Seizure, Infectious, and Degenerative Neurologic Disorders - Cheat Sheet
Your last-minute revision companion for high-yield neurologic emergencies, infections, and degenerative conditions heavily tested on the NLE. Master seizure management, bacterial meningitis priorities, the myasthenic vs. cholinergic crisis differential, and the clinical hallmarks of Parkinson's, MS, ALS, GBS, and Alzheimer's.
SEIZURES AND EPILEPSY
Important facts
- DURING SEIZURE: Turn patient to lateral (side) position to prevent aspiration; loosen tight clothing; protect the head; do NOT restrain and do NOT force anything in the mouth.
- ASSESSMENT during seizure: Time the seizure, note characteristics (aura, eye movements, incontinence, progression).
- AFTER SEIZURE: Keep on side, reorient, check for injuries, allow rest; postictal period is normal (drowsiness, confusion).
- Seizure types in order of medical emergency: Status epilepticus >> generalized tonic-clonic >> focal with LOC >> focal without LOC >> absence.
- Status epilepticus = MEDICAL EMERGENCY: risk of hypoxia, hyperthermia, brain injury, death.
- FIRST-LINE treatment for acute seizure: IV benzodiazepines (lorazepam or diazepam) STAT.
- SECOND-LINE: Load with longer-acting antiseizure drug (phenytoin, fosphenytoin, or levetiracetam) AFTER benzodiazepine.
- NEVER abruptly stop antiseizure medications—can trigger status epilepticus.
- Patient teaching: Wear medical identification, follow local driving restrictions, avoid alcohol, maintain steady drug levels, report breakthrough seizures.
Key definitions
Seizure
Example
A generalized tonic-clonic seizure with stiffening followed by rhythmic jerking.
Sudden, abnormal, excessive electrical discharge of neurons.
Epilepsy
Example
A patient with a history of 3+ unprovoked seizures over 6 months.
Chronic disorder of recurrent, unprovoked seizures.
Status Epilepticus
Example
Back-to-back tonic-clonic seizures lasting 12 minutes without recovery; medical emergency.
Continuous seizure activity ≥5 minutes or repeated seizures without regaining consciousness between them.
Generalized Seizure
Example
Generalized tonic-clonic, absence, myoclonic seizures.
Involves both cerebral hemispheres; patient loses consciousness.
Focal Seizure
Example
Focal motor seizure causing jerking of one arm; patient may stay aware.
Begins in one specific brain area; may or may not have loss of consciousness.
Absence Seizure
Example
Child suddenly stares blankly for 10 seconds, then continues activity unaware of the lapse.
Brief staring spell, usually 5–10 seconds, with no motor activity; most common in children.
Diagrams to know
- Phases of generalized tonic-clonic seizure: aura → tonic (stiffening) → clonic (jerking) → postictal
- Seizure management algorithm: Safety → Airway → Time → Observation → Medication
- Status epilepticus hierarchy: Assess ABCs → Glucose check → IV benzodiazepine → Load antiseizure drug → Support
ANTISEIZURE MEDICATIONS
Common values
Value
10–20 mcg/mL
Symbol
TL
Quantity
Phenytoin therapeutic level
Value
≤50 mg/min
Symbol
Rate
Quantity
Phenytoin IV infusion rate
Important facts
- Phenytoin IV: Give in normal saline ONLY (precipitates in dextrose); give slowly ≤50 mg/min to avoid hypotension and dysrhythmias.
- Phenytoin therapeutic level: 10–20 mcg/mL (some sources 8–12); above 20 = toxicity.
- Phenytoin side effects: Gingival hyperplasia (teach meticulous oral hygiene), nystagmus, ataxia, diplopia, hirsutism, rash.
- Phenytoin drug interactions: High protein binding; interacts with warfarin, oral contraceptives, many others.
- Carbamazepine: Induces own metabolism (autoinduction); monitor for hyponatremia, rash (SJS risk), CBC.
- Lamotrigine: Risk of Stevens-Johnson syndrome (SJS)—teach patient to report rash immediately.
- Benzodiazepines (lorazepam, diazepam): Acute seizure termination; watch for respiratory depression and sedation.
- Dosing consistency is CRITICAL: Missed doses → low levels → breakthrough seizures → status epilepticus.
- High-protein meals can interfere with phenytoin and levodopa absorption—space from meals.
Key definitions
Phenytoin (Dilantin)
Example
Loading dose 15–20 mg/kg IV at ≤50 mg/min in normal saline only.
Mainstay antiseizure drug; directly stabilizes neuronal membranes.
Levetiracetam (Keppra)
Example
Often preferred for renal failure or polypharmacy situations.
Modern antiseizure drug; no protein binding, fewer drug interactions.
Valproic Acid (Depakote)
Example
Monitor LFTs and platelets; risk of hepatotoxicity and thrombocytopenia.
Broad-spectrum antiseizure drug; requires liver and platelet monitoring.
Diagrams to know
- Drug levels: subtherapeutic → therapeutic (10–20) → toxic (>20) and correlation with seizure control vs. side effects
CENTRAL NERVOUS SYSTEM INFECTIONS
Common values
Value
>100 mg/dL (typically 200–500)
Symbol
Protein_B
Quantity
Bacterial meningitis CSF protein
Value
<40 mg/dL or ratio <0.4
Symbol
Glucose_B
Quantity
Bacterial meningitis CSF glucose
Value
≥40 mg/dL (normal)
Symbol
Glucose_V
Quantity
Viral meningitis CSF glucose
Value
IMMEDIATELY (no delay)
Symbol
T_Abx
Quantity
Time to start antibiotics in bacterial meningitis
Important facts
- CLASSIC TRIAD of bacterial meningitis: Fever + Severe Headache + Nuchal Rigidity (stiff neck).
