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Aim of the study:   The purpose of the present study was to compare the use of a conventional underwater seal device with suction and a flutter valve drainage bag for pleural drainage after lung surgery.Patients and Methods:   Altogether 59 patients undergoing elective lung surgery except pneumonectomy between February 2001 and April 2002 were prospectively randomized to receive postoperative pleural drainage by 28F chest tube(s) attached to underwater seal device placed on negative pressure of 15 cm of water or flutter valve drainage bag. Following withdrawal of four patients from the study, 55 patients were evaluated (31 patients in the underwater seal device group and 24 patients in the flutter valve drainage bag group).Results:   In the conventional underwater seal device group the mean drainage time was 2.6 (SD ± 2.0) days and in the flutter valve drainage bag group the mean drainage time was 3.3 days (SD ± 4.0); difference −0.8, 95% confidence interval (CI) −2.4 to 0.9. The mean length of hospitalization in the surgical ward was 3.6 (SD ± 2.7) and 4.1 (SD ± 4.4) days respectively (difference −0.5, 95% CI −2.5 to 1.4).Conclusions:   The results of this study suggest that flutter valve drainage system is a safe and feasible alternative in managing postoperative air leaks and haemorrhage after lung surgery other than pneumonectomy if air leaks are not extremely massive.

Comparison between Flutter Valve Drainage Bag and Underwater Seal Device for Pleural Drainage after Lung Surgery