International Journal of Pediatrics Research

Objective To analyze the changes of heart rate in children with myocarditis in different age groups, and to evaluate the variability by 24h holter electrocardiogram. Methods Starting and ending time: 2020, ending time :2022. A total of 90 children with myocarditis who participated in the treatment in our hospital at this stage were collected as the research analysis objects, and were divided into the infant group (age <3 years old) and the preschool group (age 3-6 years old), with 45 patients in each group. A total of 82 healthy children who underwent physical examination in our hospital during the same period were selected as the control group, divided into infant control group and preschool control group, with 41 cases in each group, and the characteristics of heart rate variability were observed. Results The fastest heart rate, slowest heart rate and average heart rate in infant group were higher than those in preschool group (P<0.05). SDNN, sDANN, PNN50 and rMSSD in infant group were lower than those in preschool group (P<0.05). SDNN, sDaNN, PNN50 and rMSSD in infantile group were lower than those in control group, P<0.05; SDNN, PNN50 and rMSSD in preschool group were lower than those in preschool control group (P<0.05). Conclusion Under 24h holter ECG assessment, the heart rate variability index of children in different age groups is different due to different development conditions. The heart rate variability characteristics of 24h holter ECG can provide evidence for clinical diagnosis and is worth promoting.

24 hour dynamic electrocardiogram; Myocarditis; Heart rate