Amyotrophic Lateral Sclerosis · Lou Gehrig's disease — BOTH motor neurons die, the mind does not
NG-231NEURO · MOTOR NEURONE DISEASEADHD-friendly visual edition
ALS destroys the wiring that carries movement — the upper motor neuron from the brain to the
spinal cord AND the lower motor neuron from the cord to the muscle. Nothing else in the nervous system is
targeted, which is the cruel part: sensation, sight, hearing, bowel and bladder control and — classically —
awareness stay intact while the body stops moving. There is no cure. Death is almost always from
respiratory failure, usually within 3–5 years. Everything a nurse does here is about
breathing, swallowing, comfort and dignity.
⬆️⬇️ BOTH NEURONSUpper and lower motor neurons. Spasticity plus wasting and twitches in the same person.
🧠 MIND INTACTSensation, sight, hearing, bowel/bladder and awareness are typically preserved.
🫁 RESPIRATORY = #1Increased secretions and a weak cough are the priority findings. Respiratory failure is the cause of death.
🕊️ NO CURECare is supportive. Start advance-directive conversations early, not at the end.
🧠
TWO MOTOR NEURONS, BOTH DYING
STEP 1 · CAUSE
Every other motor-neurone disease hits one level. ALS hits both — that combination is the diagnosis.
🧠 The motor pathway and where it breaks
Movement needs a relay of two neurons. The upper motor neuron runs from the motor cortex down to the spinal cord; the lower motor neuron runs from the anterior horn out to the muscle. ALS degenerates both.
🧠 Two runners, one baton. ALS kills both runners, so the baton never reaches the muscle.
📖 The name IS the pathology
A-myo-trophic = “no muscle nourishment” → the muscle wastes (lower motor neuron)
Lateral = the lateral columns of the spinal cord, where the corticospinal tract runs
Sclerosis = hardening/scarring of those tracts (upper motor neuron)
Also called Lou Gehrig's disease, and in much of the world motor neurone disease.
🧠 ALS = Advanced Life Support. They will eventually need a ventilator to stay alive — that is the memory hook and the prognosis in one.
👥 Who gets it, and why
Most cases are sporadic — no family history, no known cause
Roughly 5–10% are familial (inherited)
Usual onset between 40 and 70; slightly more men than women
Not infectious, not caused by anything the patient did
Families ask “what did I do?” The honest answer for most people is: nothing.
🧠 No blame. Say it out loud early — families carry guilt otherwise.
⭐ Upper vs lower motor neuron signs — the two lists
UPPER motor neuron (brain → cord)
LOWER motor neuron (cord → muscle)
Spasticity — stiff, tight, hard to bend
Flaccidity — floppy, loose
Hyperreflexia — brisk, exaggerated reflexes
Hyporeflexia — reduced or absent reflexes
Clonus — rhythmic beating at the ankle
Fasciculations — visible muscle twitches
Positive Babinski — big toe goes up
Atrophy — visible muscle wasting
Weakness without much wasting
Weakness with wasting and cramps
ALS = BOTH lists in the same patient, often in the same limb
Watch the hands. Hollowing at the base of the thumb and deep valleys between the knuckles mean muscle has been lost, not just weakened — and fasciculations are dying motor units firing on their own.
🧠 Wasting + twitching = LOWER. You can see it across the room.
🦶 Upper motor neuron damage, drawn
A positive Babinski in an adult is abnormal and points upward — to the brain and corticospinal tract. Finding this in a limb that is also wasting is the hallmark of ALS.
🧠 Toe UP = trouble UP. The problem is above, in the upper motor neuron.
🔬 Why muscles shrink when a nerve dies
A muscle fiber depends on its motor neuron for survival, not just for orders. When the neuron dies the fiber shrinks into a small angular shape and fat and connective tissue fill the space — which is why the limb looks thinner even before it feels weaker.
🧠 Use it or lose it — but here they cannot use it.
🧪 How it is diagnosed
There is no single test. ALS is a clinical diagnosis of UMN + LMN signs spreading over time, with other causes ruled out.
EMG / nerve conduction studies — show widespread denervation
MRI brain and spine — to exclude cord compression, MS, tumor
Diagnosis often takes months, which is itself distressing for families.
🧠 Rule out the treatable first. That is what all the tests are for.