- Associated symptoms: Photophobia, altered LOC, seizures, nausea, vomiting, confusion.
- Lumbar puncture (LP) findings—BACTERIAL vs. VIRAL:
- • BACTERIAL: Cloudy CSF; HIGH protein (>100 mg/dL); LOW glucose (<40 mg/dL or CSF:blood ratio <0.4); HIGH neutrophils (>80%); HIGH pressure.
- • VIRAL: Clear CSF; Normal/mildly elevated protein; Normal glucose (>40 mg/dL); Lymphocytes (not neutrophils); Normal or slightly elevated pressure.
- MENINGOCOCCAL MENINGITIS → petechial/purpuric rash + can progress to Waterhouse-Friderichsen syndrome (septic shock, adrenal failure, DIC).
- DO NOT DELAY ANTIBIOTICS in suspected bacterial meningitis—start empiric IV antibiotics BEFORE culture results.
- Common empiric regimens: Ceftriaxone ± vancomycin ± ampicillin (depends on age, local resistance patterns).
- Dexamethasone (corticosteroid) given with or before antibiotics to reduce ICP and complications.
- DROPLET PRECAUTIONS for meningococcal and H. influenzae meningitis until 24 hours of effective antibiotics.
- Prophylaxis for close contacts (meningococcal, H. influenzae): Rifampin, ciprofloxacin, or ceftriaxone.
- Nursing environment: Quiet, dimly lit room (photophobia); monitor ICP; manage headache; monitor vitals and neuro status closely.
- Herpes encephalitis: Treat immediately with IV acyclovir (don't wait for confirmation); mortality high without treatment.
- Japanese encephalitis (arbovirus endemic in Philippines): Vector control and vaccination are key prevention; supportive care for cases.
Key definitions
Meningitis
Example
Fever + severe headache + nuchal rigidity = bacterial meningitis until proven otherwise.
Inflammation of the meninges (dura, arachnoid, pia); bacterial or viral.
Bacterial Meningitis
Example
A febrile patient with fever 39°C, severe headache, and stiff neck that should receive antibiotics immediately.
Life-threatening infection of meninges; most common organisms: N. meningitidis, S. pneumoniae.
Viral Meningitis
Example
CSF shows lymphocytic pleocytosis, normal glucose, clear fluid.
Inflammation of meninges by virus; generally self-limiting; milder than bacterial.
Encephalitis
Example
Fever + altered mental status + seizures = encephalitis.
Inflammation of brain tissue itself; often viral (HSV is most common sporadic; arboviruses in tropics like Philippines).
Kernig's Sign
Example
Patient supine, hip/knee flexed to 90°; extending knee causes pain or resistance.
Pain or resistance when extending the knee with the hip flexed; suggests meningitis.
Brudzinski's Sign
Example
Neck flexion automatically causes the patient's hips and knees to flex.
Involuntary hip/knee flexion when the neck is flexed; suggests meningitis.
Petechial/Purpuric Rash
Example
Non-blanching rash on extremities and trunk in meningococcal meningitis; sign of septicemia.
Small red/purple spots (petechiae) or larger blotches (purpura) on skin; seen in meningococcemia.
Diagrams to know
- CSF findings: Bacterial (cloudy, high protein, low glucose, neutrophils) vs. Viral (clear, normal glucose, lymphocytes)
- Meningitis pathway: Infection → Meningeal inflammation → Classic triad → Complications (sepsis, DIC, seizures)
- Kernig's and Brudzinski's signs: How to elicit and what positive result looks like
PARKINSON'S DISEASE
Important facts
- CLASSIC TRIAD: Tremor (resting, pill-rolling) + Rigidity (cogwheel) + Bradykinesia (slow movement).
- Additional features: Postural instability, shuffling festinating gait, mask-like face, micrographia, stooped posture.
- Levodopa-carbidopa is the cornerstone: Levodopa → dopamine in brain; carbidopa blocks peripheral conversion.
- Dosing strategy: Give on a consistent schedule; HIGH-PROTEIN MEALS INTERFERE with absorption.
- Side effects of levodopa: Dyskinesias, orthostatic hypotension, on-off phenomenon (sudden loss of effect), wearing-off (shorter duration).
- Dopamine agonists (pramipexole, ropinirole): Used alone early or with levodopa to reduce dyskinesias.
- MAO-B inhibitors (selegiline, rasagiline): Slow dopamine breakdown; used early monotherapy or adjunct.
- COMT inhibitors (entacapone): Inhibit catecholamine metabolism; extend levodopa duration.
- Anticholinergics (benztropine, trihexyphenidyl): Useful for tremor early; avoided in elderly due to cognitive side effects.
- Nursing care priorities: Fall prevention (supervised ambulation, environmental safety), exercise/PT (slow progression), small frequent nutrient-dense meals, swallowing precautions, allow extra time for activities.
- Deep brain stimulation (DBS) is surgical option for advanced disease with motor complications.
