Radiographic changes in the diaphragm after repair of congenital diaphragmatic hernia.

Background/purpose: The growth and function of the repaired diaphragm have not been well elucidated, which may contribute to pulmonary function and chest wall deformity. We measured the lower lung diameter at the top of the diaphragm (LLD), diaphragmatic diameter (DD), and diaphragmatic height (DH) on the posteroanterior plain chest radiograph using a picture archive and communication system.

Methods: Thirty-six children aged 10.4 +/- 4.8 years with congenital diaphragmatic hernia underwent clinical evaluation, including plain chest radiograph and a lung ventilation/perfusion scan. As a control, chest radiographs of 89 children aged 9.0 +/- 5.5 years with minor surgery were analyzed.

Results: The LLD, DD, and DH in controls were significantly correlated with age; each value was then expressed as a percentage of age-based estimated values. Ipsilateral LLD and DD were significantly decreased. The perfusion of the ipsilateral lung was best correlated with ipsilateral DD. Five patients had chest wall deformity, and 7 had scoliosis (Cobb angle >10 degrees ). Patients with scoliosis had decreased ipsilateral LLD, DD, and DH. The Cobb angle was correlated with LLD and DD.

Conclusion: The growth of the repaired diaphragm may be impaired, which contributes to decreased perfusion of the ipsilateral lung and scoliosis. The LLD and DD are simple but useful parameters in the follow-up of patients with CDH.