Positioning the patient with the biopsied side dependent immediately after a percutaneous lung biopsy — and keeping them there for the first hour or so — reduces the rate of pneumothorax and, more importantly, the rate that needs a chest drain. The mechanism is mechanical: the dependent position raises local pleural pressure and helps the visceral and parietal surfaces appose over the puncture track while it seals.
It costs nothing and needs no equipment, which is why it is worth building into the post-procedure instruction rather than leaving to whoever is recovering the patient. Pair it with the things that already reduce risk: the shortest pleura-to-lesion path, avoiding crossing a fissure or a bulla, as few pleural passes as possible, and asking the patient to avoid coughing and talking during the passes.
Then check the delayed images, not only the immediate ones. A pneumothorax that is absent at the end of the procedure can appear on the four-hour film, and a patient discharged on the strength of the immediate scan alone is the one who returns.
- Position the biopsied side down immediately after the procedure and keep it there for about an hour.
- Plan the shortest pleura-to-lesion path and avoid crossing fissures and bullae.
- Minimise the number of pleural passes; each one adds risk.
- Tell the patient not to cough or talk while the needle crosses the pleura.
- Repeat imaging before discharge — a delayed pneumothorax is the one that catches people out.
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