Objective To analyze the disease characteristics and emergency treatment of pediatric benign acute myositis associated with respiratory tract infections.Methods Forty pediatric cases with myalgia/claudication,and refusal to walk in the Emergency Department from May 1 in 2021 to June 1 in 2022 were retrospectively recruited.General information,clinical manifestations,blood routine,myocardial enzyme,respiratory pathogen antigen testing,treatment,and prognosis were collected for analyses.According to the peak temperature of 38.5℃ during the onset of the disease,children with≥38.5℃ were included in the moderate-to-high fever group,otherwise,they were included in the low-to-moderate fever group.Results There were 29 boys and 11 girls included in the present study,with more boys affected than girls.The age ranged from 3 to 12 years old,including 18 cases between 3-6 years old,and 22 cases between 6-12 years old.The median age was 6(5,7)years,and it was more common in preschool and school-age children.The disease occurred during winter,and all cases not only were first-time onset but also occurred after respiratory tract infection.The duration time of pain in the moderate-to-high fever group and the low-to-moderate fever group was 3(3,4.5),and 3(3,4)days,respectively,with an average time of 3.63(1-6)days.There was a significant difference in the time of temperature change and the degree of pain(P＜0.05),but no significant difference in the duration of pain between groups(P＞0.05).The myocardial enzymes were mainly elevated in children with moderate-to-high fever,while the elevation was not significant in the low-to-moderate fever group,and the difference between the two groups was not statistically significant(P＞0.05).There was a significant difference in the degree of elevation of myocardial enzymes and the duration time of pain(P＜0.05).There were 16 cases positive for influenza B virus antigen,6 cases positive for Mycoplasma pneumoniae antigen(1 case positive for both influenza B and Mycoplasma),and 18 cases negative.Influenza B was more common followed than Mycoplasma pneumoniae.There was no significant difference in the degree of myocardial enzyme elevation among children with different pathogens(P＞0.05).Symptomatic therapy was preferred,with the disease course of 3-5 days in emergency observation and outpatient treatment,showing a significant difference compared to the length of stay.The prognosis was good,without a recurrence after a follow-up of 3 months.Conclusion Children who suddenly experience lower limb pain and abnormal myocardial enzymes after respiratory tract infections,especially after influenza B infection,should be vigilant against benign acute myositis.This disease has self-limiting characteristics and a good prognosis.
childrenbenign myositisinfluenza Bphosphate kinaseemergency department
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