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Muscle atrophy is the loss of skeletal muscle mass. It can be caused by immobility, aging, malnutrition, medications, or a wide range of injuries or diseases that impact the musculoskeletal or nervous system. Muscle atrophy leads to muscle weakness and causes disability.
The hallmark sign of sarcopenia is loss of lean muscle mass, or muscle atrophy. The change in body composition may be difficult to detect due to obesity , changes in fat mass, or edema . Changes in weight, limb, or waist circumference are not reliable indicators of muscle mass changes.
Muscle weakness is a lack of muscle strength. 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.
The disease is characterized by slowly progressive weakness and wasting of both proximal muscles (located on or close to the torso) and distal muscles (close to hands or feet), most apparent in the finger flexors and knee extensors. [3] IBM is often confused with an entirely different class of diseases, called hereditary inclusion body ...
Two common but distinct conditions characterized by a loss of skeletal muscle mass are sarcopenia and cachexia. [52] Sarcopenia and cachexia represent the major causes of muscle-wasting disorders. It has been known for millennia that muscle and fat wasting leads to poor outcomes, including deaths in chronic disease states.
(D) Advanced thenar muscle atrophy. [8] Signs and symptoms depend on the specific disease, but motor neuron diseases typically manifest as a group of movement-related symptoms. [6] They come on slowly, and worsen over the course of more than three months. Various patterns of muscle weakness are seen, and muscle cramps and spasms may occur.
Myopathy experienced over a long period (chronic) may result in the muscle becoming an abnormal size, such as muscle atrophy (abnormally small) or a pseudoathletic appearance (abnormally large). Capture myopathy can occur in wild or captive animals, such as deer and kangaroos , and leads to morbidity and mortality. [ 2 ]
An initial diagnosis of PMA could turn out to be slowly progressive ALS many years later, sometimes even decades after the initial diagnosis. The occurrence of upper motor neuron symptoms such as brisk reflexes, spasticity, or a Babinski sign would indicate a progression to ALS; the correct diagnosis is also occasionally made on autopsy. [4] [5]