Hand muscle atrophy

Introduction Muscle atrophy is a type of muscle atrophy. Muscle atrophy refers to the reduction of muscle volume caused by dystrophic dystrophy, muscle fiber thinning or even disappearance. Often a small hand or a small muscle atrophy, weakness, gradually involving the forearm, upper arm and shoulder strap muscles, but also from the lower limbs atrophy, but rare, distal atrophy, muscle tension and tendon reflex reduction, no sensory dysfunction, sphincter function Involved, involving the medulla oblongata survival period, often died of lung infection

Cause

Cause:

1. Some nerves such as the hands or wrists are damaged.

Second, the hand and wrist due to fracture or ligament injury caused by long-term plaster or clip fixation, resulting in limited activity. There is also a part of the limbs with limited mobility after hemiplegic, anterior horn lesions, nerve roots, nerve plexus, peripheral nerve lesions, immune dysfunction, genetic factors, heavy metal poisoning, nutritional metabolic disorders and environmental factors can cause The nerve excites the impulsive conduction disorder, thereby dissipating part of the muscle fiber.

an examination

Related inspection

Electromyography, parathyroid hormone, grip body mass index, parathyroid hormone (PTH)

Diagnosis: EMG is a typical neurogenic change. At rest, the fibrillation potential and positive sharpness can be seen, and sometimes the tremor potential can be seen. When the small force contracts, the motor unit potential time is widened, the amplitude is increased, and the multiphase wave is increased. The vigorous contraction presents a simple phase. Nerve conduction. Motor evoked potentials help to determine upper motor neuron damage.

1. Mild atrophy: The muscle fiber is slightly decreased, the appearance of muscle tissue is not obviously depressed, the muscle tissue is loosened, the muscle is weak, and resistance exercise can be performed.

2. Moderate muscle atrophy: partial atrophy and loss of muscle fibers, faint appearance of muscle tissue, narrowing of the longitudinal direction of the touch, lateral reduction, obvious muscle weakness, and resistance to movement.

3. Severe muscle atrophy: Most of the muscle fiber tissue shrinks and the associated bones are exposed. There is only a small amount of muscle fiber in the muscle tissue, the muscle weakness is severe, and the patient loses the most basic coordination exercise ability.

4. Complete atrophy: The muscle fiber tissue is completely atrophied and the motor function associated with its muscle is completely lost.

Differential diagnosis

Differential diagnosis of hand muscle atrophy:

1, neurogenic muscle atrophy: mainly caused by spinal cord and lower motor neuron lesions. Found in vertebrae bone hyperplasia, intervertebral disc disease, spinal nerve tumor, arachnoiditis, neuritis, plexus lesion, spinal nerve tumor, arachnoiditis, neuritis, plexus lesion, nerve injury, syringomyelia, motor neuron disease , Guillain-Barré syndrome, brain lesions and disuse muscle atrophy caused by spinal cord disease.

2, myogenic muscle atrophy: common in muscular dystrophy, dystrophy myotonia, periodic paralysis, polymyositis, trauma such as crush syndrome, ischemic myopathy, metabolic myopathy, endocrine Myopathy, drug-induced myopathy, neuromuscular transmission disorders such as myasthenia gravis.

3, disuse muscle atrophy: upper motor neuron lesions caused by long-term muscle movement, systemic wasting diseases such as hyperthyroidism, malignant tumors, autoimmune diseases.

4, other causes of muscular atrophy: such as cachexia muscle atrophy, sympathetic muscular dystrophy.

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