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The syndrome typically presents as a progressive flaccid symmetric paralysis with areflexia, often causing respiratory failure. Electromyographic studies and nerve conduction studies show normal motor conduction velocity and latency with decreased amplitude of compound muscle action potentials .
Guillain–Barré syndrome (also called "GBS") is a rapid-onset muscle weakness caused by the immune system damaging the peripheral nervous system. [3] Typically, both sides of the body are involved, and the initial symptoms are changes in sensation or pain often in the back along with muscle weakness, beginning in the feet and hands, often spreading to the arms and upper body. [3]
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.
ALS can strike at any age, but its likelihood increases with age. [64] Most people who develop ALS are between the ages of 40 and 70, with an average age of 55 at the time of diagnosis. [65] ALS is 20% more common in men than women, [65] but this difference in sex distribution is no longer present in patients with onset after age 70. [64]
The most common cause is acute inflammatory demyelinating polyneuropathy AIDP, the most common form of Guillain–Barré syndrome [13] (although other causes include chronic inflammatory demyelinating polyneuropathy) [14] Neuronopathy is the result of issues in the peripheral nervous system (PNS) neurons.
There is always a noticeable difference in the compound muscle action potential's dispersion, and conduction block is commonly experienced. [ 26 ] An MRI can show proximal nerve or root enlargement and gadolinium enhancement, which indicate active inflammation as well as demyelination in the brachial plexus [ 27 ] or cauda equina .
Disuse atrophy of the muscle occurs i.e., shrinkage of muscle fibre finally replaced by fibrous tissue (fibrous muscle) Other causes include Guillain–Barré syndrome, West Nile fever, C. botulism, polio, and cauda equina syndrome; another common cause of lower motor neuron degeneration is amyotrophic lateral sclerosis.
There is certainly overlap between Guillain–Barré syndrome, Miller Fisher syndrome and Bickerstaff brainstem encephalitis, as well as other conditions associated with anti-ganglioside antibodies such as chronic ophthalmoplegia with anti-GQ1b antibody and the pharyngo-cervico-brachial variant of GBS. [6]