarify if the solution is crystallized. The exam wants recognition that this is acute ICP therapy, not a casual diuretic teaching moment. Hypertonic saline appears on some protocols with the same close sodium and neuro monitoring.

How to reason under time pressure

1. Is the airway and oxygenation intact?
2. Is LOC changing from this client’s baseline?
3. Fix positioning and stop ICP-raising actions before chasing every lab.
4. Escalate late signs immediately. Do not wait for a perfect triad.