[Contralateral pneumothorax after lung resection].
Nine hundred and seventy-three consecutive patients were referred to our hospital for thoracotomy to treat chest diseases between January 1, 1981, and December 31, 1995. Of these patients, 20 males were readmitted within a mean of 20 months with a diagnosis of contralateral pneumothorax. Sixteen of the patients with a mean age of 28.5 years (range 16-76 years of age) had been operated on for bullous lung disease. The remaining four, with a mean age of 60.8 years (range 54-71), had been operated on for lung cancer. All of the 20 patients had received unilateral thoracotomy for lung resection. One patient had undergone pneumonectomy for lung cancer; three had undergone lobectomy; and 16 had been treated by partial lung resection. The patient who had undergone pneumonectomy was found to have contralateral pulmonary metastasis of lung cancer. In the other 19 patients, emphysematous bulla was the origin of the contralateral pneumothorax. The mean value of body mass index (BMI) of the group was 18.4 as compared to 21.7 in the patients who did not go on to develop contralateral pneumothorax, a significant difference (p < 0.05). In conclusion, postoperative contralateral pneumothorax was correlated to the existence of emphysematous changes of the lung and a significantly lower BMI. We conclude that patients with BMIs less than 20 may be at increased risk of developing postoperative contralateral pneumothorax.