👀
WHAT YOU SEE — AND WHAT STAYS
STEP 2 · CLUES
Progressive, usually asymmetrical, and it spreads. What it leaves alone matters just as much.
🕊️ What ALS takes and what it leaves
Sensation and awareness are typically preserved. This is the single most important thing to tell staff, students and families — because a person who cannot move or speak is still fully present in the room.
An honest nuance: a proportion of people with ALS do develop changes in thinking or behavior, and a smaller group develop frontotemporal dementia. The classic teaching point — sensation intact, awareness intact — still stands, but do not promise a family that nothing will ever change.
🧠 The body is a prison, not the mind. Speak to them, not about them.
🦵 Limb onset (about two-thirds)
Tripping, foot drop, catching a toe on the carpet
Dropping things; trouble with buttons, keys, jar lids
Asymmetrical — one hand or one foot first
Cramps and twitching, often before obvious weakness
Then spreads to the other limbs and the trunk
🧠 One hand, one foot, then everything.
🗣️ Bulbar onset (about one-third)
Dysarthria — slurred, strained, nasal speech; often the first thing family notice
Dysphagia — coughing on drinks, food sticking, longer meals
Sialorrhoea — drooling, because they cannot swallow saliva, not because they make more
Tongue wasting and tongue fasciculations
Emotional lability (pseudobulbar affect) — sudden laughing or crying that does not match the mood
Bulbar onset carries a higher aspiration risk from the start.
🧠 Speech + swallow = bulbar. Same muscles, same nerves.
🚨 The findings that get reported
Increased respiratory secretionsPRIORITY — they cannot clear them
Weak or ineffective cough
Rhonchi on auscultation — secretions in the large airways
Fever — commonly reported above about 100.4 °F (38 °C); use the threshold the team gives
New breathlessness lying flat; morning headaches; daytime sleepiness
Rhonchi ≠ crackles. Rhonchi suggest secretions; crackles suggest fluid — a different problem.
⚖️ ALS vs the other neuro diagnoses she confuses it with
Feature
ALS
MS
Guillain-Barré
Myasthenia gravis
Where
Upper + lower motor neurons
CNS myelin
Peripheral myelin
Neuromuscular junction
Course
Steadily progressive
Relapse & remit
One episode, recovers
Fluctuates, chronic
Sensation
Normal
Often abnormal
Tingling common
Normal
Reflexes
Mixed — brisk and absent
Often brisk
Absent
Normal
Wasting
Yes, marked
Late/disuse
Disuse only
Usually none
Cure?
No
No, but treatable
Usually recovers
No, but very treatable
🧠 Only ALS gives you brisk reflexes in a wasted, twitching limb.
🚨
BREATHING IS THE PRIORITY
STEP 3 · EMERGENCY
The diaphragm is a skeletal muscle with a motor neuron. It goes the same way as the others.
🫁 How breathing fails — and what warns you
Respiratory muscle weakness builds slowly, so the first signs appear at night — the diaphragm has to work hardest lying flat.
🧠 Morning headache + daytime sleepiness = night-time CO₂ retention. Ask about it every visit.
🚨 Early warning signs of respiratory failure
Morning headaches and unrefreshing sleep (CO₂ retention overnight)
Orthopnea — cannot lie flat, sleeps on more pillows
Daytime sleepiness, poor concentration
Short, fragmented sentences; using accessory muscles
Weak cough; increasing secretions
Falling FVC on serial testing
Never wait for a low SpO₂ — oxygenation stays normal until very late in muscle-pump failure.
🧠 Headache, pillows, sleepiness. Three questions that find failing breathing before any monitor does.
✅ What actually helps the breathing
Non-invasive ventilation (BiPAP) — often at night first; relieves symptoms and improves survival and quality of life
Mechanical cough assist (insufflation-exsufflation) to clear secretions
Suction, positioning, chest physiotherapy
Treat infections early and aggressively
Vaccination (influenza, pneumococcal) per provider advice
Oxygen alone can be harmful in this setting — it may blunt the drive to breathe while CO₂ rises. Ventilation, not oxygen, is the answer. Follow the plan set by the respiratory team.
🧠 They need help MOVING air, not richer air.