- TEACHING: Do NOT skip doses; take meals 1–2 hours before/after levodopa; expect gradual decline over years; safety measures for falls and orthostasis.
Key definitions
Parkinson's Disease
Example
Patient with resting tremor, muscle rigidity, and slow movements (bradykinesia).
Progressive degenerative disorder caused by loss of dopamine-producing neurons in substantia nigra.
Tremor (Pill-Rolling)
Example
Tremor improves with movement and sleep; worsens at rest.
Resting tremor of 4–6 Hz; looks like rolling a pill between fingers.
Rigidity (Cogwheel)
Example
Passive range of motion has a 'stop-and-go' quality rather than smooth resistance.
Increased muscle tone throughout movement; feels like a ratchet or cogwheel.
Bradykinesia
Example
Patient takes longer to dress, write (micrographia), or walk.
Slowness of movement; difficulty initiating and maintaining movement.
Postural Instability
Example
Patient has difficulty maintaining balance or recovering when pushed.
Loss of righting reflexes; increased fall risk.
Diagrams to know
- Dopamine-acetylcholine balance in Parkinson's: Loss of dopamine → relative excess acetylcholine → symptoms
- Levodopa mechanism: Levodopa (crosses BBB) → Dopamine + Carbidopa (blocks peripheral conversion)
MULTIPLE SCLEROSIS (MS)
Important facts
- Typical presentation: Young to middle-aged adults, more often women.
- MOST COMMON and DISABLING symptom: FATIGUE (not weakness).
- Other manifestations: Optic neuritis (blurred vision, color blindness), diplopia, weakness, spasticity, numbness/tingling, ataxia, bladder/bowel dysfunction, cognitive changes.
- Diagnosis: MRI (demyelinating plaques in brain/spinal cord) + CSF analysis (elevated IgG, oligoclonal bands).
- Triggers to avoid: Heat, stress, infection—all can worsen symptoms or trigger relapses.
- Acute relapse treatment: IV corticosteroids (methylprednisolone) to speed recovery.
- Disease-modifying therapies (DMTs): Interferon beta (Betaseron, Avonex), glatiramer acetate (Copaxone), newer agents (natalizumab, fingolimod)—reduce relapse frequency and slow progression.
- Nursing care: Energy conservation techniques, fall prevention, fatigue management, heat avoidance, PT/OT, psychosocial support, education on DMT adherence.
- Teach: Monitor for relapse signs (new neurologic symptoms); avoid heat exposure; maintain exercise; report medication side effects; connection with MS support groups.
Key definitions
Multiple Sclerosis
Example
Young adult with optic neuritis, weakness, and MRI showing demyelinating plaques.
Chronic autoimmune disorder with demyelination of CNS neurons (myelin destruction disrupts conduction).
Relapsing-Remitting MS (RRMS)
Example
Patient has optic neuritis episode (relapse), improves over weeks (remission), then has leg weakness months later.
Most common type; alternating periods of new symptoms (relapses) and recovery (remission).
Demyelination
Example
Patches of demyelination (plaques) visible on brain/spinal cord MRI.
Loss of myelin sheath around axons in CNS; disrupts nerve signal conduction.
Diagrams to know
- MS relapse-remission cycle: Normal → Relapse (exacerbation) → Remission → Stable → Next relapse
- Demyelination process: Normal axon → Myelin damage → Conduction slowing/blocks
AMYOTROPHIC LATERAL SCLEROSIS (ALS)
Important facts
- Key feature: Motor neurons die, causing progressive weakness, atrophy, fasciculations, spasticity, dysarthria, dysphagia.
- Sensation, cognition, eye movements are PRESERVED—patient retains awareness.
- No cure; riluzole modestly slows progression (~2–3 months longer survival).
- Death usually from RESPIRATORY FAILURE as diaphragm and intercostal muscles weaken.
- Nursing care: Respiratory support planning (BiPAP, mechanical ventilation decision-making), aspiration precautions, nutrition (swallowing assessment, G-tube if needed), communication aids, advance care planning, psychosocial support.
- Teach: Realistic prognosis, advance directives, palliative care options, genetic counseling if familial ALS, support resources (ALS Association).
- Progression is relentless; average survival 2–5 years from symptom onset; patient awareness throughout is both a burden and an opportunity for dignity-preserving care.
Key definitions
Amyotrophic Lateral Sclerosis (ALS)
Example
Patient with progressive weakness, atrophy, fasciculations, but normal sensation and eye movements.
Progressive degeneration of motor neurons (upper and lower); causes worsening weakness and atrophy; sensation and cognition preserved.
Fasciculations
Example
Fine, rapid, uncoordinated muscle twitches visible in limb or tongue.
Visible, involuntary muscle twitching under the skin from dying motor neurons.
Dysarthria
Example
Speech becomes slurred and weak as respiratory and pharyngeal muscles weaken.
Difficulty with articulation of speech.
Dysphagia
Example
Progressive difficulty swallowing food and saliva; high aspiration risk.
Difficulty swallowing.
Diagrams to know
- Motor neuron vs. preserved function: Motor (weak, atrophic) vs. Sensory (normal) vs. Cognition (normal) vs. Eye movement (normal)
MYASTHENIA GRAVIS (MG) AND MYASTHENIC VS. CHOLINERGIC CRISIS
Important facts
- Hallmark: Weakness that WORSENS with activity and IMPROVES with rest (opposite of most diseases).
