Chest Drain Insertion
Chest drain insertion is a core emergency procedure for pneumothorax, haemothorax, and pleural effusion. It is inserted in the safe triangle using aseptic technique with appropriate analgesia and imaging confirmation.
Key Facts
Safe triangle: Bordered by anterior border of latissimus dorsi, lateral border of pectoralis major, line of 5th intercostal space, and apex of axilla Seldinger technique (small-bore 12-16Fr): Preferred for most pneumothoraces and simple effusions — less painful, fewer complications Blunt dissection technique (large-bore 24-32Fr): For trauma (haemothorax), empyema, or when large-bore drainage required Always insert ABOVE the rib (neurovascular bundle runs along inferior border of each rib) Never use a trocar: BTS guidelines — risk of organ injury is too high Confirm position: CXR post-insertion — ensure drain in correct position and lung re-expanded Underwater seal drain: Swinging = patent drain; bubbling = ongoing air leak. Never clamp a bubbling drain (risk of tension pneumothorax) Complications: Injury to lung, liver, spleen, heart, intercostal vessels; misplacement; infection; re-expansion pulmonary oedema
Overview
Key Facts
Chest drain insertion is one of the most important emergency procedures in medicine. It requires knowledge of indications, anatomy, technique, and management of the underwater seal drainage system. BTS guidelines provide comprehensive guidance.
Epidemiology
Chest drains are inserted approximately 50,000 times per year in the UK. Iatrogenic complications are a significant concern — the NPSA (National Patient Safety Agency) has issued alerts on the safe insertion of chest drains following avoidable deaths.
Aetiology of Need
- Pneumothorax: Spontaneous, traumatic, iatrogenic, tension
- Haemothorax: Trauma, post-surgical, malignancy
- Pleural effusion: Infection (empyema/parapneumonic), malignancy, heart failure (refractory)
- Post-surgical: Thoracic surgery, cardiac surgery
Pathophysiology
The pleural space normally contains ~5mL of fluid maintaining the coupling between visceral and parietal pleura. Accumulation of air (pneumothorax), blood (haemothorax), fluid (effusion), or pus (empyema) disrupts this coupling, impairs lung expansion, and can cause respiratory failure. A chest drain restores negative intrapleural pressure by allowing drainage of the pathological collection.
Clinical Presentation
Indications for Chest Drain
- Emergency: Tension pneumothorax (after needle decompression), traumatic haemothorax/pneumothorax, massive pleural effusion with respiratory distress
- Urgent: Large/symptomatic spontaneous pneumothorax (after failed aspiration), empyema, post-procedural pneumothorax
- Elective: Recurrent symptomatic effusion, pleurodesis
Contraindications
- Relative: Coagulopathy (correct first), bullous emphysema (high risk of lung injury), previous pleurodesis/surgery (adhesions)
- Absolute: None — in emergency, a chest drain may be life-saving regardless of coagulopathy
Red Flags
- Large volume of blood draining immediately (>1500mL) — consider thoracotomy
- Ongoing blood drainage >200mL/hr for 2-4 hours — thoracotomy
- No improvement after drain insertion — check position (CXR), ensure no kinks, assess for blocked drain
- Sudden deterioration after drain clamped — tension pneumothorax; unclamp immediately
Differential Diagnosis
| Indication | Drain Type | Size |
|---|---|---|
| Simple pneumothorax | Seldinger (small-bore) | 12-16 Fr |
| Traumatic haemothorax | Blunt dissection (large-bore) | 28-32 Fr |
| Simple effusion | Seldinger (small-bore) | 12-16 Fr |
| Empyema | Large-bore (may need small if loculated) | 24-32 Fr |
| Tension pneumothorax | Large-bore after decompression | 28-32 Fr |
Diagnosis / Investigation
Pre-Procedure
- CXR: Confirm indication; identify side; assess size of pneumothorax/effusion
