To investigate the influence of pulmonary emphysema and small airways abnormalities on ventilation-perfusion (VA/Q) mismatching in mild chronic obstructive pulmonary disease (COPD), we studied 23 patients (mean predicted FEV1, 76 +/- 15%) before lung resection because of a localized neoplasm. Respiratory gas exchange and VA/Q distributions were measured while the patients breathed room air and 100% O2. Breathing room air, the AaPO2 was moderately increased (25 +/- 12 mm Hg) as was VA/Q mismatching, indicated by the dispersion (log SD) of both blood flow (Q) and ventilation (V) distributions (log SD Q, 0.78 +/- 0.3; and log SD V, 0.66 +/- 0.28, respectively) (normal range, 0.3-0.6). AaPO2, log SD Q, and log SD V all significantly correlated with the emphysema severity assessed morphologically from the resected lung specimens (r = 0.57, r = 0.62, and r = 0.45, respectively). Log SD V also significantly correlated with the severity of the inflammatory infiltrate of membranous bronchioles (r = 0.62). During 100% O2 breathing there was an increase in VA/Q mismatching (log SD Q rose to 1.12 +/- 0.08, p less than 0.001), suggesting release of hypoxic pulmonary vasoconstriction. This increase in VA/Q inequality was not significantly related to the severity of lung pathologic findings. We conclude that, in mild COPD, both pulmonary emphysema and small airways abnormalities contribute to VA/Q mismatch, the severity of emphysema being the major morphologic correlate of the increase in AaPO2.

A total of 127 patients (57 given placebo and 70 given a single preoperative dose of 1 g cefazolin) undergoing thoracic surgery were included in a randomized double-blind trial. The two groups were similar in regard to mean age, sex ratio, in-hospital stay before surgery, underlying disease, risk factors, type of surgery, mean duration of surgical procedure, and mean duration of chest tube drainage. The relative risk of wound infection of the patients from the placebo group was 3.27 (range 1.5-11.5; 95% confidence interval). Cefazolin significantly reduced (p less than 0.01) the wound infection rate--1 case (1.5%) in the cefazolin group versus 8 cases (14%) in the placebo group--but not the incidence of postoperative pleural empyema--5 (7%) versus 8 cases (14%)--or nosocomial pneumonia--3 (4%) versus 5 cases (9%). Cultures were made from 3 out of 9 wound infections and Staphylococcus aureus or S. epidermidis was isolated in all 3. In addition, cultures were made from 6 out of 13 pleural cavity infections and S. aureus (1 case) or other microorganisms (5 cases) were isolated in all 6. Mortality was similar in both groups and all deaths unrelated to the infections. No adverse side effects of the drug were encountered. In conclusion, a single preoperative dose of 1 g cefazolin proved to be effective for reducing the wound infection rate in non-cardiac thoracic surgery.

The prevalence of spontaneous pneumothorax was studied in 82 patients with cryptogenic fibrosing alveolitis. In 46 patients the disease affected only the lung (‘lone’ fibrosing alveolitis); in the remaining 36 patients the interstitial lung disease was associated with several systemic diseases (‘associated’ fibrosing alveolitis). 3 patients with the ‘lone’ form had a spontaneous pneumothorax. This figure represents a prevalence of 3.6%. We did not observe this complication in any patient with the associated form. Suction drainage was ineffective in the 3 patients. One of them died as a consequence of pleural infection. In the other 2 subjects thoracotomy, resection of blebs and pleurectomy were required.

No abstract

We report the results of our experience using video-assisted thoracoscopic surgery (VATS) to treat primary spontaneous pneumothorax (PSP) from January 1992 until December 1994 in a multicentered co-operative study.A total of 132 patients (110 males and 22 females, aged 13-38 yrs, mean age 26 yrs) were treated by VATS to deal with the PSP that they presented with. A standard VATS technique was used. Apical bullae were always removed, and mechanical pleural abrasion was performed, leaving a pleural drainage tube.In two cases (1.5%), a switch to thoracotomy was necessary. In eight cases (6%), air leakage persisted for 5 days after surgery, which resolved with pleural drainage. There were eight postoperative relapses (6%), which were treated with pleural drainage (n=4), VATS (n=3) or axillar thoracotomy (n=1). The average postoperative stay was 5.6 days (range 2-15 days).We conclude that video-assisted thoracoscopic surgery is a viable alternative for the treatment of primary spontaneous pneumothorax. There is, however, a high relapse rate, and in a number of cases air leakage persists in the postoperative period. Eur Respir J 1997; 10: 409-411 Primary spontaneous pneumothorax (PSP) is a benign process, but persistent air leaks or recurrence make surgical intervention necessary in 30-40% of cases. PSP has come to be treated in the classic form, through axillar thoracotomy; the results published have been good, with a minimum rate of relapse and morbidity [1][2][3][4]. Recent developments in video-assisted thoracoscopic surgery (VATS) allowed a change in surgical technique, reducing surgical intervention. In order to evaluate VATS technique in PSP we initiated a multicentered study covering a period of 3 yrs. Materials and methodsBetween January 1992 and December 1994, a co-operative multicentered study was carried out by the Thoracic Surgery departments of three teaching hospitals. A total of 132 patients affected with PSP were treated by VATS. The indications for surgery for PSP were as follows: 1) persistent air leakage of more than 7 days after pleural drainage at the first episode of PSP (n=24); and 2) ipsilateral relapse in a case of PSP previously treated by pleural drainage (n=108). Cases of spontaneous pneumothorax, in which the patient had no primary pulmonary disease, were considered to have PSP.Patients treated through axillar thoracotomy during this same period of time were excluded from the study, as were patients with secondary pneumothorax, those more than 40 yrs of age (although not suspected of having basic pulmonary disease), and those of traumatic origin.The technique used was the same in all cases. It was carried out using general anaesthesia with a doublelumen endobronchial tube. Three incisions were made in order to introduce the optical equipment, the thoracic endoscopy instruments, and the endosutures. A removal of (generally apical) bullae or dystrophic complexes responsible for the episodes of pneumothorax was always performed. In cases of air leakage, air leak tests were performe...