Diagnostics & Procedures · Topic 8 of 16

Chest Tubes & Needle Decompression

Procedures · pleural drainage

Chest Tubes & Needle Decompression

Decompress tension at once, place the tube in the triangle of safety, pick the size by what you are draining, and read the water seal.

Key numbers

Needle-decompress tension at 4th–5th ICS4th–5th ICS, AAL–MAL

Small-bore for air and thin fluid≤ 14 Fr

Suction −10 to −20 cm H₂O−10 to −20 cm H₂O

01 · DoNeedle-decompress tension at 4th–5th ICS

Diagnose tension pneumothorax clinically and decompress at once with a 14- or 16-gauge needle catheter (or finger thoracostomy) at the 4th–5th intercostal space between the anterior and midaxillary lines, then place a chest tube.

02 · The ruleSmall-bore for air and thin fluid

A small-bore catheter (≤ 14 Fr) is preferred for pneumothorax and free-flowing effusions and is first line for pleural infection; bloody or very thick drainage clogs it, so hemothorax traditionally gets a large-bore tube.

03 · Don't confuseBubbling water seal: air leak

Bubbling in the water-seal chamber (on expiration, cough or continuously) means an air leak. Clamp briefly at the insertion site: bubbling stops = leak in the patient; bubbling continues = system leak.

Presentation

What you'll see

Tidaling is normal; loss means re-expansion or blockageTidaling (water-seal level rising on inspiration, falling on expiration; reversed on positive-pressure ventilation) is normal. It stops when the lung has fully re-expanded or the tube is kinked or clotted; assess it off suction.

Diagnosis & monitoring

Work-up

Suction −10 to −20 cm H₂OOrdered suction is usually −10 to −20 cm H₂O; on a dry-suction unit the control dial, not the wall setting, sets the level, and off wall suction the tube stays on water seal.

Thoracotomy: > 1500 mL or > 200 mL/hAfter a chest tube for traumatic hemothorax, urgent thoracotomy is indicated for an initial drainage above 1500 mL or ongoing bleeding above 200 mL/h for 2–4 hours with hemodynamic or respiratory compromise.

Confirm position with a chest radiographGet a chest radiograph after insertion: tubes can lie in the fissure, lung parenchyma, below the diaphragm or subcutaneously. A tube whose side holes sit outside the chest must be replaced — never advanced.

Ventilated pneumothorax needs a tubePlace a chest tube for any pneumothorax in a patient on positive-pressure ventilation, and for traumatic, large, bilateral, recurrent or persistent pneumothorax, hemothorax, empyema and symptomatic large effusions.

Do right now

In this order

First moves

Needle-decompress tension at 4th–5th ICS4th–5th ICS, AAL–MAL

→

Insert in the triangle of safety

→

Confirm position with a chest radiograph

Why each step

Needle-decompress tension at 4th–5th ICSDiagnose tension pneumothorax clinically and decompress at once with a 14- or 16-gauge needle catheter (or finger thoracostomy) at the 4th–5th intercostal space between the anterior and midaxillary lines, then place a chest tube.

Insert in the triangle of safetyInsert at the 4th (air) or 5th (fluid) intercostal space between the anterior and midaxillary lines — the triangle of safety (pectoralis major, latissimus dorsi, 5th rib) — over the upper border of the rib.

Management

Orders

Prevent clogging: flush small-bore drains; avoid strippingSmall-bore catheters clog and kink: flush them with sterile saline (for example 20 mL every 6 hours) and suspect blockage when tidaling and drainage stop. Routine stripping or milking of tubing is not recommended.

Red flags & don'ts

Avoid harm

Complications: vessel, organ and re-expansion injury complicationComplications include intercostal artery bleeding (stay above the rib), liver or spleen puncture (about 0.6% of chest tubes), re-expansion pulmonary edema, subcutaneous emphysema, infection and dislodgement.

Persistent air leak beyond 3–5 days complicationAn air leak continuing after 3–5 days of drainage is a persistent air leak (often a bronchopleural fistula); refer fit patients early to thoracic surgery.

