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Hypotonia is a state of low muscle tone [1] (the amount of tension or resistance to stretch in a muscle), often involving reduced muscle strength. Hypotonia is not a specific medical disorder, but a potential manifestation of many different diseases and disorders that affect motor nerve control by the brain or muscle strength.
Affected are preschool and school-age children with a male predominance. [2] In one study, the median age was 6 years (range 2–13.2 years). [ 1 ] It has been estimated that BACM has an incidence of 2.69 cases per 100,000 children (<18 years) during epidemic seasons and 0.23 cases during non-epidemic seasons.
CMD with brain-eye, also called muscle-eye-brain disease, [19] is a rare form of congenital muscular dystrophy (autosomal recessive disorder) causing a lack of normal muscle tone which can delay walking due to being weak, also paralysis of eye muscles and intellectual disability which affects an individual's way of processing information. [19]
The muscle weakness that worsens with activity (abnormal muscle fatigue) in myasthenia gravis [66] is a symptom shared by other neuromuscular diseases. Most of the metabolic myopathies, such as McArdle disease (GSD-V), have abnormal muscle fatigue rather than fixed muscle weakness.
Signs and symptoms vary among people and over time, [1] [3] but include poor coordination, stiff muscles, weak muscles, and tremors. [1] There may be problems with sensation, vision, hearing, and speech. [1] Often, babies with cerebral palsy do not roll over, sit, crawl or walk as early as other children. [1]
The symptoms vary depending on the SMA type, the stage of the disease as well as individual factors. Signs and symptoms below are most common in the severe SMA type 0/I: [19] [medical citation needed] Areflexia, particularly in extremities; Overall muscle weakness, poor muscle tone, limpness or a tendency to flop
Muscle weakness can also be classified as either "proximal" or "distal" based on the location of the muscles that it affects. Proximal muscle weakness affects muscles closest to the body's midline, while distal muscle weakness affects muscles further out on the limbs. Proximal muscle weakness can be seen in Cushing's syndrome [18] and ...
It is characterized by generalized muscle weakness and low muscle tone. In its severest form, affected babies often die from respiratory failure. [6] To date, 9 gene mutations have been found to cause nemaline myopathy. 6 of the identified genes are associated with the actin filament, which is the basis for muscle contraction.