So S Y, Yu D Y
Thorax. 1982 Jan;37(1):46-8. doi: 10.1136/thx.37.1.46.
Twenty-three patients with primary spontaneous pneumothorax and 30 patients with secondary spontaneous pneumothorax treated by intercostal catheter drainage with underwater seal were divided randomly into two groups, one receiving suction drainage (up to 20 cm H2O pressure) and the other no suction. The success rate was 57% for the former and 50% for the latter. The suction group spent an average of five days in hospital, whereas the non-suction group averaged four days. Suction drainage therefore did not have any advantage. To determine how soon the catheter could be removed without complication, patients were also divided randomly into two subgroups--one had the catheter removed, without previous clamping, as soon as the lung was expanded; the other had the catheters left in situ for a further three days. The success rate was 52% for the former, and 53% for the latter. But most of the failure in the early removal group was caused by re-collapse of the lung rather than persistent air leakage; hence removal of the catheter too early was not recommended.
23例原发性自发性气胸患者和30例继发性自发性气胸患者接受了肋间导管水下密封引流治疗，随机分为两组，一组接受负压引流（压力高达20 cm H2O），另一组不进行负压引流。前者的成功率为57%，后者为50%。负压引流组平均住院5天，而非负压引流组平均住院4天。因此，负压引流没有任何优势。为了确定导管在无并发症的情况下可以多快拔除，患者还被随机分为两个亚组——一组在肺复张后立即拔除导管，不拔管前夹闭；另一组将导管再留置3天。前者的成功率为52%，后者为53%。但早期拔除组的大多数失败是由肺复张不全而非持续漏气引起的；因此不建议过早拔除导管。
