Pneumothorax occurs after about a quarter of CT-guided lung biopsies, with 5-6% requiring a chest tube — a complication that turns a day-case procedure into an admission. Tract-sealing works, but autologous blood, fibrin glue and collagen plugs each carry cost or local reaction, which has limited uptake.
This meta-analysis pooled seven studies and 1,455 patients, 680 of whom had sterile saline instilled into the biopsy tract immediately after the procedure. Pneumothorax risk fell markedly (risk ratio 0.46, 95% CI 0.35-0.61) and the need for chest tube placement fell further (risk ratio 0.22, 95% CI 0.12-0.42).
What makes this immediately actionable is the intervention itself. Sterile saline is on every procedure trolley in every department in the world, costs effectively nothing, and adds seconds. There is no access barrier, no procurement decision and no learning curve of consequence. The evidence base mixes randomised trials with comparative cohorts, so it is not the highest tier, and technique details vary between studies. But given a plausible mechanism, a large effect, negligible cost and no realistic harm, this belongs in the discussion at your next departmental meeting rather than waiting for a definitive trial.
- Pneumothorax risk ratio 0.46; chest tube placement risk ratio 0.22
- Seven studies, 1,455 patients, 680 receiving saline
- Costs nothing and adds seconds to the procedure
- Mixed randomised and cohort evidence; technique varied between studies
The statistics, in plain English
Both intervals sit well below 1.0, and the chest tube effect is larger than the pneumothorax effect — which makes mechanistic sense, since sealing the tract should prevent the larger, ongoing leaks that need drainage more than it prevents small incidental ones. The main caution is design rather than statistics: pooling cohort studies with randomised trials risks including centres that adopted saline alongside other technique improvements, which would inflate the apparent effect.
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