Medical-Surgical Nursing · Nervous System and Chronic Diseases of the Nervous System
Acute Disorders of the Nervous System
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In 30 seconds
Acute disorders of the nervous system strike suddenly — within minutes to hours — and demand rapid recognition and response. The two major families are cerebrovascular events (stroke and transient ischemic attack) and acute central nervous system infections (Meningitis Inflammation of the membranes around the brain and spinal cord Full entry → and Encephalitis Inflammation of brain tissue itself, often viral Full entry →). What unites them is time: brain tissue is exquisitely sensitive to oxygen deprivation and inflammation, and irreversible damage accumulates with every passing minute — in stroke, "time is brain"; in meningitis, a headache and stiff neck can progress to catastrophe within hours.
Stroke is the paradigm: blood supply to part of the brain is interrupted, in two mechanical flavors — Ischemic stroke Brain injury from a blocked blood vessel Full entry →, where a vessel is blocked (by a clot or debris), and Hemorrhagic stroke Brain injury from a ruptured blood vessel Full entry →, where a vessel ruptures and blood leaks into or around the brain. Both destroy brain tissue — one by starving it, the other by flooding it — and both are medical emergencies. A Transient ischemic attack (TIA) Brief, fully resolving stroke-like episode Full entry → is a brief episode of stroke-like symptoms that resolves completely, but it is not "nothing": it warns of an impending stroke and requires urgent evaluation.
Why this matters
Stroke is a leading cause of serious long-term disability and death, and it is both treatable and preventable when recognized early. Public education — the FAST Face, Arms, Speech, Time — stroke recognition mnemonic Full entry → mnemonic (Face, Arms, Speech, Time) — has saved countless lives by teaching people to recognize facial droop, arm weakness, and speech difficulty and to call for help immediately. In the hospital, nurses are the first line of detection: a patient whose symptoms began on the unit, a patient who suddenly cannot speak, a family member reporting "she just started acting strange" — each is a potential stroke where minutes count.
Acute CNS infections matter just as urgently. Meningitis (inflammation of the membranes around the brain and spinal cord) and encephalitis (inflammation of brain tissue itself) can be caused by viruses or bacteria. Bacterial meningitis in particular can progress rapidly and is treated as an emergency; early recognition — fever, severe headache, stiff neck — and immediate reporting can be life-saving. The nurse rarely makes the diagnosis, but is usually the first professional to hear the story and see the patient.
The college version
Core Concepts
Stroke: two mechanisms, one emergency
- Ischemic stroke (~the majority of strokes): a vessel supplying the brain is blocked, cutting off oxygen and glucose to the territory beyond. Blockages come from thrombi (clots forming in place, often on atherosclerotic plaque) or emboli (clots or debris traveling from elsewhere, such as the heart). Treatment is time-critical, with the window measured from the Last known well The time the person was last observed symptom-free Full entry → time.
- Hemorrhagic stroke: a vessel ruptures. Blood under pressure damages brain tissue directly and can raise intracranial pressure (connecting to the previous topic). Hemorrhage can occur within brain tissue (intracerebral) or around the brain (subarachnoid). The priorities differ from ischemic stroke, which is why determining the type — usually by rapid brain imaging — comes first.
- TIA: stroke-like symptoms that resolve, typically within minutes to an hour — the blockage was temporary. A TIA is a warning sign: the patient is at high risk of a full stroke and needs urgent evaluation.
Recognizing stroke: FAST and beyond
The public mnemonic:
- F — Face: ask the person to smile; does one side droop?
- A — Arms: ask the person to raise both arms; does one drift down?
- S — Speech: ask the person to repeat a sentence; is speech slurred or strange?
- T — Time: if any of these signs are present, call emergency services immediately and note when the person was last known well.
Beyond FAST, stroke can present as sudden confusion, vision changes, severe headache, trouble walking, dizziness, or loss of balance. Deficits reflect the brain area affected: unilateral weakness, facial droop, speech difficulty, or neglect of one side of space. The nurse establishes a baseline and timeline — especially the last-known-well time, which the team needs immediately.
Meningitis and encephalitis
- Meningitis: inflammation of the meninges. Classic cues are fever, severe headache, and Nuchal rigidity Stiff neck; difficulty bending the chin to the chest Full entry → (stiff neck — difficulty touching the chin to the chest). Photophobia, nausea, vomiting, and altered consciousness can follow. Bacterial meningitis is a rapidly progressive emergency.
- Encephalitis: inflammation of brain tissue itself, often viral. Because brain tissue is affected, symptoms lean toward altered mental status — confusion, behavioral changes, seizures, focal deficits — plus fever and headache.
Nursing priorities for both: recognize and report immediately, implement droplet precautions per facility policy when meningitis is suspected, monitor neurologic status, and support the patient and family. Treatment is directed by the medical team; the nurse's job is detection, protection, monitoring, and education — not prescribing.
Nursing care of the acute stroke patient
Before and during definitive treatment, priorities are physiologic support and prevention of complications:
- Airway, breathing, and circulation are assessed first; the patient may need oxygen support, positioning, and suctioning, with attention to aspiration risk.
- Neurologic monitoring: frequent, standardized neuro checks to detect worsening; any decline is reported immediately.
- Swallowing assessment before any oral intake — Dysphagia Difficulty swallowing is common after stroke, and aspiration is a leading complication. Nothing is given by mouth until the patient is evaluated per protocol.
- Safety: falls risk (weakness, neglect, altered judgment), seizure precautions if indicated, and repositioning to protect skin.
