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.
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机译：将经水下密封的肋间导管引流治疗的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随机分为两组，一组接受抽吸引流（最高20 cm H2O压力），另一组则不抽吸。前者的成功率为57％，后者的成功率为50％。吸痰组平均在医院呆了五天，而非吸痰组平均在医院呆了四天。因此，抽吸引流没有任何优势。为了确定多长时间后才能将导管移除而不引起并发症，患者也被随机分为两个亚组：一个是在扩大了肺部的情况下，在没有事先夹紧的情况下将导管移除了。另一个将导管原位放置三天。前者的成功率为52％，后者的成功率为53％。但是，早期切除组的大多数失败是由于肺塌陷而不是持续的漏气引起的。因此不建议过早拔除导管。
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