💧 Secretions & drooling
Two different problems that both come from a weak swallow:
Thin saliva pooling → drooling; managed with anticholinergic medication, positioning and suction
Thick, tenacious mucus → managed with hydration, nebulized saline, cough assist and suction
Ask which one it is before reaching for a drug — drying agents make thick secretions worse.
🧠 Thin = dry it. Thick = thin it. Opposite treatments.
🚨 Aspiration & pneumonia prevention
Speech and language assessment for every patient with any swallow change
Upright at 90° for meals and for 30 minutes after
Modified textures and thickened fluids as recommended
Small bites, slow pace, no talking with food in the mouth
Meticulous oral care — reduces the bacterial load if aspiration happens
Suction available; monitor temperature and lung sounds
🧠 Pneumonia is what ends most ALS admissions. Oral care is real prevention.
🤝
SUPPORTIVE CARE IS THE TREATMENT
STEP 4 · CARE
No cure does not mean nothing to do. It means everything you do matters more.
🤝 The six supports
🧠 Breathe · clear · feed · speak · move · support. Six words, six services.
💊 Disease-modifying drugs
There is no cure. A small number of drugs modestly slow progression:
Riluzole — reduces glutamate activity; modest survival benefit. Monitor liver function and watch for dizziness, nausea and fatigue
Edaravone — an antioxidant used in some countries/settings
Availability and eligibility vary by country and by center. Do not overstate the benefit to families — these drugs buy time, they do not reverse anything.
Eating is exhausting — small frequent meals beat three big ones
Rest before eating; the arms have to work to get food to the mouth
Discuss a PEG tube early, while breathing is strong enough for the procedure to be safe
A feeding tube does not have to mean the end of eating for pleasure
🧠 Talk about the tube before you need it. Later is more dangerous, not more respectful.
🛏️ Immobility care
Repositioning schedule and a pressure-redistributing surface
Passive range of motion and splints to prevent contractures
VTE prevention
Safe transfers — hoists early protects both patient and carer
Sensation is intact: they feel every uncomfortable position, and cannot shift themselves
🧠 They feel it. That single fact should change how you move them.
🕊️
PLANNING, DIGNITY & THE FAMILY
STEP 5 · TEACH
The conversations that happen early are the ones that protect the patient later.
📝 Advance directives — start EARLY
While speech and hand function are still good, the patient can say what they want. Later, they may not be able to tell anyone.
1
Name a healthcare proxy / decision-maker and make sure the family know who it is.
▼
2
Decide about ventilation. Non-invasive first — but do they want a tracheostomy and long-term ventilation if it comes to that?
▼
3
Decide about a feeding tube, and under what circumstances.
▼
4
Write it down. Advance directive, resuscitation status, and where the documents live.
▼
5
Revisit it. People change their minds as their situation changes — and that is allowed.
Never leave these decisions until the patient is in respiratory crisis in an emergency department.
🧠 Ask while they can still answer.
🗣️ Protect communication
Voice banking — record their own voice early for a speech-generating device
Refer to speech therapy before speech becomes unintelligible
Letter boards, switches, eye-gaze technology as things progress
Allow time — do not finish their sentences unless they ask you to
Ask yes/no questions when they are exhausted
🧠 Bank the voice while there is a voice to bank.
👨👩👧 The family and carers
Carer burden here is among the highest in medicine — ask them how they are
Teach transfers, suction and equipment before discharge, and check competence
Respite care, home adaptations, financial and benefits advice
Anticipatory grief starts at diagnosis, not at death
Signpost to ALS/MND associations and local support groups
🧠 Two patients in the room.
🕊️ Palliative care is not giving up
Palliative care should be introduced at diagnosis, alongside active treatment. It is symptom control, planning and support — not a signal that treatment has stopped.
Better symptom control and fewer crisis admissions
Clear plans for breathlessness and secretions at the end of life
Support for the family before and after death
🧠 Early palliative care = better living, not shorter living.
🧠 The five things students get wrong
Trap 1Saying it is upper motor neuron only, or lower only. It is both.
Trap 2Expecting numbness. Sensation is intact.
Trap 3Talking over the patient. Awareness is intact.
Trap 4Prioritizing nutrition over the airway. Secretions and breathing come first.
Trap 5Confusing rhonchi with crackles. Rhonchi = secretions.