The complaint is not the localization. Prove objective power loss. Check the bellows. Then place the lesion before you order the MRI.
“What could you do yesterday that you cannot do today?” Walking, stairs, rising from a chair, lifting an arm, opening a jar, swallowing, or holding the head up gives the complaint anatomy.
Fatigue, malaise, and heavy legs are not automatically motor weakness. They still deserve an explanation, but not a reflex neuromuscular workup.
Do not let a localization framework slow reperfusion care. Establish last known well, check glucose, activate the stroke pathway, then refine the address in parallel.
A sensory level, saddle symptoms, or sphincter dysfunction points to cord. Distal sensory loss with reduced reflexes points toward peripheral nerve. No sensory loss favors NMJ, muscle, or anterior horn cell. It does not prove one.
Fatigable ocular, bulbar, neck, or proximal weakness with intact sensation is a neuromuscular junction pattern. Check ptosis, sustained upgaze, speech, cough, neck flexion, and single-breath count now.
Hyperreflexia, clonus, or Babinski suggests an established UMN lesion. Hyporeflexia suggests nerve or anterior horn cell. Normal reflexes with symmetric proximal weakness favors muscle or NMJ.
Get serial FVC, NIF or MIP, and MEP when neuromuscular respiratory failure is possible. Facial or bulbar weakness can make the mouth seal unreliable.
Pulse oximetry and blood gas can stay normal until late. Rising CO₂ means the warning phase is ending.
Call respiratory therapy and escalate early for bulbar dysfunction, weak cough, rapid progression, or declining serial values. Intubate the patient, not the spreadsheet.
Progressive neuromuscular disease, chronic weakness, GBS, and prolonged immobilization can produce dangerous hyperkalemia after succinylcholine.
ENLS alternative: rocuronium 1.0 to 1.4 mg/kg IV. A practical RSI dose is 1.2 mg/kg IV.
Succinylcholine may be relatively ineffective. Nondepolarizers can cause exaggerated and prolonged blockade.
ENLS suggests rocuronium 0.5 to 0.6 mg/kg IV. Expect prolonged weakness. Use quantitative monitoring and have a reversal plan when available.
Autonomic instability can produce bradycardia, tachyarrhythmia, or abrupt blood-pressure shifts. Put atropine or glycopyrrolate and a vasopressor within reach. Give fluid deliberately.
Think GBS, with or without paresthesias. It is a clinical diagnosis. LP and electrodiagnostics support it. Normal CSF protein early does not exclude it.
Think myasthenia when sensation is intact and pupils are normal. Respiratory metrics and bulbar function drive the level of care.
Think botulism. Pupillary dysfunction and dry mouth help separate it from MG. Call the health department now. Do not wait for laboratory confirmation or antitoxin testing.
Think myopathy. CK, medication and toxin review, thyroid testing, and electrolytes can be targeted to the story. A normal CK does not erase every myopathy.
ALS requires progressive motor impairment with UMN and LMN dysfunction after alternatives are excluded. Mixed findings without sensory loss deserve neurology follow-up or admission when function, swallowing, or breathing is threatened. Catch the pattern. Do not label the patient from one twitch.
Discharge only when strength and gait are normal, no bulbar or respiratory red flags exist, a dangerous central or neuromuscular process is not suspected, and the non-neurologic complaint has a safe plan.
Give explicit return precautions for new focal loss, progression, falls, dysphagia, dyspnea, weak cough, or inability to rise or walk.
Patient describes loss of function as: [FUNCTION]. Onset/trajectory: [LKW / PROGRESSION]. Objective strength: [PROXIMAL / DISTAL / SYMMETRY / MRC]. Gait: [SAFE / UNSAFE / UNABLE]. Mental status/cranial nerves: [FINDINGS]. Tone/reflexes/plantars: [FINDINGS]. Sensation: [NORMAL / DISTRIBUTION / LEVEL]. Bulbar exam/cough: [FINDINGS]. Neck flexion: [FINDING]. Single-breath count: [NUMBER]. FVC: [mL/kg]. NIF/MIP: [cm H₂O]. Serial trend: [TREND]. Working localization: [CENTRAL / ANTERIOR HORN / NERVE / NMJ / MUSCLE / NON-MOTOR]. Time-sensitive concern and action: [STROKE / CORD / GBS / MG / BOTULISM / OTHER].