- Design
- Single-centre, pragmatic, month-based cluster-randomised study
- Population
- 72 adult trauma patients with pneumothorax requiring a chest drain
- Primary outcome
- Initial chest drain duration
- Effect
- Median 41 vs 51 hours (p=0.001); total 44 vs 60 hours
SEAL IT, published 1 September in the Journal of the American College of Surgeons, was a pragmatic, single-centre study that alternated calendar months between initial suction and initial water seal for adults needing a chest drain for traumatic pneumothorax. Patients with more than 300 mL of haemothorax, or drains placed before CT, were excluded. Later management was at clinicians' discretion.
Of 3,372 trauma admissions, 72 patients were eligible. Initial water seal was associated with a shorter initial drain duration (median 41 vs 51 hours) and shorter total duration (44 vs 60 hours). Complications, secondary interventions and mortality did not differ.
Routine suction after a trauma chest drain is habit more than evidence. This study suggests that for a simple pneumothorax without a significant haemothorax, water seal from the start gets the drain out sooner. It is small and single-centre, so it supports changing the default for selected patients, with suction added if the lung does not re-expand.
- For simple traumatic pneumothorax without significant haemothorax, consider starting the drain on water seal.
- Add suction if the lung fails to re-expand or an air leak persists on the check film.
- Exclude patients with more than 300 mL of blood, as the study did.
- Expect earlier drain removal — about 10 hours sooner in this study.
Why it matters
Challenges a routine step that lengthens drain time without proven benefit.
Don't overread it
One centre, 72 patients and month-based rather than individual randomisation; it needs multicentre confirmation.
The statistics, in plain English
The difference in median drain time was about 10 hours. With 72 patients, the study could detect that but was too small to rule out an uncommon increase in complications.
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