Abstract:Objective To investigate the efficacy of Xiaoer Feire Kechuan Granule combined with methylprednisolone sodium succinate in the treatment of severe mycoplasma pneumonia (MP) in children.Methods A total of 112 children with severe MP admitted to our hospital from June 2021 to June 2023 were prospectively selected, and were divided into the control group and the study group by the random number table method, with 56 cases in each group. The control group was treated with methylprednisolone sodium succinate, and the study group was additionally treated with Xiaoer Feire Kechuan Granule on the basis of methylprednisolone sodium succinate. The efficacy was evaluated after continuous treatment for 10 days. Symptom improvement, lung function, clinical efficacy, airway remodeling indices, inflammation-related cytokines, immune cell function and adverse drug reactions were compared between the two groups.Results The time to resolution of fever, cough and rales in the study group was shorter than that in the control group (P < 0.05). The differences of the time to peak tidal expiratory flow as a proportion of expiratory time, volume to peak expiratory flow as a proportion of exhaled volume and respiratory rate before and after treatment in the study group were higher than those in the control group (P < 0.05). The overall effective rate of the study group was higher than that of the control group (P < 0.05). The differences of the ratio of airway wall thickness to outer diameter and the percentage wall area and after treatment were higher in the study group than in the control group (P < 0.05). The differences of the levels of surfactant protein D, galectin-3 and C-C motif chemokine ligand 5 before and after treatment in the study group were higher than those in the control group (P < 0.05). The differences of ratios of Th17/Treg and CD4+/CD8+ before and after treatment in the study group were higher than those in the control group (P < 0.05). There was no significant difference in the overall incidence of adverse reactions between the two groups (P > 0.05).Conclusions Xiaoer Feire Kechuan Granule combined with methylprednisolone sodium succinate exhibits pronounced therapeutic efficacy for severe MP, which improves the lung function, inhibits airway remodeling, and regulates the secretion of inflammation-related cytokines and immune cell function safely and reliably.