- Classic symptoms: Ptosis (drooping eyelids), diplopia (double vision), weak voice, difficulty chewing/swallowing, generalized weakness.
- Respiratory muscles can be affected → respiratory failure → danger.
- Diagnosis: Serology (ACh receptor antibodies), edrophonium (Tensilon) test, electromyography (EMG).
- First-line drug: Pyridostigmine (Mestinon) (anticholinesterase); improves strength by increasing available ACh.
- Dosing critically important: Give BEFORE MEALS (to maximize chewing/swallowing); consistent timing required.
- Side effects of anticholinesterases: Muscarinic (salivation, diarrhea, cramps, miosis) and nicotinic (fasciculations, weakness).
- Immunosuppressants: Corticosteroids, azathioprine, mycophenolate for long-term control.
- Acute exacerbation treatment: Plasmapheresis or IV immunoglobulin (IVIG); remove or neutralize antibodies.
- Thymectomy: Often beneficial if positive chest imaging (thymoma) or even without (remission possible).
- ---
- MYASTHENIC CRISIS vs. CHOLINERGIC CRISIS (CRITICAL DIFFERENTIAL):
- | Feature | Myasthenic Crisis | Cholinergic Crisis |
- | --- | --- | --- |
- | Cause | TOO LITTLE medication (missed doses, infection, stress, surgery) | TOO MUCH medication (overdose, toxicity) |
- | Weakness | Worsens (under-treated) | Worsens (over-treated) |
- | SLUDGE | Absent | Present (salivation, lacrimation, urination, defecation, GI, emesis) |
- | Fasciculations | Absent | Present (visible muscle twitches) |
- | Pupils | Normal | Pinpoint (miosis) |
- | Tensilon test | IMPROVES strength → needs more drug | WORSENS strength → already has too much |
- | Management | Increase anticholinesterase; support airway | STOP anticholinesterase; give ATROPINE (antidote); support airway |
- TENSILON TEST MECHANISM: Edrophonium is a short-acting anticholinesterase. Improvement = myasthenic (needs more ACh). Worsening = cholinergic (already has excess).
- ATROPINE: Anticholinergic antidote for cholinergic crisis; blocks excess muscarinic effects.
- PRIORITY IN EITHER CRISIS: AIRWAY and VENTILATORY SUPPORT; both cause respiratory failure.
- Keep atropine and edrophonium at bedside for crisis patients with MG.
Key definitions
Myasthenia Gravis
Example
Patient with ptosis and diplopia that worsen after talking; improve after rest or anticholinesterase medication.
Autoimmune disorder; antibodies attack acetylcholine receptors at neuromuscular junction → fluctuating weakness worsening with activity, improving with rest.
Acetylcholinesterase Inhibitor (Anticholinesterase)
Example
Pyridostigmine (Mestinon) given before meals to maximize chewing and swallowing strength.
Drug that blocks acetylcholinesterase, preventing breakdown of acetylcholine → increases available ACh at NMJ.
Myasthenic Crisis
Example
Patient skips doses → weak, cannot breathe → needs mechanical ventilation.
Acute respiratory failure from TOO LITTLE anticholinesterase medication; weakness worsens.
Cholinergic Crisis
Example
Patient overdoses on pyridostigmine → excessive salivation, lacrimation, urination, defecation, GI upset, emesis, plus muscle weakness.
Acute respiratory failure from TOO MUCH anticholinesterase medication (overdose); excess ACh causes SLUDGE and weakness.
SLUDGE Syndrome
Example
Drooling, tearing, frequent urination, diarrhea, nausea/vomiting due to too much anticholinesterase.
Salivation, Lacrimation, Urination, Defecation, GI upset, Emesis—signs of excess acetylcholine (cholinergic crisis).
Diagrams to know
- Myasthenic vs. Cholinergic Crisis: Cause (too little vs. too much) → Presentation (weak without SLUDGE vs. weak with SLUDGE) → Tensilon test (improve vs. worsen) → Treatment (increase drug vs. STOP + atropine)
- Acetylcholine physiology: Normal → Reduced receptors (MG) → Weakness; Treated with anticholinesterase → More ACh available → Better strength (until too much = cholinergic crisis)
GUILLAIN-BARRÉ SYNDROME (GBS)
Important facts
- Trigger: Often follows viral or bacterial infection (URI, GI illness, Zika virus, Campylobacter jejuni).
- Onset: Usually begins 1–3 weeks after infection; rapid progression (hours to days).
- Classic progression: Ascending symmetric weakness starting in legs, moving to arms, trunk, face; diminished/absent reflexes.
- CHIEF DANGER: Ascending paralysis reaching respiratory muscles → respiratory failure → ICU/mechanical ventilation.
- PRIORITY MONITORING: Serial vital capacity (VC) measurements and respiratory assessment; never relax vigilance.
- Autonomic instability: Tachycardia, hypertension/hypotension, arrhythmias, urinary retention.
- Diagnosis: Clinical presentation + elevated CSF protein (without pleocytosis—"albuminocytologic dissociation") + NCS/EMG showing demyelination.
- Treatment: Plasmapheresis or IV immunoglobulin (IVIG); both remove/neutralize antibodies; usually given early.
- Prognosis: Most patients plateau within 2–4 weeks; then gradual recovery over weeks to months; 80% make good recovery; 20% have residual weakness.
