Clinical characteristics of plastic bronchitis in children: a retrospective analysis of 43 cases

With an increase in the diagnosis of plastic bronchitis (PB) cases, to enhance paediatricians' knowledge and add to the few existing studies, we explored the clinical characteristics, diagnosis, and treatment of PB in children.

The clinicopathological data of 43 children admitted to the Xiamen Children's Hospital and the Women and Children's Hospital, affiliated to the Xiamen University from December 2016 to December 2019, were retrospectively analysed.

All the children had cough, with 41 of them having associated fever. A peak temperature > 40 ℃ was observed in 25 children. Twenty-six children had shortness of breath, 27 had reduced respiratory sounds on the affected side, and 35 had audible moist rales on the affected side. Lactate dehydrogenase in all children increased to different degrees, and 29 had elevated D-dimer and fibrinogen degradation products. Lung imaging showed pulmonary consolidation and atelectasis, mainly in the bilateral lower lung lobes, in all the children. However, 31 had pleural effusion, mainly a small parapneumonic effusion. The infections were mainly caused by adenovirus and Mycoplasma pneumoniae. The casts in all 43 children were sucked or clamped out under bronchoscopy, and 10 were found to have type I PB on pathological examination. All children were treated with anti-infective therapy in addition to bronchoscopic cast removal. Thirty-one children were treated with methylprednisolone, and 16 with gamma globulin. Except for one child who was non-adherent to treatment, all other children showed improvement, or were cured and discharged from the hospital. Follow-up lung imaging at 3 months revealed that the lungs were fully re-expanded in 40 children. At the 6-month follow-up, six children had small airway lesions, four had obliterative bronchiolitis, and one had bronchiectasis.

Paediatric PB often occurs secondary to respiratory tract infections and progresses rapidly, with hyperpyrexia, cough, and shortness of breath as the main clinical manifestations. Pulmonary consolidation, atelectasis, and pleural effusion are seen on lung imaging, and early bronchoscopy and removal of casts in the trachea and bronchi are effective treatment options.