Acute benign myositis in children

Introduction to acute benign myositis in children Acute benign myositis in children is a myositis that occurs in children during the flu. It is also called acute transient myositis, viral myositis, and influenza myositis in children. It is more common in winter and spring. The children are usually in good health. They have fever, runny nose, nasal congestion, paroxysmal cough and other symptoms of upper respiratory tract infection. The course of disease is 3d to 7d, or there is diarrhea. The child suddenly wakes up at night and has double calf muscles. Pain, myalgia is mainly calf muscle, bilateral more than unilateral, thigh muscle second, even can affect the neck, scapula and upper limbs, myalgia is mostly dull pain, often appear after exercise, can be relieved after rest Difficult to walk or refuse to walk, check the tenderness of the calf muscles, but no skin sensation abnormalities, no redness and swelling of the appearance, negative pathological signs of the nervous system, muscle pain recovered quickly after treatment, quickly disappeared, the symptoms of the group were relieved The time is 2 to 4 days. basic knowledge The proportion of illness: 0.005% Susceptible people: more common in children Mode of infection: non-infectious Complications: influenza

Causes of acute benign myositis in children

Virus infection (85%):

Acute benign myositis in children was first discovered by Lundbeng (reported in 1957) in Swiss children. The disease may be a viral infection, such as Coxsackie virus, influenza A or B virus and parainfluenza virus 1,3 Types, etc., especially related to influenza B virus infection, have been reported in recent years with EB virus, HIV virus, etc. Foreign literature reports that BACM A, B influenza virus infection rates were 5.5% and 33.9, respectively.

Low immunity (15%):

Because of the development of the body, the immune development of children is not perfect, so it is a susceptible population in a susceptible environment. Some patients with immune system diseases are also susceptible populations.

Prevention of acute benign myositis in children

Parents should strengthen their attention to children and be alert when there are symptoms such as fever, cough, runny, sore throat or diarrhea. Seek medical attention promptly.

Complications of acute benign myositis in children Complications, influenza

Acute benign myositis in children is a complication of influenza, and its own complications are relatively rare. There is no relevant record yet.

Acute benign myositis in children Common symptoms Dull pain, muscle pain, diarrhea, nasal congestion, fever

Symptom performance

The children are usually in good health. They have fever, runny nose, nasal congestion, paroxysmal cough and other symptoms of upper respiratory tract infection. The course of disease is 3 to 7 days, or there is diarrhea. The child suddenly wakes up at night and suddenly appears double. Calf muscle pain, muscle pain is mainly calf muscle, bilateral more than one side, thigh muscles second, even can affect the neck, scapula and upper limbs, muscle pain is mostly dull pain, often appear after exercise, after rest Can be relieved, walking difficult or refuse to walk, check the tenderness of the calf muscles, but no skin abnormalities, no redness and appearance, negative pathological signs of the nervous system, muscle pain recovered quickly after treatment, quickly disappeared, the group Symptom relief time is 2 to 4 days.

Laboratory inspection

The peripheral white blood cells were in the normal range, and the peripheral blood was mainly elevated by lymphocytes. The serum phosphocreatine kinase (CPK) was high, ranging from 394 u/L to 2 759 u/L, lactate dehydrogenase (LDH). Creatine kinase isoenzyme (LK? MB) and -hydroxybutyrate dehydrogenase (HBDH) also slightly increased, but increased with CK.

Examination of acute benign myositis in children

The peripheral white blood cells were in the normal range, and the peripheral blood was mainly elevated by lymphocytes. The serum phosphocreatine kinase (CPK) was high, ranging from 394 u/L to 2 759 u/L, lactate dehydrogenase (LDH). Creatine kinase isoenzyme (LK? MB) and -hydroxybutyrate dehydrogenase (HBDH) also slightly increased, but increased with CK.

Diagnosis and differentiation of acute benign myositis in children

Acute benign myositis in children needs to be differentiated from the following diseases: myalgia seen during the flu: myalgia is painful at the beginning of the flu, fatigue and pain are widespread, the site is not fixed, CK is not significantly elevated; epidemic myalgia: by Coxsackie virus, caused by Echovirus, is characterized by sudden and severe episodes of pain on the sides of the chest or the attachment of the diaphragm after the symptoms of prodromal headache. The pain can be exacerbated by deep inspiratory or postural changes. Polymyositis or dermatomyositis: slow progression, the lesion mainly affects the proximal muscles of the limbs, often complicated by skin damage, no severe myalgia and tenderness; acute myoglobinuria: multiple acute onset, occurred in The high fever period of viral infection, manifested as severe myalgia and muscle spasm, muscle swelling, tenderness, urine is soy sauce color, urine occult blood test is negative, urinary myoglobin, severe lead to acute renal failure, muscle biopsy visible Muscle fiber necrosis, sometimes accompanied by phagocytosis, generally no obvious inflammatory cell infiltration, poor prognosis.

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