- Nursing care PRIORITY: Respiratory support (mechanical ventilation ready), immobility prevention (DVT prophylaxis, skin care, PT), pain management, nutrition/swallowing, psychosocial support, monitor for autonomic changes.
- Teach: Realistic recovery timeline; reassure that sensation is intact (patient feels everything but cannot move); need for family involvement; support during recovery.
Key definitions
Guillain-Barré Syndrome
Example
Patient develops leg weakness that spreads to arms and trunk over days; diminished reflexes.
Acute autoimmune disorder; myelin of peripheral nerves attacked → ascending symmetric weakness and paralysis beginning in legs, moving upward.
Ascending Paralysis
Example
Leg paralysis → trunk weakness → arm paralysis → facial weakness → respiratory muscle paralysis.
Weakness/paralysis that begins distally (legs) and progresses proximally (toward head and respiratory muscles).
Areflexia
Example
Absent patellar, achilles, and other reflexes in GBS.
Loss of deep tendon reflexes due to peripheral nerve damage.
Diagrams to know
- GBS progression: Lower limbs → Upper limbs → Trunk → Respiratory muscles (ascending order)
- GBS timeline: Infection → 1–3 weeks → Ascending weakness (rapid) → Plateau (2–4 weeks) → Gradual recovery (weeks to months)
ALZHEIMER'S DISEASE AND DEMENTIA
Important facts
- DEMENTIA vs. DELIRIUM (critical distinction for exams):
- • Dementia: Slow onset (months/years), progressive, irreversible, stable/consistent, alert, sleep-wake intact, caused by neurodegeneration.
- • Delirium: Acute onset (hours/days), fluctuating (worsens and improves), REVERSIBLE if cause treated, disoriented, sleep-wake disrupted, caused by infection/drugs/hypoxia/etc.
- Alzheimer's pathology: Beta-amyloid plaques + neurofibrillary tangles → neuronal death → progressive cognitive decline.
- Stages: Early (forgetfulness, mild confusion) → Middle (confusion worsens, wandering, behavior change) → Late (total dependence, minimal communication).
- Cholinesterase inhibitors (donepezil, rivastigmine, galantamine): Modest benefit (~6–12 months); reduce acetylcholinesterase breakdown to improve available ACh.
- Memantine (NMDA receptor antagonist): Moderate-to-severe disease; modestly improves cognition/function.
- Non-pharmacologic care is CORNERSTONE:
- • Safety: Wandering precautions (locks, alarms, ID bracelets), fall prevention.
- • Structure: Consistent routine, familiar faces, simple environment.
- • Communication: Short, simple sentences; face-to-face; validation (acknowledge feelings without correcting facts).
- • Orientation: Calendars, clocks, photos; repeated orientation; memory aids.
- • Activity: Purposeful activity, music, reminiscence therapy.
- Caregiver support: Critical for family burnout; respite care, support groups, education on progression.
- Behavioral symptoms: Agitation, aggression, sundowning (increased confusion at dusk) — manage with non-pharmacologic means first; medications as last resort.
- End-of-life planning: Advance directives, code status, palliative care discussion while patient can participate.
Key definitions
Dementia
Example
Gradual memory loss, confusion, wandering, loss of ADL independence.
Syndrome of progressive decline in memory, cognition, judgment, personality, and function; irreversible.
Alzheimer's Disease
Example
60-year-old with insidious memory loss progressing to confusion, personality change, and total dependence.
Most common cause of dementia; progressive neurodegeneration with beta-amyloid plaques and neurofibrillary tangles.
Delirium
Example
Patient suddenly confused after anesthesia, infection, or medication change; confusion improves when cause is treated.
Acute, fluctuating change in mental status with an identifiable cause; REVERSIBLE (opposite of dementia).
Cholinesterase Inhibitors
Example
Donepezil, rivastigmine, galantamine.
Drugs that increase acetylcholine levels in brain; modestly slow cognitive decline in Alzheimer's.
Diagrams to know
- Dementia vs. Delirium: Onset (slow vs. acute), Progression (progressive vs. fluctuating), Reversibility (irreversible vs. reversible), Cause (neurodegeneration vs. medical/toxic)
- Alzheimer's stages: Early (forgetfulness) → Middle (confusion, wandering, behavior change) → Late (total dependence, minimal communication)
- Nursing interventions by stage: Early (psychoeducation, memory aids) → Middle (safety, routine, validation) → Late (comfort, hygiene, dignity)
COMPLICATIONS COMMON TO ALL NEUROLOGIC DISORDERS
Important facts
- ASPIRATION RISK: ALS, MG, Parkinson's, stroke, myositis → Assess swallowing; NPO if unsafe; consider G-tube.
- RESPIRATORY FAILURE: ALS (diaphragm), GBS (ascending), severe Parkinson's, MG crisis → Monitor vital capacity, have intubation plan.
- IMMOBILITY COMPLICATIONS: DVT/PE, pressure ulcers, contractures, muscle atrophy → Prophylaxis (SCD, anticoagulation), frequent turning, ROM, mobilization.
- INFECTION RISK: Indwelling catheters, aspiration, immobility → Sterile technique, infection precautions, early ambulation.
- SEIZURES in degenerative disorders: Alzheimer's, Parkinson's, ALS can have seizures → Fall precautions, medication adherence.
