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spastic hemiplegia : ウィキペディア英語版
spastic hemiplegia
Spastic hemiplegia is a neuromuscular condition of spasticity that results in the muscles on one side of the body being in a constant state of contraction. It is the "one-sided version" of spastic diplegia. It falls under the mobility impairment umbrella of cerebral palsy. About 20–30% of people with cerebral palsy have spastic hemiplegia. Due to brain or nerve damage, the brain is constantly sending action potentials to the neuromuscular junctions on the affected side of the body. Similar to strokes, damage on the left side of the brain affects the right side of the body and damage on the right side of the brain affects the left side of the body.
The affected side of the body is rigid, weak and has low functional abilities. In most cases, the upper extremity is much more affected than the lower extremity. This could be due to preference of hand usage during early development. If both arms are affected, the condition is referred to as double hemiplegia. Some patients with spastic hemiplegia only suffer minor impairments, where in severe cases one side of the body could be completely paralyzed. The severity of spastic hemiplegia is dependent upon the degree of the brain or nerve damage.〔
==Causes==
There are many different brain dysfunctions that can account for the cause for spastic hemiplegia. Spastic hemiplegia occurs either at birth or in the womb. The cause can be all types of strokes, head injuries, hereditary diseases, brain injuries and infections.〔
〕 Malformations of the veins or arteries in any part of the body can lead to spastic hemiplegia. The artery most commonly affected is the middle cerebral artery. Unborn and newborn babies are susceptible to strokes.〔 Leukodystrophies are a group of hereditary diseases that are known to cause spastic hemiplegia. Brain infections that cause spastic hemiplegia are meningitis, multiple sclerosis, and encephalitis. The spasticity occurs when the afferent pathways in the brain are compromised and the communication between the brain to the motor fibers is lost. When the inhibitory signals to deactivate the stretch reflex is lost the muscle remains in a constant contracted state. With spastic hemiplegia, one upper extremity and one lower extremity is affected, so cervical, lumbar and sacral segments of the spinal column can be affected.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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