Needle Aspiration of Pneumothorax

Indications

Symptomatic primary spontaneous pneumothorax where the patient and clinician, following shared decision-making, choose an active intervention over conservative management or an ambulatory device — needle aspiration is one of several options in the BTS 2023 pathway, not the default for every pneumothorax.
Not first-line for secondary pneumothorax or large/tension pneumothorax — these usually need tube drainage or immediate decompression.

The BTS 2023 pleural guideline reframes management as symptom-driven rather than purely size-driven: options include conservative management, ambulatory device, needle aspiration, or chest drain, chosen collaboratively with the patient based on symptoms, safety and preference.

Contraindications & cautions

Relative contraindications

Tension pneumothorax — needs immediate decompression, not elective aspiration technique.
Secondary pneumothorax with significant underlying lung disease — lower threshold for drain over aspiration.
Coagulopathy — correct if time and clinical urgency allow.

Cautions

Bilateral or haemodynamically significant pneumothorax — treat as an emergency, not a routine aspiration.
Loculated pneumothorax — aspiration less likely to succeed; consider imaging-guided approach.

Consent & preparation

Discuss the alternatives — conservative management, ambulatory device, aspiration, or drain — as a shared decision, not a default pathway.
Consent covering pain, failure to resolve, recurrence, bleeding, infection, and rare organ injury.
Confirm side against current imaging; mark the site.
IV access and monitoring for a symptomatic patient; analgesia as needed.
Full aseptic technique — sterile gloves, skin prep, drape.

Equipment

16–18G cannula (over-the-needle)

Three-way tap

50 mL syringe

Lidocaine 1% for local anaesthesia

Sterile gloves, drape, skin prep

Container/bowl for aspirated air (via tap outlet)

Dressing for the site afterwards

Post-procedure chest X-ray access

Site

Standard site is the 2nd intercostal space in the midclavicular line, or within the safe triangle in the mid-axillary region — always just above the rib to avoid the neurovascular bundle.

Step-by-step technique

Confirm and mark
Confirm side and site against imaging; consider bedside ultrasound to confirm the target space is free of underlying lung/solid organ.
Anaesthetise
Infiltrate skin, subcutaneous tissue and down to the pleura with lidocaine, aspirating as you go to confirm you have reached the pleural space (air return).
LAST rescue — AAGBI algorithm ↗
Insert the cannula
Advance the 16–18G cannula just above the rib, attached to a syringe, aspirating continuously until air is obtained; advance the plastic cannula off the needle and remove the needle, leaving only the cannula in the pleural space.
Attach the three-way tap and aspirate
Connect the three-way tap and 50 mL syringe; aspirate air in aliquots, venting through the tap, up to a limit of 2.5 litres.
Stop early if needed
Stop aspiration if the patient develops significant coughing, resistance to further aspiration is felt (suggesting the lung has re-expanded or the pneumothorax is loculated), or the volume limit is reached.
Remove and dress
Withdraw the cannula, apply a dressing, and reassess the patient clinically.

Stop aspirating once 2.5 litres has been removed — beyond this, chest drain insertion is the next step rather than continued aspiration.

Complications

Early

Pain at the insertion site.
Failure to resolve the pneumothorax (incomplete lung re-expansion).
Bleeding, intercostal vessel injury.
Organ puncture (rare) — lung, and depending on site, other structures.

Late

Recurrence of the pneumothorax.
Infection at the site.
Re-expansion pulmonary oedema (uncommon with aspirated volumes but recognised).

Post-procedure care

Post-procedure chest X-ray to assess residual pneumothorax size and lung re-expansion.
Observe for a period post-procedure before deciding on discharge versus admission, per the BTS pathway and local protocol.
If aspiration is unsuccessful (persistent large pneumothorax or ongoing symptoms), proceed to chest drain or ambulatory device rather than repeating aspiration indefinitely.
Safety-net advice on symptoms of recurrence and smoking cessation advice where relevant.
Document indication, consent, site, volume aspirated, and post-procedure findings.

Pitfalls & pearls

Aspiration is not the automatic first step for every pneumothorax — start with a shared discussion of all the BTS 2023 pathway options.
Stop early on resistance or cough rather than pushing to the volume limit regardless of the patient's response.
A pneumothorax that reaccumulates after aspiration usually needs a drain, not a repeat aspiration.
Always obtain a post-procedure film before making a disposition decision.

DOPS pointers

RCEM curriculum: Core Procedural Skill. What assessors look for at each entrustment level:

1	Observed only — can describe indications, the BTS pathway options, and site.
2a	Performs with supervisor present: correct site, anaesthesia, aspiration technique.
2b	Performs the whole sequence including stopping criteria, documentation and post-procedure imaging.
3	Indirect supervision: manages failed aspiration appropriately, discusses options with the patient.
4	Independent; can teach and supervise others.

References

Roberts ME, et al. British Thoracic Society Guideline for pleural disease. Thorax 2023;78(Suppl 3):s1–s42.
Asciak R, et al. British Thoracic Society Clinical Statement on pleural procedures. Thorax 2023;78(Suppl 3):s43–s68.
RCEM Curriculum 2021 — Emergency Medicine Specialty Learning Outcomes: core procedural skills (DOPS).