Preoperative and postoperative abnormalities in chest x-ray indices and in lung function in pectus deformities.

In 88 patients with pectus deformities radiologic chest indices and routine pulmonary function tests were measured before and 1 to 20 years after corrective surgery. A combination of anteroposterior indices at the upper and lower level of the chest were investigated to quantitate and to discriminate the different pectus deformities. The study comprised four groups: pectus excavatum, pectus carinatum, pectus deformatum and pectus excavatum with scoliosis. These indices were also assessed in 250 healthy males and females. Generally, several indices showed significant and discriminative changes in the different patient groups and improved again after surgery. Preoperative lung function was decreased in pectus excavatum only. In all groups lung function worsened after surgery. A stepwise discriminant analysis performed on the large group with pectus excavatum indicated that postoperative lung function was decreased if the preoperative value of FEV1 or VC was more than about 75 percent predicted and vice versa, but that it was not related to other factors such as radiologic indices, age at operation or time since operation.