Medical-Surgical Nursing · Nervous System and Chronic Diseases of the Nervous System
Seizures
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In 30 seconds
A Seizure A temporary episode of excessive, synchronous brain electrical activity Full entry → is a sudden, temporary episode of abnormal, excessive, and synchronous electrical activity in the brain that produces a change in movement, sensation, behavior, awareness, or a combination of these. Epilepsy A chronic disorder of recurrent unprovoked seizures Full entry → is the chronic disorder defined by recurrent, unprovoked seizures. Not everyone who has a seizure has epilepsy: a Provoked seizure A seizure caused by a specific trigger such as fever or low blood sugar Full entry → is triggered by something specific and often reversible, such as a high fever, very low blood sugar, alcohol withdrawal, electrolyte imbalance, head injury, or drug toxicity. Seizures are classified broadly as focal (starting in one area of the brain) or generalized (involving both sides from the start). Most seizures end on their own, but a seizure that lasts too long or repeats without recovery — Status epilepticus A seizure that continues too long or repeats without recovery Full entry → — is a medical emergency.
Why this matters
Seizures are common, and nurses encounter them in every setting: the hospital unit, the emergency department, long-term care, and the community. The nurse's actions during a seizure — protecting the person from injury, timing the event, and documenting what was observed — are among the most important clinical contributions in neurology, because the witness description is often the main diagnostic information available. Status epilepticus can cause brain injury if not treated promptly. For people living with epilepsy, medication adherence, safety, and education about triggers and driving rules make the difference between a full life and repeated emergencies. Stigma and fear around seizures are also real, and person-first care ("person with epilepsy") matters.
The college version
Core Concepts
Seizure, provoked seizure, and epilepsy
- Seizure — one episode of abnormal brain electrical activity.
- Provoked seizure — caused by a specific trigger (fever, hypoglycemia, alcohol withdrawal, electrolyte imbalance, injury, toxins). Treat the trigger; the person may never have another seizure.
- Epilepsy — a chronic condition of recurrent unprovoked seizures. It is a disorder, not a single disease; causes include genetic factors, structural brain abnormalities, and previous brain injury.
How a seizure happens (conceptual)
Normally, neurons fire in coordinated, controlled patterns. During a seizure, a group of neurons fires excessively and in synchrony — an "electrical storm" — overwhelming the brain's usual braking systems. Focal seizures begin in one region; generalized seizures engage both hemispheres from the start. The brain's inhibitory circuits normally stop the storm; when they fail to, the seizure continues — and a seizure that continues without recovery (status epilepticus) becomes an emergency because the brain does not return to its normal resting state.
Common seizure types
- Focal aware seizure — starts in one area; the person remains aware. May cause unusual sensations, smells, emotions, or twitching of one body part. (An "Aura A focal aware seizure that signals the start of a larger event Full entry →" is actually a focal aware seizure — the beginning of the event, not a warning that comes before it.)
- Focal impaired awareness seizure — awareness is altered; the person may stare, appear confused, or make repetitive movements (automatisms) such as lip-smacking or picking at clothing.
- Generalized Tonic-clonic seizure Stiffening then rhythmic jerking with loss of consciousness Full entry → — the classic "grand mal": sudden loss of consciousness, body stiffening (tonic phase), then rhythmic jerking (clonic phase), followed by a deep post-ictal sleep or confusion.
- Absence seizure Brief staring spell with unresponsiveness Full entry → — brief (seconds-long) staring with unresponsiveness, often in children; the person abruptly stops, blinks, and resumes as if nothing happened.
- Myoclonic seizure — sudden brief jerks of a muscle or group of muscles.
- Atonic seizure Sudden loss of muscle tone causing a drop Full entry → — sudden loss of muscle tone causing the person to drop or fall ("drop attack").
Triggers and provoking factors
Common triggers for seizures in people with epilepsy include missed doses of antiseizure medication, sleep deprivation, stress, illness with fever, alcohol use or withdrawal, and (in some photosensitive people) flashing or flickering lights. For provoked seizures, the trigger is the cause: fever in young children, low blood sugar, electrolyte disturbances, alcohol withdrawal, and head injury are examples.
Status epilepticus: the emergency
Status epilepticus is a seizure that continues too long or a series of seizures without the person recovering consciousness in between. It is a medical emergency: the longer it continues, the higher the risk of brain injury. The nurse's role is to protect the airway and the person, time the event, activate the emergency response per institutional protocol, and be ready to assist with emergency medications and monitoring ordered by the provider. The exact time threshold that triggers emergency response follows facility protocol and prescriber orders.
Nursing care during and after a seizure
During: ease the person to the floor or a safe surface, cushion the head, move hard or sharp objects away, loosen tight clothing, and turn the person onto their side if possible to let secretions drain. Time the seizure from start to finish and stay with the person. Do not restrain the person, do not put anything in the mouth (no fingers, no tongue blades — a person cannot swallow their tongue, and objects cause injury), and do not try to hold the person still. Activate help and administer emergency medications only per orders and protocol.
After (post-ictal): the person may be confused, drowsy, or combative. Position for airway safety, reorient gently, check for injuries (tongue bite, head injury, bruises), monitor vital signs, and notify the healthcare provider. Document exactly what you observed: how it started, what body parts moved, whether the person lost awareness, how long it lasted, and the recovery phase.
Education for the person with epilepsy
- Take antiseizure medication exactly as prescribed; missed doses are one of the most common causes of breakthrough seizures.
