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Multifocal motor neuropathy (MMN) is a progressively worsening condition where muscles in the extremities gradually weaken.The disorder, a pure motor neuropathy syndrome, is sometimes mistaken for amyotrophic lateral sclerosis (ALS) because of the similarity in the clinical picture, especially if muscle fasciculations are present.
Hypokalemic periodic paralysis is a condition that causes episodes of extreme muscle weakness typically beginning in childhood or adolescence. Most often, these episodes involve a temporary inability to move muscles in the arms and legs. Attacks cause severe weakness or paralysis that usually lasts from hours to days.
Its causes are many and can be divided into conditions that have either true or perceived muscle weakness. True muscle weakness is a primary symptom of a variety of skeletal muscle diseases, including muscular dystrophy and inflammatory myopathy. It occurs in neuromuscular junction disorders, such as myasthenia gravis. Muscle weakness can also ...
Motor neuron diseases affect both children and adults. [5] While each motor neuron disease affects patients differently, they all cause movement-related symptoms, mainly muscle weakness. [6] Most of these diseases seem to occur randomly without known causes, but some forms are inherited. [2]
Guillain–Barré syndrome is usually triggered by a recent infection (or more rarely a recent vaccination) and causes weakness and tingling in the arms and legs. [2] Researchers also looked at chronic inflammatory demyelinating polyneuropathy which is characterized by progressive weakness and sensory impairment in the arms and legs.
Postsynaptic symptoms in infants include severe muscle weakness, feeding and respiratory problems, and delays in the ability to sit, crawl, and walk. Synaptic symptoms include early childhood feeding and respiratory problems, reduced mobility, curvature of the spine, and weakness, which causes a delay in motor milestones.
Based on the physiological cause of NC, it is projected that the symptoms of NC can worsen over time, with roughly one-third of patients showing signs of improvement with time. [7] For NC patients that develop worse symptoms over time, severe consequences can occur. Over time, untreated NC and LSS can lead to chronic pain and muscle weakness. [13]
Rare hereditary defects of muscular ion channels and transporters that cause hypokalemic periodic paralysis can precipitate occasional attacks of severe hypokalemia and muscle weakness. These defects cause a heightened sensitivity to the normal changes in potassium produced by catecholamines and/or insulin and/or thyroid hormone, which lead to ...