- MEDICATION TOXICITY: Phenytoin gingival hyperplasia, anticholinergic effects, cholinergic toxicity → Monitoring, teaching on toxicity signs, dose timing.
- MEDICATION WITHDRAWAL: Sudden stop of seizure meds, Parkinson's meds → Status epilepticus, worsening of symptoms → NEVER stop abruptly.
- PAIN MANAGEMENT: Chronic pain in neuropathies, MS, ALS → Multimodal approach; never undertreat.
- BOWEL/BLADDER DYSFUNCTION: Many neurologic disorders → Bowel regimen, catheter care, UTI prevention.
- COGNITIVE/BEHAVIORAL ISSUES: Dementia, Parkinson's, MS → Safety, structure, behavioral strategies, medication if necessary.
Key definitions
Aspiration
Example
Patient with weakened swallowing aspirates food; develops pneumonia.
Entry of food/liquids or secretions into the airway; risk in disorders with dysphagia (ALS, MG, stroke, Parkinson's).
Status Epilepticus
Example
See Seizures section.
Continuous seizure activity ≥5 minutes or repeated seizures without recovery; medical emergency with high mortality if untreated.
Respiratory Failure
Example
ALS patient with diaphragm paralysis; GBS with ascending to respiratory muscles.
Inadequate gas exchange; requires mechanical ventilation.
Deep Vein Thrombosis (DVT) and Pulmonary Embolism (PE)
Example
GBS patient with leg paralysis develops DVT; PE can be fatal.
Clotting from immobility; risk in paralyzed/bedridden patients.
Diagrams to know
- Immobility cascade: Paralysis → Immobility → DVT/PE risk, pressure ulcers, contractures, atrophy
- Aspiration pathway: Dysphagia → Food enters airway → Aspiration pneumonia → Respiratory compromise
Must remember
SEIZURE DURING EXAM: Turn patient LATERAL (side) to prevent aspiration. DO NOT restrain, DO NOT force anything in mouth. Time the seizure. Protect from injury.
STATUS EPILEPTICUS = Seizure ≥5 minutes or repeated seizures without recovery between them = MEDICAL EMERGENCY. Immediate IV benzodiazepines (lorazepam or diazepam), then load with longer-acting drug (phenytoin, fosphenytoin, or levetiracetam).
NEVER ABRUPTLY STOP antiseizure medications (can trigger status epilepticus). Teach consistent dosing, steady blood levels, medical identification, no alcohol.
BACTERIAL MENINGITIS = Fever + Severe Headache + Nuchal Rigidity (stiff neck) + possibly Kernig's and Brudzinski's signs + petechial/purpuric rash (meningococcal). START ANTIBIOTICS IMMEDIATELY (don't wait for culture). Droplet precautions ×24 hours of effective antibiotics.
MYASTHENIC CRISIS vs. CHOLINERGIC CRISIS: Both cause respiratory failure. Myasthenic = TOO LITTLE drug (weakness worsens); Cholinergic = TOO MUCH drug (SLUDGE, fasciculations, miosis present). Tensilon test: Improves = myasthenic; Worsens = cholinergic. Antidote for cholinergic: ATROPINE. PRIORITY IN EITHER: Airway/ventilation.
PARKINSON'S = Tremor (resting, pill-rolling) + Rigidity (cogwheel) + Bradykinesia (slow movement). Levodopa-carbidopa cornerstone; take on consistent schedule; high-protein meals interfere with absorption. Gingival hyperplasia is side effect (oral hygiene). Watch for dyskinesias, orthostatic hypotension, on-off phenomenon.
GUILLAIN-BARRÉ = Acute ascending symmetric paralysis from legs upward, diminished reflexes, often follows infection. PRIORITY = Respiratory monitoring (vital capacity) — ascending can reach respiratory muscles. Treat with plasmapheresis or IVIG. Usually self-limiting; gradual recovery over weeks to months.
ALS = Motor neuron death with worsening weakness, atrophy, fasciculations, dysphagia, dysarthria, BUT sensation and cognition PRESERVED. Death from respiratory failure. Riluzole modestly slows it. Focus on swallowing precautions, respiratory support, nutrition, advance planning.
ALZHEIMER'S = Irreversible dementia (most common cause). Distinguish from delirium (acute, fluctuating, REVERSIBLE, identifiable cause). Alzheimer care: Safety (wandering, falls), routine, simple communication, validation, caregiver support. Cholinesterase inhibitors (donepezil, rivastigmine, galantamine) and memantine modestly slow decline.
MULTIPLE SCLEROSIS = CNS demyelination, usually relapsing-remitting. MOST COMMON/DISABLING symptom = FATIGUE (not weakness). Avoid heat, stress, infection triggers. Acute relapses: IV corticosteroids. Disease-modifying therapies (interferon, glatiramer, newer agents) reduce relapse frequency and slow progression.
Last minute tips
SEIZURE MANAGEMENT: "Side-protect-time" = Turn LATERAL, Protect from injury, TIME the seizure. This mantra covers the three critical actions. Never restrain or mouth-guard (old teaching is WRONG).
Context
Exam scenario: Patient seizing in hospital. What do you do first? Answer: Position lateral.
MENINGITIS = ANTIBIOTICS FIRST: If you see fever + stiff neck on exam, your first action is antibiotics STAT, not LP, not cultures, not waiting. LP can be done after antibiotics started. This is a common exam trap.