Avoid chest tubes for hepatic hydrothorax avoidNo absolute contraindication exists; relative ones are coagulopathy and infected skin at the site. Avoid chest tubes for hepatic hydrothorax — they carry high mortality from protein and fluid loss, kidney injury and infection.

The rules

Know these

Keep the drainage unit below the chestKeep the water-seal drainage unit well below the patient (about 100 cm) so fluid and air cannot flow back into the pleural space.

Remove: leak gone or drainage < 100–200 mL/dayPneumothorax: stop suction, leave on water seal, and remove once the air leak has stopped and the lung stays expanded on film. Effusion or hemothorax: remove when serous drainage falls below 100–200 mL/day.

Small-bore catheter or large-bore tube?

Commonly confused

Insertion	Seldinger over a guidewire
Best for	Pneumothorax, free-flowing effusion; first line for pleural infection
Main drawback	Clogs and kinks — flush it
Removal	No suture needed

More detail

Reference

Show 5 reference facts

Small-bore catheters go in by Seldinger technique (needle, guidewire, dilator) and cause less pain with no suture needed at removal; large tubes go in by incision, blunt dissection and a finger sweep for adhesions.

Aim the tube apically and anteriorly for air and inferoposteriorly for fluid; sit a spontaneously breathing patient 30–60° head-up with the arm above the head to keep the diaphragm low.

Remove the tube during forced exhalation (or a hum or Valsalva), seal the site with petroleum gauze, and repeat the chest radiograph a few hours later.

In large patients the decompression needle may not reach the pleura; if needle decompression fails, proceed straight to finger thoracostomy or a chest tube.

Do not clamp the chest tube for transport — the water seal protects the patient; keep the drainage unit upright and below chest level, with no dependent loops in the tubing.

Pearl

Clamp at the chest: if the bubbling stops, the leak is in the patient; if it keeps going, the leak is in the system.

Sources · Merck Manual Professional — How To Do Tube and Catheter Thoracostomy (Dezube R, rev. May 2025) · Merck Manual Professional — Pneumothorax (Rahman NM, rev. Jul 2025) · Williams JG, Lerner AD. Managing complications of pleural procedures. J Thorac Dis 2021 (PMC8411187) · Kim M, Moore JE. Chest Trauma: Current Recommendations for Rib Fractures, Pneumothorax, and Other Injuries. Curr Anesthesiol Rep 2020;10:61–68 (PMC7223697; summarizes ATLS 10th ed.) · Merck Manual Professional — Hemothorax (updated May 2026) · Iqbal B, Hallifax R, Rahman NM. Pneumothorax: an update on clinical spectrum, diagnosis and management. Clin Med (Lond) 2025;25:100327 (PMC12159893) · Teleflex — Pleur-evac Air Leak Quick Reference Guide (tidaling, air-leak assessment and clamp test; cites the AACN Procedure Manual for Critical Care), rev. 06/2023 · Shorthose M, Barton E, Walker S. The contemporary management of spontaneous pneumothorax in adults. Breathe 2024;19:230135 (PMC10790175; suction −10 to −20 cmH₂O, air leak gauged by bubbling) · Teleflex — Pleur-evac Cactus Series (dry suction, wet seal) Pocket Guide: suction dial sets negativity regardless of wall suction; keep unit below chest; do not clamp for transport · Pearce C, Crapnell A, Bedawi EO, Rahman NM, Corcoran JP. Pleural Infection: Diagnosis, Management, and Future Directions. 2025 (PMC11899816; small-bore first line, 20 mL saline flush every 6 h) · Drainology: leveraging research in chest-drain management to enhance recovery after cardiothoracic surgery. JTCVS Tech 2024 (PMC11184673; ERAS Cardiac/ESTS recommend against stripping or milking tubes) · Hepatic Hydrothorax: A Comprehensive Approach to Diagnosis and Management. GE Port J Gastroenterol 2026 (PMC13043136; conventional chest tubes should be avoided — high mortality) · Starter sheet built from the verified AGACNP fact map (facts reviewed 2026-10-15).