- Keep a seizure diary: date, time, triggers, description, duration.
- Safety: shower rather than bathe (or never bathe alone), avoid swimming without supervision, avoid heights and operating dangerous machinery during seizure-prone periods.
- Driving: follow local laws and the healthcare provider's guidance; many jurisdictions require a seizure-free period and reporting.
- Wear medical identification and have a seizure action plan.
- Know when to seek emergency care: a seizure lasting longer than the person's usual pattern, repeated seizures without recovery, first-time seizure, injury, or pregnancy.
Common Confusions
| Do Not Confuse | With | Difference |
|---|---|---|
| A seizure | Epilepsy | One event vs a chronic disorder of recurrent unprovoked seizures |
| An aura | A warning that comes before the seizure | The aura IS the seizure — a focal aware seizure that starts the event |
| Absence seizure | Daydreaming or inattention | Absence: abrupt, unresponsive, brief, often with blinking; the person cannot be "snapped out of it" |
| Atonic seizure | Fainting (syncope) | Sudden loss of muscle tone (drop) vs loss of consciousness from inadequate blood flow; atonic falls are a hallmark of a seizure disorder |
| Febrile seizure | Epilepsy | A provoked seizure from fever in a young child; most children do not develop epilepsy |
| Restraining during a seizure | Protecting the person | Restraint causes injury; protection means cushioning, clearing hazards, and timing |
Eli explains
The same idea, in plain words
Explain it like I’m 10
Your brain sends messages with tiny electrical signals. A seizure is like a sudden electrical storm in the brain: too many signals fire at once, and the person's body or awareness does something unusual for a short time. If the storm happens once because of something like a high fever, that is not epilepsy; epilepsy means the storms keep happening without a clear reason. If a storm goes on too long, it is an emergency and helpers should call for medical help.
Worked example
While making rounds, a nurse sees a patient suddenly stiffen, fall back against the bed, and begin rhythmic jerking of the arms and legs. The nurse calls for help, notes the time, eases the patient onto the mattress, removes the pillow and pulls the bedside table away, loosens the gown collar, and turns the patient's head to the side. She does not restrain the arms, does not put anything between the teeth, and does not try to stop the movements. A colleague activates the emergency response per unit protocol. The jerking stops after about 90 seconds; the patient is drowsy and confused. The nurse stays at the bedside, checks the airway, monitors breathing and vital signs, looks for injuries including a possible tongue bite, and documents the event: sudden onset, generalized stiffening then jerking, loss of awareness, duration, and slow recovery. She then reports to the provider and reviews the medication record for missed antiseizure doses — a common cause of breakthrough seizures. Her documentation becomes the cornerstone of the diagnostic record.
Key takeaways
- A seizure is one event; epilepsy is recurrent unprovoked seizures.
- Provoked seizures have a trigger (fever, hypoglycemia, alcohol withdrawal, electrolyte imbalance) — treat the trigger.
- Never restrain, never put anything in the mouth — protect the head, side-lying, time it, stay with the person.
- Status epilepticus is a medical emergency — activate the response per protocol.
- The witness description is diagnostic gold: onset, movements, awareness, duration, post-ictal state.
- Missed medication is a leading trigger for breakthrough seizures.
- An aura is a focal seizure, not a separate warning.
- Person-first: person with epilepsy.
Check yourself
6 review questions from the chapter. Try each one, then open the answer.
What is the difference between a provoked seizure and epilepsy?
Show answer
A provoked seizure has a specific trigger (fever, low blood sugar, alcohol withdrawal, electrolyte imbalance) and may never recur; epilepsy is a chronic condition of recurrent unprovoked seizures.
List the four things a nurse should do — and two things a nurse must never do — during a seizure.
Show answer
Do: ease the person to a safe surface, cushion the head, turn to the side if possible, time the seizure, clear hazards, stay with the person, activate help per protocol. Never: restrain the person or put anything in the mouth.
Why is status epilepticus a medical emergency?
Show answer
Because a seizure that continues too long or repeats without recovery can cause brain injury; it requires urgent emergency response.
What is an aura, and why does calling it a "warning" mislead?
Show answer
An aura is a focal aware seizure — the beginning of the seizure event, not a separate warning that occurs before it.
Name three common triggers for breakthrough seizures in a person with epilepsy.
Show answer
Missed antiseizure medication, sleep deprivation, stress or illness with fever, alcohol use or withdrawal, and (in some people) flashing lights.
What should the nurse document after witnessing a seizure?
Show answer
Onset and how it started, body parts involved, whether awareness was lost, duration, post-ictal recovery, injuries noted, and any potential triggers.
Study tools & related lessonsKey vocabulary · Related
Key vocabulary
- Seizure
- A temporary episode of excessive, synchronous brain electrical activity
- Epilepsy
- A chronic disorder of recurrent unprovoked seizures
- Provoked seizure
- A seizure caused by a specific trigger such as fever or low blood sugar
- Focal seizure
- Starts in one area of the brain
- Generalized seizure
- Involves both brain hemispheres from the start
- Tonic-clonic seizure
- Stiffening then rhythmic jerking with loss of consciousness
- Absence seizure
- Brief staring spell with unresponsiveness
- Atonic seizure
- Sudden loss of muscle tone causing a drop
- Aura
- A focal aware seizure that signals the start of a larger event
- Post-ictal phase
- The confused, drowsy period after a seizure
- Status epilepticus
- A seizure that continues too long or repeats without recovery
Sources & references
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