Context
Exam scenario: Patient admitted with fever, headache, stiff neck. What is the immediate intervention? Answer: Start empiric IV antibiotics (ceftriaxone, vancomycin ± ampicillin).
MYASTHENIC vs. CHOLINERGIC: If exam asks about SLUDGE, fasciculations, or miosis, it's cholinergic crisis (TOO MUCH drug). If weakness with NO SLUDGE/fasciculations, it's myasthenic (TOO LITTLE). The Tensilon test is confirmatory but clinical signs often tell you first.
Context
Exam scenario: MG patient presents with respiratory failure, drooling, diarrhea, pinpoint pupils. Is this myasthenic or cholinergic? Answer: Cholinergic (SLUDGE present = too much drug = stop it and give atropine).
PHENYTOIN IV: Remember NS ONLY (not dextrose) and ≤50 mg/min slow. One of the most commonly tested antiseizure drug details. Forgetting this = wrong answer on IV push rate or precipitate forming.
Context
Exam scenario: You're loading phenytoin IV in a seizing patient. What do you use as diluent? Answer: Normal saline only.
GBS RESPIRATORY PRIORITY: On exam, if you see ascending weakness, the question is almost always testing whether you know to monitor vital capacity and have mechanical ventilation ready. Don't focus only on plasmapheresis/IVIG; respiratory support is the priority intervention.
Context
Exam scenario: GBS patient with leg weakness. What is your immediate nursing priority? Answer: Monitor respiratory function (vital capacity); prepare for possible intubation.
Comparison tables
Seizure Types: Classification and Clinical Features
| Seizure Type | Consciousness | Duration | Phases | Postictal State | Most Common Age |
|---|---|---|---|---|---|
| Generalized Tonic-Clonic | Loss (always) | 60–90 sec typically | Aura → Tonic (stiffening) → Clonic (jerking) → Postictal | Yes (confusion, drowsiness, soreness) | Any age |
| Absence | Loss (brief staring) | 5–10 sec | Sudden staring, no motor activity | Minimal to none; patient unaware | Children (3–8 yr) |
| Focal Motor | Preserved or partial loss | Variable | Jerking in one limb or area | Mild confusion if LOC | Any age |
| Myoclonic | Preserved usually | Seconds | Sudden, brief muscle jerks | Minimal | Variable |
CNS Infections: Bacterial vs. Viral Meningitis
| Feature | Bacterial Meningitis | Viral Meningitis |
|---|---|---|
| Common Organisms | N. meningitidis, S. pneumoniae, H. influenzae, GBS | Enteroviruses, HSV-2, mumps, measles |
| Onset | Sudden (hours) | Gradual (hours to days) |
| Severity | Severe; often septic appearance; lethal if untreated | Milder; usually self-limiting |
| CSF Appearance | Cloudy/turbid | Clear |
| CSF Protein | >100 mg/dL (often 200–500) | Normal to mildly elevated (<100) |
| CSF Glucose | <40 mg/dL or ratio <0.4 | Normal (>40 mg/dL) |
| CSF WBC Predominant | Neutrophils (>80%) | Lymphocytes |
| CSF Pressure | Elevated (often >250 mm H₂O) | Normal to slightly elevated |
| Petechial/Purpuric Rash | Yes (meningococcal) | No |
| Treatment | Immediate IV antibiotics + dexamethasone (do not delay) | Supportive (no antibiotic; antivirals if HSV) |
| Droplet Precautions | Yes (24 hrs of effective antibiotics) | No (standard precautions) |
Myasthenic Crisis vs. Cholinergic Crisis (CRITICAL DIFFERENTIAL)
| Feature | Myasthenic Crisis | Cholinergic Crisis |
|---|---|---|
| ROOT CAUSE | TOO LITTLE anticholinesterase medication | TOO MUCH anticholinesterase medication (overdose) |
| Triggers | Missed doses, infection, stress, surgery, fatigue | Medication overdose, toxicity, renal failure (increased accumulation) |
| Muscle Weakness | Worsens (under-treated) | Worsens (over-treated) |
| SLUDGE Symptoms | ABSENT | PRESENT (Salivation, Lacrimation, Urination, Defecation, GI upset, Emesis) |
| Muscle Fasciculations | Absent | PRESENT (visible twitches from excess ACh) |
| Pupils | Normal | Pinpoint (miosis) from excess ACh |
| Respiratory Status | Failure from weakness (needs ventilation) | Failure from weakness + respiratory muscle fasciculations |
| Tensilon Test Result | IMPROVES strength → Needs more acetylcholine | WORSENS strength → Already has excess acetylcholine |
| TREATMENT | Increase or restart anticholinesterase (give more drug); Support airway | STOP anticholinesterase immediately; Give ATROPINE (anticholinergic antidote); Support airway |
| Priority Intervention | Airway & ventilatory support (FIRST); then increase medication | Airway & ventilatory support (FIRST); then ATROPINE for muscarinic effects |
Degenerative & Neuro Disorders: Onset, Progression, Prognosis
| Disorder | Typical Age | Onset | Progression | Key Feature | Prognosis |
|---|---|---|---|---|---|
| Parkinson's Disease | 50–60+ yr | Gradual (years) | Slowly progressive; staged over decades | Tremor, rigidity, bradykinesia | Manageable; Lifespan near-normal with treatment |