- USS: Mark site for effusion drainage — BTS recommends real-time USS guidance for all pleural fluid drainage
- Coagulation screen (INR, platelets): Correct coagulopathy if possible (INR <1.5, platelets >50)
- Consent: Written informed consent (unless emergency)
Post-Procedure
- CXR: Immediately after insertion — confirm drain position and lung re-expansion
- Ongoing: CXR before and after clamping/removal
- Monitor: Drain output, respiratory status, underwater seal (swinging and bubbling)
Management
Procedure — Seldinger Technique (Small-Bore)
- Position: Sitting upright or supine (arm abducted and externally rotated)
- Site: Safe triangle — 4th-5th ICS, mid-axillary line
- Aseptic technique: Sterile drape, gown, gloves
- Local anaesthetic: Infiltrate skin, subcutaneous tissue, intercostal muscles, parietal pleura with lidocaine 1% (max 3mg/kg)
- Insert needle above superior border of rib; aspirate to confirm correct space
- Pass guidewire through needle; remove needle
- Dilate tract; pass drain over guidewire
- Connect to underwater seal; secure drain with suture and dressing
- CXR to confirm position
Procedure — Blunt Dissection (Large-Bore)
- Position and site as above
- 3-4cm skin incision along rib; blunt dissection through intercostal muscles using Spencer-Wells forceps
- Puncture parietal pleura with finger (finger sweep to confirm no adhesions or organs)
- Insert large-bore drain; direct apically for pneumothorax, basally for fluid
- Connect to underwater seal; suture in place
- CXR
Drain Management
- Underwater seal: Water level should swing with respiration; bubbling = air leak
- Clamping: NEVER clamp a bubbling drain; may clamp briefly to assess resolution of air leak
- Removal: When drain has stopped draining (<200mL/24h), no air leak for 24h, lung fully expanded on CXR
- Removal technique: Remove during expiration or Valsalva; apply occlusive dressing
Pharmacological
- Local anaesthesia: Lidocaine 1% up to 3mg/kg (max 300mg)
- Sedation: Midazolam 1-2mg IV if anxious (monitor SpO2)
- Post-procedure analgesia: Regular paracetamol + NSAIDs; consider intercostal nerve block
Referral Criteria
- Massive haemothorax (>1500mL or >200mL/hr) — cardiothoracic surgery
- Persistent air leak >5 days — thoracic surgery
- Empyema not responding to drainage — thoracic surgery (decortication)
- Drain complications (misplacement, organ injury) — urgent surgical review
Prognosis
- Complication rate: ~10-15% overall; serious complications ~1-3%
- Re-expansion pulmonary oedema: Rare but potentially fatal; risk increases if lung collapsed for >72h; avoid draining >1.5L pleural fluid at once
- Infection: ~2% empyema rate post-drain; aseptic technique critical
- Intercostal vessel injury: More common in elderly (tortuous vessels) and low insertion sites
- Mortality directly from chest drain insertion: Rare but reported — organ injury (heart, liver, spleen, aorta)
Other Relevant Information
Chest Drain Troubleshooting
| Problem | Cause | Action |
|---|---|---|
| No swinging | Blocked, kinked, or misplaced drain | Flush, reposition, CXR |
| Continuous bubbling | Persistent air leak or connection issue | Check connections; if persistent, reassess |
| Sudden increase in drainage | New bleeding or decompressed collection | Urgent review, FBC, CXR |
| Patient deterioration after insertion | Misplacement, re-expansion oedema | CXR, clinical assessment |
| Drain falls out | Accidental displacement | Cover site with occlusive dressing, CXR, re-insert if needed |
BTS Guidelines — Key Recommendations
| Recommendation | Detail |
|---|---|
| USS guidance | For all pleural fluid drainage |
| No trocar | Banned — too dangerous |
| Safe triangle | Standard insertion site |
| Written consent | Except in emergency |
| Small-bore preferred | For most pneumothoraces and simple effusions |
| Post-procedure CXR | Mandatory |
| Never clamp bubbling drain | Risk of tension pneumothorax |