- Prevention teaching: blood pressure control, management of conditions like diabetes and atrial fibrillation, smoking cessation, physical activity, and medication adherence — delivered within the nurse's scope and the patient's plan of care.
- Family support: stroke changes lives in an instant; clear communication and involvement of the interprofessional team (speech, physical, and occupational therapy) are part of nursing care.
Common Confusions
| Do Not Confuse | With | Difference |
|---|---|---|
| Ischemic stroke | Hemorrhagic stroke | Blocked vessel vs. ruptured vessel; treatment priorities differ, so brain imaging comes first |
| TIA | "Nothing happened" | TIA symptoms resolve, but the patient is at high risk of a full stroke and needs urgent evaluation |
| Stroke | Seizure | Stroke is a vascular event; a seizure is abnormal electrical activity. Both are emergencies with different presentations |
| Meningitis | Encephalitis | Meningitis inflames the meninges (headache, stiff neck, fever); encephalitis inflames brain tissue (confusion, seizures) |
| "Symptoms stopped, so we can relax" | Continued vigilance | A resolved TIA still requires rapid medical evaluation; deficits can also evolve or fluctuate |
| Waiting to confirm before reporting | Reporting suspected stroke immediately | The nurse does not need a diagnosis to activate the response — suspicion plus last-known-well time is what the team needs |
Eli explains
The same idea, in plain words
Explain it like I’m 10
A stroke is like a road problem in the brain's delivery system: sometimes a road is blocked (ischemic) and the neighborhood gets no supplies; sometimes a pipe bursts (hemorrhagic) and water floods the streets. Either way, the neighborhood is damaged fast, so we call for help the second we see the signs — a droopy face, a weak arm, or strange speech. A TIA is a short roadblock that clears by itself, but it warns that a bigger one may be coming.
Worked example
At 09:00, Mrs. Novak, age 74, is sitting up in bed when her husband notices her face looks "crooked" when she talks and her right arm is not moving as she reaches for her water; her words come out slurred. He calls the nurse immediately. The nurse observes the facial droop and right-sided weakness and asks the husband when his wife was last completely normal — he says 08:45. She notifies the provider and activates the facility's acute stroke pathway, while keeping Mrs. Novak NPO, positioning her safely, and monitoring her neurologic status minute by minute. The reasoning thread: recognize the sudden focal deficit → establish last known well → act fast → protect airway and swallowing while the team takes over. The same applies to a TIA — even if symptoms had already resolved, the nurse would still insist on urgent evaluation.
Key takeaways
- Stroke is an emergency: time is brain. Ischemic (blocked vessel) vs. hemorrhagic (ruptured vessel) — imaging determines which.
- FAST (Face, Arms, Speech, Time) is the recognition tool; last known well time is the key piece of information for the treatment team.
- TIA: symptoms resolve, but it is a warning sign of high stroke risk — urgent evaluation, not reassurance.
- Sudden unilateral weakness, facial droop, speech difficulty, vision loss, or severe unexplained headache = stroke until proven otherwise.
- Meningitis classic cues: fever, severe headache, stiff neck; progresses rapidly — report immediately and implement policy-directed droplet precautions.
- Encephalitis affects brain tissue: altered mental status, confusion, behavioral change, seizures.
- Post-stroke priorities: airway, neuro monitoring, nothing by mouth until swallowing is assessed (aspiration risk), falls prevention, skin protection.
Check yourself
6 review questions from the chapter. Try each one, then open the answer.
What is the difference between an ischemic stroke and a hemorrhagic stroke?
Show answer
Ischemic stroke is a blocked vessel cutting off oxygen to brain tissue; hemorrhagic stroke is a ruptured vessel leaking blood. Imaging distinguishes them because treatment priorities differ.
Why is a TIA considered an emergency even though symptoms resolve?
Show answer
Because TIA symptoms resolve but the underlying risk remains: a TIA warns that a disabling stroke may follow, so urgent evaluation is needed.
Recite the FAST mnemonic and explain what "Time" refers to.
Show answer
Face (facial droop), Arms (arm drift), Speech (slurred or strange), Time (call emergency services immediately and note last known well).
What are the classic presenting cues of meningitis, and why is bacterial meningitis treated as an emergency?
Show answer
Fever, severe headache, and nuchal rigidity (stiff neck). Bacterial meningitis can progress rapidly — within hours — so recognition and immediate reporting are life-saving.
Why must a patient with suspected stroke receive nothing by mouth until swallowing is assessed?
Show answer
Stroke frequently causes dysphagia (difficulty swallowing); giving food or fluids before a swallowing assessment risks aspiration into the lungs.
What is the single most important piece of timeline information to obtain from a witness of a suspected stroke?
Show answer
The last-known-well time — the moment the person was last observed symptom-free — because it anchors the treatment window.
Study tools & related lessonsKey vocabulary · Related
Key vocabulary
- Ischemic stroke
- Brain injury from a blocked blood vessel
- Hemorrhagic stroke
- Brain injury from a ruptured blood vessel
- Transient ischemic attack (TIA)
- Brief, fully resolving stroke-like episode
- FAST
- Face, Arms, Speech, Time — stroke recognition mnemonic
- Last known well
- The time the person was last observed symptom-free
- Nuchal rigidity
- Stiff neck; difficulty bending the chin to the chest
- Meningitis
- Inflammation of the membranes around the brain and spinal cord
- Encephalitis
- Inflammation of brain tissue itself, often viral
- Dysphagia
- Difficulty swallowing
Sources & references
This lesson was adapted from the open educational references above; their licenses and attributions are preserved. See Copyright & Licensing.
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