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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.
[49] [50] This latter condition was later termed multifocal motor neuropathy [51] This distinction is important because multifocal motor neuropathy responds to intravenous immunoglobulin alone, while chronic inflammatory demyelinating polyneuropathy responds to intravenous immunoglobulin, steroids and plasma exchange. [52]
PMA is a diagnosis of exclusion, there is no specific test which can conclusively establish whether a patient has the condition. Instead, a number of other possibilities have to be ruled out, such as multifocal motor neuropathy or spinal muscular atrophy. Tests used in the diagnostic process include MRI, clinical examination, and EMG. EMG tests ...
About Multifocal Motor Neuropathy Multifocal motor neuropathy (MMN) is a rare, chronic autoimmune disease of the peripheral nervous system. The disease is characterized by slowly progressive, asymmetric muscle weakness mainly of the hands, forearms and lower legs.
Motor neurone disease – see Amyotrophic lateral sclerosis; Motor skills disorder; Moyamoya disease; Mucopolysaccharidoses; Multifocal motor neuropathy; Multi-infarct dementia; Multiple sclerosis; Multiple system atrophy; Muscular dystrophy; Myalgic encephalomyelitis; Myasthenia gravis; Myelinoclastic diffuse sclerosis; Myoclonic ...
Multifocal motor neuropathy (MMN) with conduction block is closely related to CIDP (chronic inflammatory demyelinating polyneuropathy). Anti-GM1 antibodies are positive in around 80% of cases. MMN will present with asymmetrical motor neuropathy where reflexes are usually preserved (or slightly increased), affecting upper limb more than lower limb.
Multifocal motor neuropathy (MMN) is a rare clinical case, characterized almost entirely by muscle weakness, atrophy, and fasciculations. [6] An important feature of MMN is that the strength-duration constant is significantly small, corresponding to an appreciable increase in rheobase. [6]
Additionally, BP control in those with diabetes is helpful, while intravenous immunoglobulin is used for multifocal motor neuropathy. [1] According to Lopate, et al., methylprednisolone is a viable treatment for chronic inflammatory demyelinative polyneuropathy (which can also be treated with intravenous immunoglobulin).