| Multiple Sclerosis | 20–40 yr (women > men) | Acute relapse (sudden) | Relapses and remissions | Demyelination; fatigue is #1 symptom | Highly variable; most remain ambulatory; average lifespan ~5 yrs less |
| ALS | 50–70 yr typically | Gradual (months) | Rapidly progressive; months to few years | Motor neuron loss; sensation/cognition normal | Poor; death in 2–5 yrs from respiratory failure; no cure |
| Myasthenia Gravis | 20–40 yr (women); 50–70 yr (men) | Acute or gradual | Fluctuating; improves/worsens daily | Weakness worse with activity, better with rest | Good with treatment; many achieve remission with thymectomy/immunotherapy |
| Guillain-Barré Syndrome | Any age (peaks 40–60) | Acute (days) after infection | Rapid ascending; plateau in 2–4 wks | Ascending paralysis; absent reflexes | Good; 80% recover well; 20% residual weakness; 5% mortality if ventilator unavailable |
| Alzheimer's Disease | 65+ yr (early-onset possible at 40s) | Insidious (months to years) | Slowly progressive; years to decade+ | Irreversible dementia; memory, cognition, personality | Poor; average 8–10 yrs from diagnosis; ultimately fatal; no cure |
Dementia vs. Delirium (MUST-KNOW FOR NLE)
| Feature | Dementia | Delirium |
|---|---|---|
| ONSET | Slow (months to years) | ACUTE (hours to days) |
| PROGRESSION | Steadily progressive | Rapidly fluctuating (worsens and improves) |
| REVERSIBILITY | IRREVERSIBLE (chronic, degenerative) | REVERSIBLE if underlying cause is identified and treated |
| Consciousness/Alertness | Alert (early); drowsy/apathetic (late) | Fluctuates: alert then confused then alert again |
| Attention | Intact early; declines with disease | Markedly impaired from onset |
| Sleep-Wake Cycle | Relatively preserved early | Severely disrupted (sundowning, insomnia) |
| Cause | Neurodegeneration (Alzheimer's, Parkinson's, etc.) | Identifiable medical cause: infection, drugs, hypoxia, metabolic, withdrawal, pain, etc. |
| Common Causes (Delirium) | N/A | CINAHAS: CNS infection, Intoxication, Nutrition, Anesthesia/Analgesia, Hypoxia, Alcohol withdrawal, Sepsis |
| TREATMENT | Supportive (cholinesterase inhibitors, behavioral); No cure | Treat underlying cause (antibiotics for infection, discontinue drug, restore oxygenation, etc.) |
Antiseizure Drugs: At-a-Glance
| Drug | Mechanism | Key Monitoring | Side Effects | Notes |
|---|---|---|---|---|
| Phenytoin (Dilantin) | Stabilizes neuronal membrane | Therapeutic level 10–20 mcg/mL; IV slowly ≤50 mg/min in NS only | Gingival hyperplasia, nystagmus, ataxia, hirsutism, rash | High drug interactions; teach oral hygiene; monitor for hypotension with IV |
| Levetiracetam (Keppra) | Modulates synaptic transmission | Renal function; behavioral changes | Irritability, agitation, behavioral, dizziness | Fewer drug interactions; no protein binding; preferred in renal failure |
| Valproic Acid (Depakote) | GABA enhancement | LFTs, platelet count, ammonia level | Hepatotoxicity, thrombocytopenia, tremor, weight gain, pancreatitis | Risk of hepatotoxicity (especially in young children); monitor CBC, LFTs |
| Carbamazepine (Tegretol) | Blocks Na+ channels | CBC (agranulocytosis risk), hyponatremia, LFTs | Diplopia, ataxia, rash (SJS risk), hyponatremia, agranulocytosis | Autoinduction (induces own metabolism); monitor Na+ and CBC closely |
| Lamotrigine (Lamictal) | Blocks Na+ and Ca++ channels | Rash (SJS risk), LFTs | Stevens-Johnson syndrome (serious rash), headache, insomnia | SJS risk: teach patient to report any rash immediately; slow titration reduces risk |
| Benzodiazepines (Lorazepam, Diazepam) | GABA enhancement | Respiratory function, oversedation | Respiratory depression, sedation, dependence, tolerance | First-line for acute seizure/status epilepticus; short-acting; watch for respiratory depression |
Diagrams
Acute Seizure Management Algorithm
Step-by-step decision tree for managing a patient having a generalized tonic-clonic seizure, emphasizing safety first, observation, and when to escalate to medication.
CNS Infections: Bacterial Meningitis Essentials
Mind map showing the classic presentation, findings, and immediate management priorities for bacterial meningitis. Emphasizes the critical 'do not delay antibiotics' principle.
Myasthenia Gravis: Myasthenic vs. Cholinergic Crisis State Transitions
State diagram illustrating the transition from stable MG to either myasthenic or cholinergic crisis, highlighting the opposite causes and treatments.
Dementia vs. Delirium: Rapid Differential Diagnosis
Rapid decision tree for distinguishing dementia from delirium based on onset speed and reversibility. Critical for correct diagnosis and management on NLE exams.
Guillain-Barré Syndrome: Clinical Timeline and Progression
Timeline showing the typical progression of Guillain-Barré syndrome from initial infection trigger through rapid ascending paralysis, plateau, and recovery phases. Emphasizes the critical monitoring window.