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The myopathic EMG demonstrates fibrillation potentials. The serum CK level will be normal or low normal. The muscle biopsy will demonstrate the nemaline rods, but as they are less than 1 μm in length they are easily overlooked. The sections must be trichromatically stained and sectioned at a thickness of 2 to 4 μm for effective visualization.
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.
Various patterns of muscle weakness occur in different motor neuron diseases. [6] Weakness can be symmetric or asymmetric, and it can occur in body parts that are distal, proximal, or both. According to Statland et al., there are three main weakness patterns that are seen in motor neuron diseases, which are: [6] [9]
Motor neuron diseases develop when the nerve cells that control voluntary muscle movement degenerate and die, causing weakness in the muscles they control. PLS only affects upper motor neurons. [1] There is no evidence of the degeneration of spinal motor neurons or muscle wasting that occurs in amyotrophic lateral sclerosis (ALS).
Brody disease (a disease of ion pump transport) has symptoms similar to myotonia congenita, however, the delayed muscle relaxation is pseudo-myotonia as the EMG is normal. [5] Other diseases that exhibit pseudo-myotonia are myositis , glycogen storage diseases , hyperkalemic periodic paralysis , root disease, anterior horn cell disorders ...
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 ...
Brody disease (also known as Brody myopathy) includes symptoms similar to myotonia congenita, including muscle stiffness and cramping after initiating exercise (delayed muscle relaxation). However, it is pseudo- myotonia as those with Brody disease have normal EMG .
The main symptom of benign fasciculation syndrome is focal or widespread involuntary muscle activity (fasciculation). [1] The benign twitches usually have a constant location. [2] Other common symptoms are generalized fatigue or weakness, paraesthesia or numbness, and muscle cramping or spasms. [1]